Average annual temperature is 10.6 °C
Absolute maximum temperature: 38.1 °C
Absolute minimum temperature: -22.1 °C
Number of sunny days: 216 days
Number of rainy days: 122 days
Number of snow days: 27 days
Look at detailed online map of Belfast
* Weather data for Belfast 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) | 5.6 | 13.4 | 18.7 | 28.7 | 30.5 | 33.4 | 36.2 | 38.1 | 35.6 | 30.0 | 18.6 | 13.8 |
| Average daytime temperature (°C) | -1.8 | 3.4 | 7.8 | 17.3 | 24.4 | 28.7 | 29.0 | 30.3 | 26.9 | 16.8 | 10.9 | 5.2 |
| Average temperature (°C) | -5.4 | -3.0 | 0.3 | 9.9 | 18.0 | 22.4 | 23.0 | 23.9 | 20.5 | 11.1 | 4.9 | 0.3 |
| Average night temperature (°C) | -8.5 | -7.5 | -4.7 | 3.6 | 12.0 | 16.5 | 17.7 | 18.6 | 14.9 | 6.2 | 0.4 | -3.1 |
| Absolute minimum temperature (°C) | -22.1 | -21.0 | -11.6 | -6.8 | 0.8 | 8.9 | 11.3 | 12.5 | 8.4 | -8.5 | -7.1 | -8.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.9 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.9 | 7.9 | 8.8 | 10.6 | 11.0 | 12.2 | 12.2 | 11.6 | 10.4 | 7.6 | 7.2 | 4.7 |
| Precipitation (mm) | 70 | 24 | 25 | 8 | 68 | 116 | 85 | 32 | 25 | 125 | 22 | 37 |
| Sunny days | 18 | 18 | 22 | 21 | 12 | 12 | 13 | 18 | 21 | 17 | 24 | 20 |
| Rainy days | 4 | 5 | 5 | 7 | 19 | 18 | 18 | 13 | 9 | 12 | 5 | 7 |
| Snow days | 9 | 5 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 4 |
The best time to visit Belfast during the most sunny months:
The largest precipitation sum in Belfast is at