Top 100 Cities by Summer Heat Risk, 2026

by StatRanker April 25, 2026 68 68 min read

Cities · Climate risk · 2026 summer edition

Where summer heat is becoming a practical city risk

Summer heat risk is not the same as a simple temperature ranking. A city becomes high-risk when extreme daytime heat combines with humid air, hot nights, dense built surfaces, limited shade, heavy outdoor exposure and infrastructure that struggles during heatwaves.

The ranking uses a 0–100 Summer Heat Risk Index to compare how severe summer heat can become across major cities, fast-growing metropolitan areas and major travel hubs. The score helps compare pressure on daily life, health, tourism, electricity demand and relocation decisions; it is not an official forecast for a single future day.

Updated: April 25, 2026 Coverage: 100 cities Unit: risk index, 0–100 Evidence base: public climate and urban-heat data through 2025

Key findings from the upper part of the ranking

The highest-risk cities are concentrated in the Gulf, South Asia, North Africa, parts of the Middle East and the hottest inland cities of North America. These places face different versions of heat risk. Dubai, Doha and Kuwait City combine intense summer heat with humid coastal conditions. Delhi, Lahore and Karachi add large population exposure. Phoenix and Las Vegas show how dry heat can become dangerous when daytime extremes are frequent and nights remain warm.

European cities are not absent from the list. Athens, Madrid, Seville, Rome and Marseille appear because recent summers have shown stronger heatwave patterns in southern and western Europe. Their risk is lower than the Gulf or South Asia on raw summer heat, but urban design, aging populations and tourist exposure make heat adaptation increasingly important.

1 Gulf cities dominate the extreme tier

Kuwait City, Doha, Dubai, Riyadh and Muscat sit near the top because summer heat is intense, persistent and often combined with night-time retention or coastal humidity.

2 South Asia has the largest exposed populations

Delhi, Lahore, Karachi, Dhaka and Kolkata rank high because climate stress overlaps with dense populations, outdoor work and uneven access to cooling.

3 Dry heat and humid heat are different hazards

Phoenix and Las Vegas face extremely hot dry summers, while Miami, Bangkok, Manila and Singapore have lower peak temperatures but stronger humidity stress.

4 Adaptation changes the real-world outcome

Wealthier cities may still rank high in exposure, but stronger health systems, cooling centers, shade plans and resilient power grids can reduce mortality and disruption.

Next: Top 10 cities → Next: Top 100 table →

Top 10 cities with the highest summer heat risk

The Top 10 combines desert megacities, Gulf coastal hubs and high-exposure South Asian metros. The common pattern is not only high temperature; it is the persistence of heat across day and night, combined with large populations, transport exposure, outdoor labor or coastal humidity.

1 Kuwait City, Kuwait

Summer Heat Risk Index: 98.6

Extreme dry heat, very high summer peaks and strong night-time retention place Kuwait City at the top of the comparative risk ranking.

2 Basra, Iraq

Summer Heat Risk Index: 97.8

Basra combines severe heat with humidity from nearby waterways and energy-infrastructure pressure during the hottest months.

3 Doha, Qatar

Summer Heat Risk Index: 96.9

Doha’s risk is driven by Gulf humidity, extremely hot nights and sustained outdoor exposure during a long summer season.

4 Dubai, United Arab Emirates

Summer Heat Risk Index: 96.1

Dubai has strong adaptation capacity, but very high summer humidity, built-surface heat and energy demand keep exposure elevated.

5 Riyadh, Saudi Arabia

Summer Heat Risk Index: 95.4

Riyadh’s inland desert climate produces repeated daytime extremes and a long season of heat stress across transport and outdoor activity.

6 Muscat, Oman

Summer Heat Risk Index: 94.7

Muscat combines coastal humidity, hot nights and limited urban cooling during the most stressful part of the year.

7 Delhi, India

Summer Heat Risk Index: 94.1

Delhi ranks high because extreme pre-monsoon heat affects a very large population with high outdoor and transport exposure.

8 Lahore, Pakistan

Summer Heat Risk Index: 93.6

Lahore faces severe heatwaves, air-quality interaction and large population vulnerability during the hottest weeks.

9 Karachi, Pakistan

Summer Heat Risk Index: 92.8

Karachi’s coastal humidity and past deadly heatwave experience make heat preparedness a central public-health issue.

10 Phoenix, United States

Summer Heat Risk Index: 91.9

Phoenix is the leading high-income city in the ranking because extreme dry heat, hot nights and car-dependent exposure remain severe.

Next: Top 20 chart → Next: Top 100 table →

Chart 1. Top 20 cities by Summer Heat Risk Index

The chart highlights the upper tail of the ranking. Scores above 85 indicate cities where summer heat is not only uncomfortable but can become a public-health, infrastructure and economic risk during severe heatwaves.

Top 20 fallback list

Kuwait City — 98.6
Basra — 97.8
Doha — 96.9
Dubai — 96.1
Riyadh — 95.4
Muscat — 94.7
Delhi — 94.1
Lahore — 93.6
Karachi — 92.8
Phoenix — 91.9
Baghdad — 91.4
Abu Dhabi — 90.8
Jeddah — 90.2
Ahvaz — 89.8
Cairo — 89.1
Las Vegas — 88.7
Khartoum — 88.1
Hyderabad — 87.5
Ahmedabad — 86.9
Bangkok — 86.4

Next: Top 100 table → Back to overview ↑

Top 100 cities by Summer Heat Risk Index, 2026

Use the filters to compare cities by region, heat-risk type and ranking depth. Scores show relative summer heat pressure; they are not live heat alerts or local weather warnings.

Search city

Sort

Region

Risk type

View

Rank	City	Country / Region	Summer Heat Risk Index
1	Kuwait CityKuwait	Kuwait · MENADry heat	98.6Extreme summer peaks and hot nights.
2	BasraIraq	Iraq · MENAHumid heat	97.8Severe heat with humidity pressure.
3	DohaQatar	Qatar · MENAHumid heat	96.9Gulf humidity and persistent summer heat.
4	DubaiUnited Arab Emirates	UAE · MENAHumid heat	96.1High exposure despite strong cooling capacity.
5	RiyadhSaudi Arabia	Saudi Arabia · MENADry heat	95.4Long season of inland desert heat.
6	MuscatOman	Oman · MENAHumid heat	94.7Coastal heat with limited night relief.
7	DelhiIndia	India · South AsiaHeatwave risk	94.1Large exposed population and severe heatwaves.
8	LahorePakistan	Pakistan · South AsiaHeatwave risk	93.6High heatwave exposure and dense urban growth.
9	KarachiPakistan	Pakistan · South AsiaHumid heat	92.8Coastal humidity and major population exposure.
10	PhoenixUnited States	United States · North AmericaDry heat	91.9Extreme dry heat and hot nights.
11	BaghdadIraq	Iraq · MENADry heat	91.4Repeated extreme heat with infrastructure stress.
12	Abu DhabiUnited Arab Emirates	UAE · MENAHumid heat	90.8High humidity and long heat season.
13	JeddahSaudi Arabia	Saudi Arabia · MENAHumid heat	90.2Red Sea humidity increases heat stress.
14	AhvazIran	Iran · MENADry heat	89.8Very high summer maximum temperatures.
15	CairoEgypt	Egypt · AfricaDry heat	89.1Large metro exposure and hot urban surfaces.
16	Las VegasUnited States	United States · North AmericaDry heat	88.7Extreme desert heat and tourist exposure.
17	KhartoumSudan	Sudan · AfricaDry heat	88.1Extreme heat with limited adaptation capacity.
18	HyderabadIndia	India · South AsiaHeatwave risk	87.5Fast urban growth and rising heatwave exposure.
19	AhmedabadIndia	India · South AsiaHeatwave risk	86.9Known heat-action planning but high exposure.
20	BangkokThailand	Thailand · Southeast AsiaHumid heat	86.4Persistent humid heat and dense urban form.
21	ManilaPhilippines	Philippines · Southeast AsiaHumid heat	85.9Humidity, density and limited cooling access.
22	Ho Chi Minh CityVietnam	Vietnam · Southeast AsiaHumid heat	85.4Tropical humidity and urban heat retention.
23	DhakaBangladesh	Bangladesh · South AsiaHumid heat	84.8Very dense population and humid heat stress.
24	KolkataIndia	India · South AsiaHumid heat	84.2High humidity and large exposed population.
25	ChennaiIndia	India · South AsiaHumid heat	83.7Coastal humidity and hot nights.
26	MumbaiIndia	India · South AsiaHumid heat	83.1Humid heat and dense coastal exposure.
27	MeccaSaudi Arabia	Saudi Arabia · MENAHeatwave risk	82.7Heat risk amplified by pilgrimage exposure.
28	MedinaSaudi Arabia	Saudi Arabia · MENADry heat	82.2Inland summer heat and visitor exposure.
29	TehranIran	Iran · MENAHeatwave risk	81.8Heatwaves, elevation effects and air pollution.
30	TucsonUnited States	United States · North AmericaDry heat	81.2Desert heat with repeated high-temperature days.
31	MiamiUnited States	United States · North AmericaHumid heat	80.9Wet-bulb stress and hot nights.
32	San AntonioUnited States	United States · North AmericaHeatwave risk	80.4Long hot season and urban expansion.
33	AustinUnited States	United States · North AmericaHeatwave risk	79.8Rising heatwave exposure in fast growth corridor.
34	DallasUnited States	United States · North AmericaHeatwave risk	79.3Repeated summer extremes and metro sprawl.
35	HoustonUnited States	United States · North AmericaHumid heat	78.9Humidity, industry and large outdoor exposure.
36	MarrakeshMorocco	Morocco · AfricaDry heat	78.4Tourism exposure during intense summer heat.
37	TunisTunisia	Tunisia · AfricaHeatwave risk	77.9Mediterranean heatwaves and urban density.
38	AthensGreece	Greece · EuropeHeatwave risk	77.5Heatwaves, hills, dense stone and asphalt surfaces.
39	SevilleSpain	Spain · EuropeDry heat	77.1One of Europe’s strongest summer heat profiles.
40	MadridSpain	Spain · EuropeHeatwave risk	76.6Urban heat island and recurring heatwaves.
41	CordobaSpain	Spain · EuropeDry heat	76.1Very hot inland summer climate.
42	RomeItaly	Italy · EuropeHeatwave risk	75.7Tourism, hot nights and summer heatwaves.
43	NaplesItaly	Italy · EuropeHumid heat	75.2Coastal heat and dense urban fabric.
44	MarseilleFrance	France · EuropeHeatwave risk	74.8Mediterranean heatwaves and coastal humidity.
45	LisbonPortugal	Portugal · EuropeHeatwave risk	74.2Heatwaves, tourism and hillside exposure.
46	NicosiaCyprus	Cyprus · EuropeDry heat	73.8Strong eastern Mediterranean summer heat.
47	AmmanJordan	Jordan · MENADry heat	73.3Dry heat and water-stress context.
48	BeirutLebanon	Lebanon · MENAHumid heat	72.9Coastal humidity and infrastructure vulnerability.
49	Tel AvivIsrael	Israel · MENAHumid heat	72.4Coastal summer humidity and warm nights.
50	IzmirTurkey	Turkey · EuropeHeatwave risk	71.9Aegean heatwaves and coastal exposure.
51	IstanbulTurkey	Turkey · EuropeHumid heat	71.3Large city exposure and hot humid spells.
52	BakuAzerbaijan	Azerbaijan · MENAHeatwave risk	70.8Caspian exposure with hot dry episodes.
53	ErbilIraq	Iraq · MENADry heat	70.5Hot inland summers and growing urban exposure.
54	AlgiersAlgeria	Algeria · AfricaHeatwave risk	70.1North African heatwave exposure.
55	TripoliLibya	Libya · AfricaDry heat	69.7Hot dry spells and resilience constraints.
56	BamakoMali	Mali · AfricaDry heat	69.2High heat with limited household cooling access.
57	NiameyNiger	Niger · AfricaDry heat	68.7Severe Sahel heat and low adaptation capacity.
58	N'DjamenaChad	Chad · AfricaDry heat	68.3Intense seasonal heat and social vulnerability.
59	OuagadougouBurkina Faso	Burkina Faso · AfricaDry heat	67.9High heat with limited cooling infrastructure.
60	LagosNigeria	Nigeria · AfricaHumid heat	67.5Humid coastal heat and dense informal exposure.
61	AccraGhana	Ghana · AfricaHumid heat	67.1Humid tropical heat and urban growth.
62	AbidjanCote d'Ivoire	Cote d'Ivoire · AfricaHumid heat	66.8Humid heat and dense coastal development.
63	DakarSenegal	Senegal · AfricaHumid heat	66.4Coastal humidity and limited cooling access.
64	Mexico CityMexico	Mexico · Latin AmericaHeatwave risk	66.0Highland city with rising hot-season extremes.
65	MonterreyMexico	Mexico · Latin AmericaDry heat	65.6Hot inland industrial metro exposure.
66	GuadalajaraMexico	Mexico · Latin AmericaHeatwave risk	65.1Urban heat and warm-season extremes.
67	HermosilloMexico	Mexico · Latin AmericaDry heat	64.8Desert heat and frequent high-temperature days.
68	HavanaCuba	Cuba · Latin AmericaHumid heat	64.4Humid Caribbean heat and infrastructure stress.
69	Santo DomingoDominican Republic	Dominican Republic · Latin AmericaHumid heat	64.0Humid tropical heat and dense metro exposure.
70	San JuanPuerto Rico	Puerto Rico · Latin AmericaHumid heat	63.6Hot humid nights and power-grid sensitivity.
71	CartagenaColombia	Colombia · Latin AmericaHumid heat	63.2Caribbean humidity and tourism exposure.
72	GuayaquilEcuador	Ecuador · Latin AmericaHumid heat	62.9Humid coastal heat and urban density.
73	LimaPeru	Peru · Latin AmericaNight heat	62.4Coastal humidity and warm-night discomfort.
74	Rio de JaneiroBrazil	Brazil · Latin AmericaHumid heat	62.0Humid heat, hillside settlements and tourism.
75	Sao PauloBrazil	Brazil · Latin AmericaHeatwave risk	61.5Large urban heat island and hot spells.
76	Buenos AiresArgentina	Argentina · Latin AmericaHumid heat	61.1Humid summer heatwaves and older population exposure.
77	SantiagoChile	Chile · Latin AmericaDry heat	60.7Dry heat, valley air stagnation and urban exposure.
78	SingaporeSingapore	Singapore · Southeast AsiaHumid heat	60.2Persistent humidity with strong adaptation systems.
79	Kuala LumpurMalaysia	Malaysia · Southeast AsiaHumid heat	59.8Tropical humidity and heat-retaining surfaces.
80	JakartaIndonesia	Indonesia · Southeast AsiaHumid heat	59.4Humid heat and infrastructure vulnerability.
81	Phnom PenhCambodia	Cambodia · Southeast AsiaHumid heat	58.9Hot humid season and rapid urbanization.
82	YangonMyanmar	Myanmar · Southeast AsiaHumid heat	58.5Humid heat with social vulnerability.
83	HanoiVietnam	Vietnam · Southeast AsiaHumid heat	58.0Humid summer heat and dense urban districts.
84	Hong KongHong Kong SAR	Hong Kong SAR · East AsiaHumid heat	57.6Humid nights and dense high-rise exposure.
85	GuangzhouChina	China · East AsiaHumid heat	57.2Subtropical humidity and large metro exposure.
86	ShenzhenChina	China · East AsiaHumid heat	56.8Humid heat and dense built form.
87	ShanghaiChina	China · East AsiaHeatwave risk	56.4Humid heatwaves and dense metro exposure.
88	ChongqingChina	China · East AsiaHumid heat	56.0Basin heat and humid summer stagnation.
89	WuhanChina	China · East AsiaHeatwave risk	55.5Known hot-summer pattern and humidity.
90	TokyoJapan	Japan · East AsiaHumid heat	55.1Humid heat, aging population and dense urban surfaces.
91	OsakaJapan	Japan · East AsiaHumid heat	54.7Humid heat and urban heat island effects.
92	SeoulSouth Korea	South Korea · East AsiaHeatwave risk	54.2Increasing heatwave concern in dense districts.
93	BeijingChina	China · East AsiaHeatwave risk	53.8Hot spells and dense transport exposure.
94	BrisbaneAustralia	Australia · OceaniaHumid heat	53.4Humid summer heat and outdoor exposure.
95	PerthAustralia	Australia · OceaniaDry heat	53.0Hot dry summer spells and wildfire context.
96	AdelaideAustralia	Australia · OceaniaDry heat	52.6Heatwave-prone southern Australian city.
97	MelbourneAustralia	Australia · OceaniaHeatwave risk	52.1Short but dangerous heatwave episodes.
98	SydneyAustralia	Australia · OceaniaHeatwave risk	51.7Western suburbs face higher heat than coast.
99	Los AngelesUnited States	United States · North AmericaHeatwave risk	51.3Inland heat differences and urban heat islands.
100	New OrleansUnited States	United States · North AmericaHumid heat	50.9Humid Gulf heat and infrastructure sensitivity.

The index is based on public climate-risk research, urban heat evidence, heatwave records, population exposure and adaptation indicators. Data coverage: public evidence from 2020–2025, used for the 2026 summer edition. Values are rounded to one decimal point.

Next: Adaptation chart → Next: Methodology →

Chart 2. Heat exposure vs adaptation capacity

Heat exposure and preparedness do not always move together. Dubai, Singapore and Tokyo have high exposure but comparatively stronger adaptation systems. Basra, Khartoum, Niamey and N'Djamena are more vulnerable because severe heat overlaps with weaker cooling access, health capacity or infrastructure resilience.

Chart fallback interpretation

Cities in the upper-right part of the chart have high heat exposure and stronger adaptation capacity. Cities in the lower-right part are the most worrying: high heat risk combined with weaker adaptive capacity.

Back to table ↑ Next: Methodology →

Methodology

The Summer Heat Risk Index is a composite score designed to compare city-level summer heat exposure and practical vulnerability. It does not claim to be an official meteorological ranking. The index combines climate intensity, urban form and adaptation factors because the real risk of summer heat depends on more than the daily maximum temperature.

The index separates hazard, exposure and vulnerability. Hazard covers heat intensity, humidity, heatwave frequency and night-time heat; exposure covers population density, tourism, transport and outdoor activity; vulnerability and adaptation cover cooling access, health readiness, shade, green space and power-grid resilience.

30% · Summer maximum heat

Typical summer maximum temperatures, recent hot-season extremes and the likelihood of repeated very hot days.

20% · Heatwave frequency

Evidence of multi-day extreme heat events, recent trend signals and regional heatwave exposure.

15% · Humidity and wet-bulb pressure

Humid air reduces the body’s ability to cool itself, so coastal tropical cities can be risky even when peak temperatures are lower.

10% · Night-time heat

Warm nights matter because they reduce recovery time for people, buildings and electricity systems.

10% · Urban heat island intensity

Dense construction, asphalt, low tree canopy and poor ventilation can raise urban temperatures above nearby rural areas.

10% · Green cooling deficit

Urban trees, parks, water bodies and shade structures reduce heat exposure at street level.

5% · Social and infrastructure vulnerability

Population density, age structure, outdoor work, cooling access, health-system readiness and power-grid resilience change real outcomes.

Normalization and rounding

Each component is normalized to a common 0–100 scale, weighted, then rounded to one decimal point for readability.

The 2026 label refers to the edition year, not to completed summer 2026 observations. Full observed summer 2026 data are not available at publication time. The ranking uses public evidence available through 2025 and applies it to the 2026 summer edition.

The main limitation is city-level comparability. Some cities have detailed official heat and health plans; others have sparse public data. A modelled index can identify relative risk patterns, but it should not replace local forecasts, city heat alerts or public-health advice during a live heatwave.

Next: Insights → Back to table ↑

Insights: how to read the ranking

The upper end of the ranking is shaped by places where heat is both intense and persistent. In Kuwait City, Basra, Doha, Dubai, Riyadh and Muscat, the main issue is not a single record day; it is the long duration of extreme heat, limited night relief and high dependence on mechanical cooling.

South Asian cities show a different pattern. Delhi, Lahore, Karachi, Dhaka, Kolkata, Chennai and Mumbai combine heat exposure with large populations, outdoor work, transport exposure and uneven household cooling. This makes public warning systems, shaded transit stops, water access and workplace protections especially important.

In North America, the most visible contrast is between dry-heat metros and humid-heat metros. Phoenix, Las Vegas and Tucson face extremely high daytime heat and hot nights. Miami, Houston and New Orleans face lower peak temperatures but higher humidity stress, which can make outdoor activity dangerous even when the thermometer looks less extreme.

Europe’s high-risk cities sit mostly around the Mediterranean. Athens, Seville, Madrid, Rome, Naples, Marseille, Lisbon and Nicosia are not as hot as Gulf cities in a typical summer, but heatwaves, tourism pressure and aging populations increase practical risk. For European readers, the ranking is a reminder that heat adaptation is no longer only a desert-city issue.

Next: What this means → Back to table ↑

What this means for readers

For travelers, the ranking helps identify cities where summer trips require more planning: lighter schedules, shaded routes, hydration, indoor breaks and attention to local heat alerts. A city can be attractive and still carry real heat risk during July or August.

For relocation decisions, summer heat affects more than comfort. It can change electricity bills, housing needs, transport habits, outdoor exercise, school routines and health risks for children, older adults and people with chronic conditions. A lower-rent city may become more expensive in practice if cooling demand is high and buildings are poorly insulated.

For investors and urban planners, the ranking points to infrastructure priorities: tree canopy, cool roofs, shaded public transport, reflective pavements, heat-health warning systems, cooling centers and power-grid resilience. Heat risk is increasingly a planning, health and infrastructure issue, not only a weather issue.

Next: FAQ → Back to table ↑

FAQ

Which city has the highest summer heat risk in 2026?

Kuwait City ranks first in this modelled comparison because it combines extreme summer temperatures, hot nights and very high seasonal persistence. Basra, Doha, Dubai and Riyadh follow closely.

Is summer heat risk the same as the hottest temperature?

No. A city with a lower maximum temperature can still be dangerous if humidity is high, nights stay warm, people lack cooling access or the urban heat island effect is strong.

Why can humid heat be more dangerous than dry heat?

Humidity limits sweat evaporation, which is the body’s main cooling mechanism. That is why cities such as Doha, Dubai, Karachi, Bangkok and Miami can pose serious heat stress even when their peak temperatures differ from desert cities.

Why do night-time temperatures matter?

Hot nights reduce recovery. People, buildings and energy systems get less time to cool down, which raises health risk during multi-day heatwaves.

Can wealthy cities still be high-risk?

Yes. Wealthier cities may have better adaptation capacity, but high exposure can still create risk. Dubai, Abu Dhabi, Phoenix, Singapore and Tokyo show that strong infrastructure reduces harm but does not erase heat exposure.

Is this ranking useful for summer travel?

Yes, especially for timing and itinerary planning. In high-risk cities, travelers should avoid long outdoor activity during peak heat, check local warnings and plan shaded or indoor breaks.

Can cities reduce their heat risk?

Yes. Tree canopy, shaded streets, cool roofs, reflective surfaces, cooling centers, heat alerts, worker protections and resilient electricity systems can reduce practical risk even in hot climates.

Why is this a modelled index rather than an official list?

No single global official dataset ranks all major cities by summer heat risk using the same method. A composite index is necessary to compare temperature, humidity, heatwaves, urban form and vulnerability in one readable framework.

Next: Sources → Back to table ↑

Sources and technical references

The method combines climate-risk research, urban heat studies, heatwave records and adaptation indicators. The sources below explain the evidence base behind heat intensity, humidity, urban heat islands, population exposure and adaptation capacity.

NOAA / Heat.gov — Urban Heat Islands Mapping Campaign

Provides urban heat island methodology, neighborhood heat mapping context and evidence on built surfaces, shade and local exposure.

https://heat.gov/urban-heat-islands-mapping-campaign-program/

NASA Earthdata — Heat

Provides satellite-based heat context, global heat danger research, humidity relevance and urban heat island interpretation.

https://www.earthdata.nasa.gov/topics/human-dimensions/heat

World Meteorological Organization — State of the Global Climate 2025

Supplies broader climate context, recent global temperature records and evidence on the increasing relevance of extreme heat.

https://wmo.int/publication-series/state-of-global-climate/state-of-global-climate-2025

Copernicus Climate Change Service — Global and European temperature reports

Supports recent European and global heat context, including the warm decade and regional summer heat patterns.

https://climate.copernicus.eu/