San Geronimo Weather Forecast
- 56
- 86
Increasing Clouds
- 57
- 74
Chance Rain Showers
- 57
- 74
Chance Rain Showers
- 56
- 76
Mostly Sunny
- 57
- 78
Sunny
- 58
- 82
Mostly Sunny
- 58
- 75
Chance Rain Showers
Today 17 Sep Marin Coastal Range
Sunny. Highs in the upper 80s. Light Winds. Becoming west 5 to 10 Mph in the afternoon.
Tonight 17 Sep Marin Coastal Range
Partly cloudy. Lows in the upper 50s. West Winds 5 to 10 Mph.
San Geronimo Temperature Statistics
September Temperature
Novato / Gnoss Field (10.6 miles)
Lowest 1 September, 2025
51.8 °FAverage September
66.1 °FHighest 15 September, 2025
96.8 °F
Climate (2020–Present)
Novato / Gnoss Field (10.6 miles)
Average Low 2020–2025
46 °FAverage 2020–2025
57.5 °FAverage High 2020–2025
72.6 °F