Mill Valley, CA Weather & Growing Conditions
This Afternoon
76°F
Sunny
Sunny. High near 76, with temperatures falling to around 69 in the afternoon. West northwest wind 3 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Sunny | 3 to 7 mph WNW | 0% |
| Tonight | 57°F | Partly Cloudy | 9 mph WNW | 1% |
| Sunday | 66°F | Partly Sunny | 3 to 8 mph WNW | 0% |
| Sunday Night | 57°F | Mostly Cloudy | 5 to 8 mph W | 0% |
| Monday | 65°F | Mostly Sunny | 7 mph WSW | 2% |
| Monday Night | 56°F | Partly Cloudy | 5 to 8 mph WSW | 2% |
| Tuesday | 68°F | Mostly Sunny | 2 to 6 mph WSW | 0% |
| Tuesday Night | 58°F | Mostly Clear | 3 mph WSW | 0% |
| Wednesday | 81°F | Sunny | 2 mph SW | 0% |
| Wednesday Night | 66°F | Mostly Clear | 3 mph WSW | 0% |
| Thursday | 82°F | Sunny | 3 mph W | 0% |
| Thursday Night | 66°F | Mostly Clear | 3 to 7 mph W | 0% |
| Friday | 76°F | Sunny | 3 to 7 mph W | 0% |
| Friday Night | 62°F | Mostly Clear | 5 to 8 mph W | 1% |
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 Sep 19, 2026.