San Anselmo, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Anselmo, a town in Marin County, California.
Overnight
54°F
Mostly Clear
Mostly clear. Low around 54, with temperatures rising to around 56 overnight. South southwest wind around 3 mph.
7-day forecast for San Anselmo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Mostly Clear | 3 mph SSW | 0% |
| Tuesday | 90°F | Haze then Sunny | 2 to 7 mph SSW | 1% |
| Tuesday Night | 55°F | Mostly Clear | 2 to 6 mph WSW | 2% |
| Wednesday | 83°F | Sunny | 2 to 6 mph SW | 2% |
| Wednesday Night | 55°F | Mostly Clear | 1 to 6 mph WSW | 0% |
| Thursday | 81°F | Sunny | 1 to 6 mph WSW | 0% |
| Thursday Night | 56°F | Mostly Clear | 1 to 6 mph WSW | 0% |
| Friday | 87°F | Sunny | 0 to 6 mph SW | 0% |
| Friday Night | 57°F | Mostly Clear | 1 to 6 mph WSW | 0% |
| Saturday | 87°F | Sunny | 1 to 6 mph SW | 0% |
| Saturday Night | 60°F | Mostly Clear | 2 to 6 mph WSW | 0% |
| Sunday | 85°F | Sunny | 2 to 8 mph WSW | 0% |
| Sunday Night | 57°F | Mostly Clear | 3 to 8 mph WSW | 0% |
| Monday | 78°F | Sunny | 3 to 8 mph SW | 0% |
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 Aug 4, 2026.