Mill Valley, CA Weather & Growing Conditions
Today
59°F
Sunny
Sunny. High near 59, with temperatures falling to around 56 in the afternoon. North wind 3 to 9 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Sunny | 3 to 9 mph N | 1% |
| Tonight | 51°F | Mostly Cloudy | 8 to 14 mph NNW | 1% |
| Thursday | 62°F | Sunny | 1 to 7 mph NNW | 0% |
| Thursday Night | 51°F | Mostly Clear | 5 mph NNW | 0% |
| Friday | 63°F | Sunny | 1 to 5 mph N | 0% |
| Friday Night | 53°F | Mostly Clear | 1 to 5 mph N | 0% |
| Saturday | 66°F | Sunny | 0 to 7 mph NNE | 0% |
| Saturday Night | 54°F | Mostly Clear | 0 to 6 mph NNW | 0% |
| Sunday | 65°F | Mostly Sunny | 1 to 6 mph NNW | 0% |
| Sunday Night | 56°F | Partly Cloudy | 1 to 5 mph NW | 0% |
| Monday | 63°F | Mostly Sunny | 2 to 6 mph NW | 0% |
| Monday Night | 55°F | Partly Cloudy | 2 to 6 mph NW | 1% |
| Tuesday | 63°F | Sunny | 1 to 5 mph NNW | 2% |
| Tuesday Night | 56°F | Partly Cloudy | 1 to 5 mph W | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mill Valley, CA
Last spring frost
Jan 16
First fall frost
Dec 18
Growing season
334 days
Hardiness zone
10a
Explore more for Mill Valley, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Kentfield, Ca (3.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.