Mill Valley, CA Weather & Growing Conditions
Today
87°F
Sunny
Sunny. High near 87, with temperatures falling to around 84 in the afternoon. Southwest wind 3 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 3 to 7 mph SW | 2% |
| Tonight | 66°F | Mostly Clear | 3 to 7 mph SW | 2% |
| Wednesday | 80°F | Sunny | 2 to 7 mph SW | 3% |
| Wednesday Night | 66°F | Partly Cloudy | 3 mph WSW | 0% |
| Thursday | 79°F | Sunny | 3 mph WSW | 0% |
| Thursday Night | 67°F | Mostly Clear | 6 mph WSW | 0% |
| Friday | 84°F | Sunny | 5 mph WSW | 0% |
| Friday Night | 67°F | Mostly Clear | 6 mph WSW | 0% |
| Saturday | 82°F | Sunny | 5 mph WSW | 0% |
| Saturday Night | 70°F | Mostly Clear | 3 to 8 mph WSW | 0% |
| Sunday | 80°F | Sunny | 5 to 8 mph WSW | 0% |
| Sunday Night | 66°F | Mostly Clear | 6 to 10 mph WSW | 0% |
| Monday | 74°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 64°F | Mostly Clear | 5 to 9 mph SW | 0% |
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 Aug 4, 2026.