Fairfax, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairfax, a town in Marin County, California.
Overnight
53°F
Patchy Fog
Patchy fog after 4am. Mostly clear, with a low around 53. West wind around 3 mph.
7-day forecast for Fairfax
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Patchy Fog | 3 mph W | 0% |
| Saturday | 83°F | Patchy Fog then Sunny | 0 to 8 mph SW | 0% |
| Saturday Night | 53°F | Partly Cloudy then Patchy Fog | 2 to 8 mph W | 0% |
| Sunday | 74°F | Patchy Fog then Mostly Cloudy | 1 to 7 mph WSW | 1% |
| Sunday Night | 53°F | Mostly Cloudy then Patchy Fog | 1 to 7 mph WSW | 1% |
| Monday | 74°F | Patchy Fog then Mostly Sunny | 1 to 8 mph WSW | 0% |
| Monday Night | 54°F | Partly Cloudy | 1 to 8 mph SW | 1% |
| Tuesday | 77°F | Patchy Fog then Mostly Sunny | 1 to 6 mph SW | 0% |
| Tuesday Night | 53°F | Mostly Clear | 0 to 6 mph W | 0% |
| Wednesday | 88°F | Patchy Fog then Sunny | 0 to 5 mph ENE | 0% |
| Wednesday Night | 58°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Thursday | 88°F | Sunny | 0 to 6 mph W | 0% |
| Thursday Night | 57°F | Mostly Clear | 2 to 6 mph W | 0% |
| Friday | 81°F | Mostly Sunny | 2 to 7 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Fairfax (37.989, -122.595). Updated through the day.
Growing snapshot for Fairfax
Last spring frost
Jan 11
First fall frost
Dec 21
Growing season
349 days
Hardiness zone
9b
More local growing data for Fairfax: 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 Fairfax). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.