Average annual temperature is 11.0 °C
Absolute maximum temperature: 30.9 °C
Absolute minimum temperature: -4.8 °C
Number of sunny days: 130 days
Number of rainy days: 235 days
Look at detailed online map of Welwyn
* Weather data for Welwyn 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) | 12.3 | 13.4 | 14.7 | 16.9 | 20.4 | 28.8 | 26.5 | 25.3 | 30.9 | 23.0 | 14.2 | 12.8 |
| Average daytime temperature (°C) | 7.6 | 9.1 | 9.5 | 12.3 | 16.1 | 22.4 | 20.3 | 20.9 | 22.4 | 16.0 | 9.7 | 9.0 |
| Average temperature (°C) | 4.6 | 5.6 | 6.7 | 8.1 | 12.0 | 17.4 | 16.6 | 16.6 | 17.6 | 12.5 | 6.9 | 6.9 |
| Average night temperature (°C) | 1.5 | 2.4 | 3.6 | 3.9 | 7.8 | 12.0 | 12.7 | 12.5 | 13.1 | 9.4 | 4.3 | 4.4 |
| Absolute minimum temperature (°C) | -4.8 | -3.5 | -4.3 | -0.6 | 4.3 | 6.9 | 9.2 | 9.0 | 8.1 | 1.6 | -2.8 | -3.5 |
| 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 | 15.7 | 16.6 | 16.2 | 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 | 4.9 | 4.1 | 8.1 | 10.0 | 12.2 | 9.9 | 10.2 | 8.6 | 5.9 | 4.2 | 2.3 |
| Precipitation (mm) | 57 | 10 | 115 | 65 | 37 | 38 | 102 | 62 | 74 | 98 | 75 | 84 |
| Sunny days | 15 | 18 | 2 | 9 | 14 | 17 | 3 | 9 | 12 | 9 | 11 | 11 |
| Rainy days | 16 | 10 | 29 | 21 | 17 | 13 | 28 | 22 | 18 | 22 | 19 | 20 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Welwyn during the most sunny months:
Months with the longest average daylight duration in Welwyn:
The largest precipitation sum in Welwyn is at