Simi Valley, CA Weather & Growing Conditions
Tonight
51°F
Clear
Clear, with a low around 51. North northeast wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Clear | 5 to 10 mph NNE | 0% |
| Wednesday | 75°F | Sunny | 5 to 10 mph N | 0% |
| Wednesday Night | 54°F | Partly Cloudy | 5 to 15 mph N | 0% |
| Thursday | 79°F | Mostly Sunny | 5 to 15 mph NNE | 0% |
| Thursday Night | 59°F | Mostly Clear | 5 to 15 mph NNE | 0% |
| Friday | 82°F | Sunny | 15 mph NNE | 0% |
| Friday Night | 60°F | Clear | 10 to 20 mph NNE | 0% |
| Saturday | 83°F | Sunny | 10 to 15 mph NNE | 0% |
| Saturday Night | 60°F | Mostly Clear | 10 to 15 mph NNE | 0% |
| Sunday | 83°F | Sunny | 5 to 10 mph NNE | 0% |
| Sunday Night | 60°F | Mostly Clear | 5 to 15 mph NNE | 0% |
| Monday | 82°F | Sunny | 5 mph N | 0% |
| Monday Night | 59°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Tuesday | 80°F | Sunny | 0 to 5 mph SE | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Simi Valley, CA
Last spring frost
Jan 24
First fall frost
Dec 15
Growing season
329 days
Hardiness zone
10a
Explore more for Simi Valley, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Woodland Hills Pierce College, Ca (12.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.