Average annual temperature is 20.8 °C
Absolute maximum temperature: 36.4 °C
Absolute minimum temperature: -1.1 °C
Number of sunny days: 159 days
Number of rainy days: 206 days
Look at detailed online map of Watertown
* Weather data for Watertown 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) | 26.7 | 28.8 | 30.0 | 32.9 | 34.5 | 35.5 | 35.7 | 36.4 | 33.1 | 29.5 | 28.0 | 25.2 |
| Average daytime temperature (°C) | 20.4 | 23.9 | 24.8 | 28.2 | 28.8 | 31.5 | 33.5 | 33.4 | 30.9 | 26.2 | 21.7 | 18.5 |
| Average temperature (°C) | 13.9 | 17.3 | 18.3 | 21.2 | 22.6 | 25.4 | 27.6 | 27.7 | 24.9 | 20.5 | 16.1 | 13.3 |
| Average night temperature (°C) | 9.0 | 12.8 | 13.3 | 15.8 | 17.6 | 20.9 | 23.5 | 23.6 | 20.4 | 15.9 | 12.0 | 9.6 |
| Absolute minimum temperature (°C) | -1.1 | 2.7 | 2.5 | 9.8 | 11.7 | 16.7 | 21.5 | 21.7 | 16.1 | 8.1 | 1.6 | 0.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.4 | 11.1 | 12.0 | 12.9 | 13.7 | 14.1 | 13.9 | 13.2 | 12.3 | 11.4 | 10.6 | 10.2 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 8.1 | 8.3 | 9.3 | 9.8 | 10.9 | 10.6 | 11.1 | 11.2 | 10.4 | 9.4 | 6.8 | 6.5 |
| Precipitation (mm) | 67 | 56 | 87 | 82 | 90 | 239 | 125 | 148 | 71 | 58 | 67 | 121 |
| Sunny days | 17 | 19 | 16 | 12 | 11 | 4 | 6 | 4 | 10 | 22 | 18 | 20 |
| Rainy days | 14 | 9 | 15 | 18 | 20 | 26 | 25 | 27 | 20 | 9 | 12 | 11 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Watertown is at