Average annual temperature is 11.3 °C
Absolute maximum temperature: 30.6 °C
Absolute minimum temperature: -4.9 °C
Number of sunny days: 129 days
Number of rainy days: 236 days
Look at detailed online map of Harrow
* Weather data for Harrow United Kingdom is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 12.6 | 13.4 | 14.7 | 17.3 | 20.6 | 29.0 | 27.0 | 25.9 | 30.6 | 22.8 | 14.4 | 13.1 |
| Average daytime temperature (°C) | 7.9 | 9.5 | 10.1 | 12.8 | 16.9 | 23.0 | 20.5 | 21.1 | 22.4 | 16.4 | 10.2 | 9.4 |
| Average temperature (°C) | 4.9 | 5.8 | 7.2 | 8.5 | 12.5 | 17.8 | 16.9 | 16.9 | 17.8 | 12.8 | 7.3 | 7.3 |
| Average night temperature (°C) | 1.5 | 2.5 | 4.1 | 4.2 | 8.1 | 12.4 | 13.0 | 12.7 | 13.5 | 9.6 | 4.6 | 4.8 |
| Absolute minimum temperature (°C) | -4.9 | -2.9 | -3.6 | 0.5 | 4.9 | 7.2 | 8.9 | 9.7 | 8.1 | 2.6 | -2.4 | -3.8 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 10.0 | 12.0 | 14.0 | 16.0 | 16.0 | 16.0 | 15.0 | 13.0 | 11.0 | 9.0 | 8.0 |
| Daylight mean duration (h) | 8.4 | 10.0 | 11.9 | 13.9 | 15.6 | 16.6 | 16.1 | 14.6 | 12.7 | 10.7 | 8.9 | 7.9 |
| Daylight minimum duration (h) | 7.0 | 9.0 | 10.0 | 12.0 | 14.0 | 16.0 | 15.0 | 13.0 | 11.0 | 9.0 | 8.0 | 7.0 |
| Sunshine mean duration (h) | 4.4 | 4.5 | 4.3 | 7.9 | 10.0 | 12.4 | 10.2 | 10.0 | 9.1 | 6.4 | 4.3 | 2.4 |
| Precipitation (mm) | 66 | 12 | 106 | 82 | 42 | 30 | 111 | 72 | 59 | 103 | 90 | 90 |
| Sunny days | 14 | 17 | 4 | 9 | 15 | 17 | 3 | 5 | 14 | 11 | 9 | 11 |
| Rainy days | 17 | 11 | 27 | 21 | 16 | 13 | 28 | 26 | 16 | 20 | 21 | 20 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Harrow during the most sunny months:
Months with the longest average daylight duration in Harrow:
The largest precipitation sum in Harrow is at