South America Capitals Quiz
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Hottest Capital Cities in the World by Annual Mean Temperature
The hottest capital cities in the world are mostly found in the Sahel, the Horn of Africa, the Arabian Peninsula, and humid tropical Southeast Asia. Using annual mean temperature as the main metric, Khartoum, Niamey, and N’Djamena sit among the hottest national capitals on Earth.
Khartoum, Sudan is commonly ranked as the hottest capital city in the world by annual mean temperature, with an average near 29.9°C. The next group includes Niamey in Niger, N’Djamena in Chad, Ouagadougou in Burkina Faso, and Djibouti City in Djibouti.
How This Ranking Is Measured
This list uses annual mean temperature, not the highest recorded temperature, not summer afternoon maximums, and not heat index. Annual mean temperature averages the full year, including daytime and nighttime readings, so a city with very hot summers but cooler winters can rank below a tropical city with warm nights all year.
Best for comparing year-round heat across capitals.
Values refer to city-level climate records or nearby weather-station summaries.
Different climate-normal periods and station locations can shift close rankings.
A capital can be hotter by summer daytime maximum but lower by annual mean. Kuwait City, Doha, and Abu Dhabi have extreme summer heat, while Bangkok, Malé, Singapore, and Phnom Penh feel hot partly because warm, humid nights keep temperatures from dropping much.
Top Hottest Capital Cities
Khartoum
Sudan – about 29.9°C annual mean temperature.
Niamey
Niger – about 29.1°C annual mean temperature.
N’Djamena
Chad – about 28.9°C annual mean temperature.
| Rank | Capital City | Country | Annual Mean Temperature | Climate Setting | Region |
|---|---|---|---|---|---|
| 1 | Khartoum | Sudan | 29.9°C | Hot desert climate; very dry for much of the year | Northeast Africa |
| 2 | Niamey | Niger | 29.1°C | Desert and semi-arid transition; long hot season | West Africa / Sahel |
| 3 | N’Djamena | Chad | 28.9°C | Hot semi-arid climate; intense pre-rainy-season heat | Central Africa / Sahel |
| 4 | Ouagadougou | Burkina Faso | 28.6°C | Hot semi-arid climate; inland tropical heat | West Africa |
| 5 | Djibouti City | Djibouti | 28.6°C | Hot desert climate; low coastal desert setting | Horn of Africa |
| 6 | Abu Dhabi | United Arab Emirates | 27.9°C | Hot desert climate; Gulf coast humidity in summer | Arabian Peninsula |
| 7 | Juba | South Sudan | 27.9°C | Tropical savanna climate; hot dry season | East-Central Africa |
| 8 | Bamako | Mali | 27.8°C | Hot semi-arid climate; inland Niger River setting | West Africa |
| 9 | Phnom Penh | Cambodia | 27.8°C | Tropical savanna climate; hot and humid lowland | Southeast Asia |
| 10 | Bangkok | Thailand | 27.7°C | Tropical savanna climate; high humidity and urban heat | Southeast Asia |
| 11 | Doha | Qatar | 27.5°C | Hot desert climate; very hot summer months | Arabian Peninsula |
| 12 | Muscat | Oman | 27.3°C | Hot desert climate; coastal heat with mountain backdrop | Arabian Peninsula |
| 13 | Malé | Maldives | 27.3°C | Tropical monsoon climate; warm oceanic nights | Indian Ocean |
| 14 | Singapore | Singapore | 26.7°C | Tropical rainforest climate; little seasonal cooling | Southeast Asia |
| 15 | Kuwait City | Kuwait | 26.4°C | Hot desert climate; extreme summer but cooler winter | Arabian Peninsula |
| 16 | Jakarta | Indonesia | 26.4°C | Tropical monsoon climate; humid year-round lowland | Southeast Asia |
Table values are rounded and should be read as climate-normal comparisons, not live weather readings. Closely spaced cities can change order when a different weather station, observation period, or climate dataset is used.
Why These Capitals Are So Hot
Low Latitude
Many of these capitals sit in or near the tropics, where the sun angle stays high for much of the year. That limits winter cooling and keeps annual averages high.
Dry Inland Air
Khartoum, Niamey, N’Djamena, Ouagadougou, and Bamako sit in dry or semi-dry zones where clear skies and limited vegetation allow strong daytime heating.
Warm Nights
Tropical capitals such as Bangkok, Malé, Singapore, Jakarta, and Phnom Penh may not have the highest afternoon peaks, but warm nights keep annual means elevated.
Urban Heat
Dense buildings, roads, traffic, and reduced shade can raise city temperatures compared with surrounding rural areas, especially after sunset.
Khartoum, Niamey, and N’Djamena Compared
Khartoum ranks high because it combines desert dryness, long sunny periods, and a low-latitude position near the meeting point of the Blue Nile and White Nile. Its annual mean temperature is close to 30°C, and rainfall is low by global capital-city standards.
Niamey and N’Djamena share a Sahel setting. Both cities experience a long hot season before the rains arrive, with high average maximum temperatures in spring and early summer. Their rainy seasons bring cloud cover and humidity, but annual mean temperatures remain high because the cool season is short and mild.
Desert And Sahel Capitals
Khartoum, Niamey, N’Djamena, Ouagadougou, Djibouti City, Doha, Abu Dhabi, Muscat, and Kuwait City owe much of their heat to arid or semi-arid climates, strong sun, and limited rainfall.
Humid Tropical Capitals
Bangkok, Phnom Penh, Malé, Singapore, and Jakarta feel hot in a different way. Their averages stay high because temperatures remain warm through the night, and humidity can make outdoor heat harder to tolerate.
Common Point of Confusion
The hottest capital by annual mean temperature is not always the capital with the hottest summer afternoons. Kuwait City, Doha, Abu Dhabi, and Muscat can record extremely high summer daytime temperatures, often above the level seen in many tropical capitals. Their annual means are pulled down by cooler winter months. Tropical capitals such as Bangkok or Singapore have smaller seasonal swings, so they stay warm in every month but may not reach the same desert-summer extremes.
Which Regions Have the Hottest Capitals?
| Region | Examples | Main Heat Pattern |
|---|---|---|
| Sahel and Northeast Africa | Khartoum, Niamey, N’Djamena, Ouagadougou, Bamako | Long dry seasons, strong sun, hot inland air, short cool season |
| Horn of Africa | Djibouti City | Low elevation, desert coast, hot dry surroundings |
| Arabian Peninsula | Abu Dhabi, Doha, Muscat, Kuwait City | Desert heat, very hot summers, Gulf or coastal humidity in some cities |
| Southeast Asia and Indian Ocean | Bangkok, Phnom Penh, Jakarta, Singapore, Malé | Warm nights, humidity, monsoon influence, limited seasonal cooling |
Hottest Does Not Mean Driest
Some of the hottest capitals are dry, while others are humid and rainy. Khartoum and Doha are hot desert capitals with very low rainfall. Bangkok, Phnom Penh, Jakarta, Singapore, and Malé are hot because they sit in tropical lowlands where warm air and humid nights persist through most of the year.
This is why temperature, rainfall, and comfort should be read separately. A dry 40°C afternoon in the Sahel feels different from a humid 33°C day in Southeast Asia. Both can be stressful, but they are not the same climate experience.
Data Notes
- Annual mean temperature averages the full year and includes both daytime and nighttime conditions.
- Values are rounded to one decimal place where possible.
- Climate tables can use different normal periods, station locations, and city boundaries.
- Urban heat island effects may make dense city centers warmer than official airport or station readings.
- Capitals with close values, such as Abu Dhabi and Juba or Muscat and Malé, should be treated as near-ties rather than fixed positions.
FAQ
What is the hottest capital city in the world?
By annual mean temperature, Khartoum, Sudan is commonly listed as the hottest capital city in the world, with an average close to 29.9°C.
Is Djibouti City hotter than Khartoum?
Djibouti City is one of the hottest capitals, but city-level annual mean datasets often place Khartoum higher. Djibouti City is still notable because it combines desert heat with a low coastal setting near the Red Sea and Gulf of Aden region.
Why is Kuwait City not ranked higher?
Kuwait City has some of the harshest summer heat among capitals, but its winter is cooler than many tropical and Sahel capitals. That lowers its annual mean temperature.
Which African capitals are among the hottest?
Khartoum, Niamey, N’Djamena, Ouagadougou, Djibouti City, Juba, and Bamako are all among the hottest African capitals by annual mean temperature.
Which Asian capitals are among the hottest?
Bangkok, Phnom Penh, Doha, Abu Dhabi, Muscat, Malé, Singapore, Jakarta, and Kuwait City are among the hottest Asian capitals, depending on whether the ranking emphasizes annual mean temperature, summer maximums, or heat index.
Does humidity change the ranking?
Humidity does not change the annual mean temperature ranking, but it changes how heat feels. Bangkok, Singapore, Malé, Jakarta, and Phnom Penh can feel hotter than their temperature alone suggests because humid air slows body cooling.
