Average annual temperature is 22.6 °C
Absolute maximum temperature: 37.8 °C
Absolute minimum temperature: 0.1 °C
Number of sunny days: 141 days
Number of rainy days: 224 days
Look at detailed online map of Heathrow
* Weather data for Heathrow United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 28.7 | 31.8 | 33.5 | 33.1 | 34.2 | 34.8 | 36.7 | 37.8 | 35.2 | 31.6 | 30.6 | 27.9 |
| Average daytime temperature (°C) | 23.1 | 27.4 | 28.0 | 28.8 | 29.7 | 31.7 | 33.6 | 34.3 | 31.2 | 27.9 | 24.6 | 21.4 |
| Average temperature (°C) | 16.5 | 20.1 | 21.1 | 22.8 | 23.8 | 25.9 | 27.7 | 28.4 | 25.7 | 22.8 | 19.4 | 16.8 |
| Average night temperature (°C) | 11.5 | 14.3 | 15.5 | 18.3 | 19.1 | 21.9 | 24.0 | 24.3 | 21.9 | 18.6 | 15.6 | 13.3 |
| Absolute minimum temperature (°C) | 0.1 | 6.8 | 7.2 | 12.4 | 15.0 | 19.2 | 22.1 | 22.9 | 16.9 | 10.0 | 5.9 | 5.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.2 | 12.0 | 12.9 | 13.6 | 13.9 | 13.8 | 13.2 | 12.3 | 11.5 | 10.7 | 10.3 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 8.6 | 9.3 | 10.1 | 10.0 | 11.5 | 11.3 | 11.2 | 11.4 | 10.4 | 9.0 | 7.2 | 7.0 |
| Precipitation (mm) | 43 | 15 | 48 | 177 | 110 | 275 | 208 | 128 | 244 | 90 | 135 | 101 |
| Sunny days | 23 | 20 | 16 | 6 | 13 | 2 | 0 | 4 | 8 | 18 | 16 | 15 |
| Rainy days | 8 | 8 | 15 | 24 | 18 | 28 | 31 | 27 | 22 | 13 | 14 | 16 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Heathrow is at