Average annual temperature is 16.2 °C
Absolute maximum temperature: 36.6 °C
Absolute minimum temperature: -6.3 °C
Number of sunny days: 198 days
Number of rainy days: 166 days
Number of snow days: 1 day
Look at detailed online map of Cornwall
* Weather data for Cornwall 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) | 19.5 | 25.2 | 28.8 | 30.4 | 29.4 | 32.7 | 36.5 | 35.2 | 36.6 | 28.0 | 27.7 | 20.8 |
| Average daytime temperature (°C) | 13.1 | 15.7 | 16.9 | 22.6 | 23.8 | 28.0 | 33.1 | 31.4 | 27.9 | 22.4 | 16.0 | 13.5 |
| Average temperature (°C) | 8.1 | 10.3 | 10.8 | 16.1 | 18.1 | 21.9 | 26.7 | 25.5 | 21.8 | 16.5 | 10.0 | 7.8 |
| Average night temperature (°C) | 4.5 | 6.1 | 5.9 | 10.5 | 13.3 | 16.8 | 21.7 | 20.7 | 17.0 | 11.8 | 5.3 | 3.6 |
| Absolute minimum temperature (°C) | -3.9 | -6.3 | -3.9 | 1.8 | 7.2 | 11.7 | 17.9 | 17.1 | 11.8 | 5.7 | -4.6 | -4.3 |
| 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 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.0 | 6.8 | 8.3 | 9.2 | 10.3 | 10.6 | 12.1 | 11.1 | 8.9 | 8.9 | 8.0 | 6.6 |
| Precipitation (mm) | 87 | 73 | 75 | 123 | 128 | 79 | 66 | 51 | 92 | 43 | 64 | 150 |
| Sunny days | 14 | 15 | 15 | 14 | 14 | 15 | 13 | 15 | 16 | 23 | 25 | 19 |
| Rainy days | 16 | 13 | 16 | 16 | 17 | 15 | 18 | 16 | 14 | 8 | 5 | 12 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Cornwall during the most sunny months:
The largest precipitation sum in Cornwall is at