Average annual temperature is 16.4 °C
Absolute maximum temperature: 40.4 °C
Absolute minimum temperature: -7.6 °C
Number of sunny days: 306 days
Number of rainy days: 53 days
Number of snow days: 6 days
Look at detailed online map of Swansea
* Weather data for Swansea 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) | 12.2 | 16.8 | 16.9 | 29.1 | 31.1 | 34.8 | 40.4 | 34.9 | 33.4 | 29.4 | 24.7 | 19.6 |
| Average daytime temperature (°C) | 8.4 | 10.2 | 10.4 | 20.3 | 25.7 | 27.9 | 36.7 | 30.9 | 28.6 | 24.1 | 16.9 | 14.1 |
| Average temperature (°C) | 3.8 | 5.1 | 6.0 | 14.7 | 20.3 | 22.8 | 31.4 | 26.4 | 23.6 | 19.0 | 12.4 | 10.5 |
| Average night temperature (°C) | 0.3 | 1.1 | 1.9 | 10.6 | 15.7 | 18.0 | 26.8 | 21.9 | 19.4 | 14.1 | 7.7 | 6.7 |
| Absolute minimum temperature (°C) | -7.6 | -6.2 | -5.9 | -4.6 | 4.2 | 12.8 | 23.1 | 15.1 | 13.4 | 2.4 | 1.1 | -0.8 |
| 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 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.2 | 8.9 | 9.5 | 12.1 | 13.0 | 13.2 | 13.3 | 12.0 | 11.3 | 10.3 | 9.1 | 8.0 |
| Precipitation (mm) | 165 | 84 | 206 | 0 | 0 | 5 | 1 | 83 | 2 | 3 | 11 | 6 |
| Sunny days | 16 | 19 | 15 | 30 | 30 | 26 | 30 | 28 | 28 | 29 | 27 | 28 |
| Rainy days | 14 | 6 | 14 | 0 | 1 | 4 | 1 | 3 | 2 | 2 | 3 | 3 |
| Snow days | 1 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Swansea is at