Summer heat varies widely around the world. This ranking compares the average daily high temperature in the three meteorological summer months for each of our flagship cities with historical climate data. The top 20 below link to full city climate guides, where you can explore monthly temperature, rainfall, sunshine, wind, and snow averages.
| # | City | Average summer high (°C / °F) |
|---|---|---|
| 1 | Dubai UAE | 42.7°C / 108.3°F |
| 2 | Cairo Egypt | 37.7°C / 99.3°F |
| 3 | Delhi India | 35.0°C / 95.0°F |
| 4 | Madrid Spain | 32.3°C / 90.3°F |
| 5 | Bangkok Thailand | 32.3°C / 89.7°F |
| 6 | Athens Greece | 32.0°C / 89.7°F |
| 7 | Rome Italy | 31.7°C / 88.7°F |
| 8 | Beijing China | 31.7°C / 88.7°F |
| 9 | Miami United States | 30.7°C / 86.3°F |
| 10 | Shanghai China | 30.7°C / 87.0°F |
| 11 | Cancún Mexico | 30.7°C / 87.3°F |
| 12 | Los Angeles United States | 30.3°C / 87.0°F |
| 13 | Rio de Janeiro Brazil | 29.7°C / 85.7°F |
| 14 | Hong Kong China | 29.7°C / 85.7°F |
| 15 | Jakarta Indonesia | 29.7°C / 85.7°F |
| 16 | Singapore Singapore | 29.0°C / 84.3°F |
| 17 | Tokyo Japan | 29.0°C / 84.3°F |
| 18 | Mumbai India | 28.7°C / 83.3°F |
| 19 | Seoul South Korea | 28.3°C / 83.3°F |
| 20 | Istanbul Türkiye | 28.0°C / 82.7°F |
How we ranked the cities
For cities in the Northern Hemisphere, summer means June through August; for cities in the Southern Hemisphere, it means December through February. We averaged the monthly mean daily highs across those three months using each city's 2015–2024 climate averages, the same ten-year historical summaries that power our city climate guides. This consistent seasonal definition makes the comparison meaningful across hemispheres.
These are long-term climate averages, not a forecast or a record of a single heatwave. Local elevation, geography, and the urban heat island effect all influence a city's temperatures. Visit a city climate guide for its full month-by-month context.