Fairfax, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairfax, a town in Marin County, California.
Today
62°F
Light Rain
Rain. Mostly cloudy. High near 62, with temperatures falling to around 56 in the afternoon. South southwest wind 3 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 Fairfax
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Light Rain | 3 to 10 mph SSW | 93% |
| Tonight | 48°F | Chance Light Rain then Mostly Cloudy | 3 to 8 mph ENE | 46% |
| Wednesday | 66°F | Sunny | 2 to 9 mph NNW | 2% |
| Wednesday Night | 48°F | Partly Cloudy | 2 to 9 mph NW | 0% |
| Thursday | 71°F | Sunny | 3 mph NW | 0% |
| Thursday Night | 48°F | Mostly Clear | 1 to 5 mph NW | 0% |
| Friday | 73°F | Sunny | 2 mph N | 0% |
| Friday Night | 50°F | Mostly Clear | 2 mph NNW | 0% |
| Saturday | 74°F | Sunny | 0 to 5 mph NNE | 0% |
| Saturday Night | 50°F | Mostly Clear | 3 mph NW | 0% |
| Sunday | 74°F | Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 2 mph WNW | 0% |
| Monday | 71°F | Partly Sunny | 5 mph WNW | 2% |
| Monday Night | 50°F | Partly Cloudy | 5 mph NW | 2% |
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 Nov 3, 2026.