Average annual temperature is 10.6 °C
Absolute maximum temperature: 33.5 °C
Absolute minimum temperature: -23.9 °C
Number of sunny days: 162 days
Number of rainy days: 192 days
Number of snow days: 11 days
Look at detailed online map of Mill Valley
* Weather data for Mill Valley 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) | 10.5 | 13.9 | 15.4 | 32.7 | 30.4 | 33.3 | 32.0 | 29.3 | 33.5 | 27.2 | 18.8 | 15.4 |
| Average daytime temperature (°C) | 5.3 | 5.7 | 8.2 | 17.0 | 21.2 | 24.7 | 27.9 | 25.6 | 23.0 | 18.2 | 8.6 | 7.2 |
| Average temperature (°C) | 1.4 | -0.1 | 2.7 | 10.2 | 14.3 | 18.5 | 22.7 | 20.4 | 17.9 | 12.7 | 3.4 | 2.7 |
| Average night temperature (°C) | -1.8 | -4.9 | -1.9 | 4.9 | 7.8 | 13.4 | 18.5 | 16.1 | 13.9 | 8.6 | -0.5 | -0.4 |
| Absolute minimum temperature (°C) | -7.1 | -23.9 | -6.7 | -3.5 | 1.5 | 7.0 | 12.8 | 11.0 | 6.5 | 1.9 | -5.7 | -6.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.6 | 11.9 | 13.4 | 14.6 | 15.2 | 14.9 | 13.9 | 12.5 | 11.1 | 9.8 | 9.1 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.0 | 6.3 | 7.6 | 8.3 | 11.8 | 9.9 | 10.2 | 9.5 | 7.7 | 7.2 | 7.1 | 4.7 |
| Precipitation (mm) | 165 | 53 | 108 | 126 | 61 | 115 | 231 | 162 | 233 | 92 | 51 | 183 |
| Sunny days | 10 | 12 | 13 | 14 | 21 | 7 | 6 | 10 | 15 | 17 | 22 | 15 |
| Rainy days | 18 | 13 | 15 | 16 | 10 | 23 | 25 | 21 | 15 | 14 | 7 | 15 |
| Snow days | 3 | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Mill Valley during the most sunny months:
The largest precipitation sum in Mill Valley is at