Average annual temperature is 14.6 °C
Absolute maximum temperature: 37.5 °C
Absolute minimum temperature: -11.5 °C
Number of sunny days: 199 days
Number of rainy days: 162 days
Number of snow days: 4 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) | 19.9 | 20.9 | 22.7 | 28.4 | 31.6 | 35.1 | 37.2 | 37.5 | 32.6 | 29.9 | 26.6 | 17.7 |
| Average daytime temperature (°C) | 8.2 | 11.3 | 13.0 | 20.7 | 25.9 | 30.2 | 31.7 | 29.8 | 27.2 | 20.5 | 14.1 | 10.0 |
| Average temperature (°C) | 3.6 | 5.3 | 6.9 | 13.8 | 19.5 | 23.8 | 25.9 | 24.7 | 21.5 | 15.3 | 8.6 | 5.6 |
| Average night temperature (°C) | 0.3 | 0.9 | 2.3 | 8.2 | 14.1 | 18.0 | 21.2 | 20.7 | 16.8 | 11.2 | 4.3 | 2.6 |
| Absolute minimum temperature (°C) | -11.5 | -10.2 | -6.6 | 0.9 | 6.2 | 12.4 | 17.5 | 13.9 | 11.6 | -1.7 | -5.0 | -5.9 |
| 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 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.6 | 13.6 | 12.4 | 11.2 | 10.1 | 9.5 |
| 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) | 5.1 | 7.3 | 6.7 | 10.1 | 10.5 | 12.4 | 11.5 | 9.8 | 10.2 | 7.7 | 7.6 | 5.6 |
| Precipitation (mm) | 67 | 76 | 218 | 68 | 140 | 70 | 76 | 136 | 59 | 64 | 18 | 92 |
| Sunny days | 15 | 17 | 13 | 19 | 15 | 18 | 11 | 14 | 17 | 18 | 24 | 18 |
| Rainy days | 14 | 10 | 17 | 11 | 16 | 12 | 20 | 17 | 13 | 13 | 6 | 13 |
| Snow days | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Swansea during the most sunny months:
The largest precipitation sum in Swansea is at