Simi Valley, CA Weather & Growing Conditions
Today
87°F
Sunny
Sunny, with a high near 87. West southwest wind 0 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 0 to 10 mph WSW | 0% |
| Tonight | 61°F | Mostly Clear | 0 to 10 mph WSW | 0% |
| Wednesday | 86°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 61°F | Mostly Clear | 0 to 10 mph S | 0% |
| Thursday | 86°F | Sunny | 0 to 10 mph S | 0% |
| Thursday Night | 63°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Friday | 90°F | Sunny | 0 to 10 mph SSW | 0% |
| Friday Night | 65°F | Mostly Clear | 0 to 10 mph S | 0% |
| Saturday | 91°F | Sunny | 0 to 10 mph S | 0% |
| Saturday Night | 65°F | Mostly Clear | 0 to 10 mph SSE | 0% |
| Sunday | 90°F | Sunny | 0 to 10 mph S | 0% |
| Sunday Night | 64°F | Mostly Clear | 0 to 10 mph SSE | 0% |
| Monday | 87°F | Sunny | 0 to 10 mph SSE | 1% |
| Monday Night | 62°F | Mostly Clear | 0 to 10 mph SSE | 2% |
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 Aug 4, 2026.