Simi Valley, CA Weather & Growing Conditions
Overnight
63°F
Mostly Clear
Mostly clear, with a low around 63. East northeast wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 86°F | Sunny | 0 to 10 mph SW | 0% |
| Tuesday Night | 63°F | Mostly Clear | 0 to 10 mph SE | 0% |
| Wednesday | 85°F | Sunny | 5 to 10 mph SSW | 0% |
| Wednesday Night | 64°F | Clear | 0 to 10 mph S | 0% |
| Thursday | 85°F | Sunny | 0 to 10 mph S | 0% |
| Thursday Night | 63°F | Mostly Clear | 0 to 10 mph SSE | 0% |
| Friday | 90°F | Sunny | 0 to 10 mph S | 0% |
| Friday Night | 64°F | Mostly Clear | 0 to 10 mph S | 0% |
| Saturday | 91°F | Sunny | 0 to 10 mph S | 0% |
| Saturday Night | 64°F | Clear | 0 to 10 mph SE | 0% |
| Sunday | 90°F | Sunny | 0 to 10 mph S | 0% |
| Sunday Night | 63°F | Mostly Clear | 5 to 10 mph SSE | 0% |
| Monday | 87°F | Sunny | 5 to 10 mph SSE | 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 (8.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.