Lagunitas-Forest Knolls, CA Weather & Growing Conditions
Tonight
54°F
Mostly Cloudy
Mostly cloudy, with a low around 54. West northwest wind 5 to 8 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Mostly Cloudy | 5 to 8 mph WNW | 1% |
| Sunday | 68°F | Partly Sunny | 5 to 9 mph WNW | 0% |
| Sunday Night | 54°F | Mostly Cloudy then Patchy Fog | 2 to 7 mph W | 0% |
| Monday | 67°F | Patchy Fog then Mostly Sunny | 2 to 8 mph W | 1% |
| Monday Night | 54°F | Mostly Cloudy then Patchy Fog | 1 to 8 mph W | 1% |
| Tuesday | 69°F | Areas Of Fog then Mostly Sunny | 1 to 8 mph W | 0% |
| Tuesday Night | 53°F | Mostly Clear then Patchy Fog | 2 to 8 mph NW | 0% |
| Wednesday | 77°F | Areas Of Fog then Mostly Sunny | 2 to 8 mph NW | 0% |
| Wednesday Night | 58°F | Partly Cloudy | 1 to 8 mph NW | 0% |
| Thursday | 79°F | Mostly Sunny | 1 to 8 mph NW | 0% |
| Thursday Night | 58°F | Partly Cloudy | 5 to 8 mph WNW | 0% |
| Friday | 73°F | Mostly Sunny | 5 to 9 mph WNW | 0% |
| Friday Night | 56°F | Partly Cloudy | 5 to 9 mph WNW | 1% |
| Saturday | 67°F | Mostly Sunny | 5 to 8 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lagunitas-Forest Knolls, CA
Last spring frost
Jan 11
First fall frost
Dec 21
Growing season
349 days
Hardiness zone
9b
Explore more for Lagunitas-Forest Knolls, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, San Rafael Civic Ctr, Ca (12.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.