Average annual temperature is 21.6 °C
Absolute maximum temperature: 48.2 °C
Absolute minimum temperature: -0.2 °C
Number of sunny days: 315 days
Number of rainy days: 50 days
Look at detailed online map of Belfast (historical)
* Weather data for Belfast (historical) 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) | 18.8 | 24.7 | 25.2 | 38.3 | 39.4 | 41.7 | 48.2 | 44.7 | 41.7 | 36.2 | 29.0 | 21.3 |
| Average daytime temperature (°C) | 15.0 | 17.9 | 19.5 | 29.4 | 33.5 | 35.9 | 44.3 | 40.0 | 35.9 | 30.0 | 20.8 | 17.4 |
| Average temperature (°C) | 9.8 | 11.4 | 13.0 | 21.8 | 25.7 | 28.2 | 37.1 | 33.1 | 28.5 | 22.7 | 14.7 | 12.0 |
| Average night temperature (°C) | 5.1 | 5.4 | 7.6 | 14.6 | 18.5 | 21.1 | 29.1 | 26.0 | 21.8 | 15.9 | 9.0 | 6.9 |
| Absolute minimum temperature (°C) | -0.2 | 0.8 | 3.1 | 4.4 | 11.2 | 16.8 | 24.1 | 21.1 | 15.9 | 7.1 | 4.5 | 2.5 |
| 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 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.2 | 13.4 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.4 | 9.0 | 9.2 | 11.9 | 12.9 | 13.1 | 13.1 | 11.4 | 10.7 | 10.3 | 9.0 | 8.3 |
| Precipitation (mm) | 45 | 8 | 41 | 0 | 0 | 1 | 0 | 31 | 23 | 0 | 6 | 3 |
| Sunny days | 19 | 21 | 19 | 30 | 28 | 27 | 31 | 28 | 26 | 30 | 28 | 28 |
| Rainy days | 12 | 7 | 12 | 0 | 3 | 3 | 0 | 3 | 4 | 1 | 2 | 3 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Belfast (historical) is at