San Anselmo, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Anselmo, a town in Marin County, California.
Today
60°F
Light Rain
Rain. Mostly cloudy. High near 60, with temperatures falling to around 56 in the afternoon. South southwest wind 2 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for San Anselmo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 60°F | Light Rain | 2 to 10 mph SSW | 92% |
| Tonight | 49°F | Chance Light Rain then Mostly Cloudy | 5 to 9 mph ENE | 45% |
| Wednesday | 64°F | Sunny | 2 to 9 mph N | 3% |
| Wednesday Night | 49°F | Partly Cloudy | 3 to 10 mph NW | 0% |
| Thursday | 69°F | Sunny | 3 mph NNW | 0% |
| Thursday Night | 49°F | Mostly Clear | 1 to 5 mph NW | 0% |
| Friday | 71°F | Sunny | 1 mph N | 0% |
| Friday Night | 51°F | Mostly Clear | 2 mph NNW | 0% |
| Saturday | 75°F | Sunny | 0 to 3 mph NE | 0% |
| Saturday Night | 52°F | Mostly Clear | 3 mph NW | 0% |
| Sunday | 74°F | Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 52°F | Partly Cloudy | 2 mph WNW | 0% |
| Monday | 71°F | Partly Sunny | 3 mph WNW | 2% |
| Monday Night | 51°F | Partly Cloudy | 3 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for San Anselmo (37.982, -122.570). Updated through the day.
Growing snapshot for San Anselmo
Last spring frost
Jan 11
First fall frost
Dec 21
Growing season
349 days
Hardiness zone
9b
More local growing data for San Anselmo: nearby ZIP 94960 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, San Rafael Civic Ctr, Ca (2.2 mi from San Anselmo). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.