Average annual temperature is 14.4 °C
Absolute maximum temperature: 39.3 °C
Absolute minimum temperature: 0.4 °C
Number of sunny days: 259 days
Number of rainy days: 106 days
Look at detailed online map of Bel Marin Keys
* Weather data for Bel Marin Keys 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) | 18.7 | 20.0 | 18.2 | 32.2 | 30.4 | 34.7 | 39.3 | 36.7 | 31.3 | 34.7 | 26.2 | 19.3 |
| Average daytime temperature (°C) | 14.3 | 14.0 | 13.9 | 19.8 | 21.3 | 23.9 | 31.1 | 30.8 | 26.4 | 26.0 | 18.8 | 15.7 |
| Average temperature (°C) | 9.8 | 8.4 | 9.1 | 12.6 | 14.6 | 16.5 | 20.5 | 21.0 | 18.2 | 17.6 | 13.1 | 11.2 |
| Average night temperature (°C) | 6.7 | 4.6 | 5.9 | 7.8 | 10.4 | 11.5 | 13.3 | 14.9 | 13.3 | 12.5 | 9.0 | 8.1 |
| Absolute minimum temperature (°C) | 0.4 | 0.5 | 1.8 | 3.5 | 7.5 | 9.0 | 11.1 | 12.1 | 10.1 | 5.5 | 2.9 | 3.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.6 |
| 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) | 5.8 | 7.6 | 7.9 | 11.3 | 11.8 | 13.0 | 13.2 | 12.3 | 10.8 | 9.1 | 7.8 | 5.6 |
| Precipitation (mm) | 351 | 79 | 285 | 13 | 43 | 2 | 0 | 0 | 4 | 15 | 66 | 181 |
| Sunny days | 12 | 16 | 8 | 26 | 22 | 29 | 31 | 28 | 25 | 24 | 21 | 17 |
| Rainy days | 19 | 12 | 23 | 4 | 9 | 1 | 0 | 3 | 5 | 7 | 9 | 14 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Bel Marin Keys during the most sunny months:
The largest precipitation sum in Bel Marin Keys is at