Simi Valley, CA Weather & Growing Conditions
Today
82°F
Sunny
Sunny, with a high near 82. West southwest wind 0 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Sunny | 0 to 10 mph WSW | 0% |
| Tonight | 59°F | Mostly Cloudy then Patchy Fog | 5 mph E | 0% |
| Sunday | 79°F | Patchy Fog then Partly Sunny | 5 to 10 mph S | 1% |
| Sunday Night | 58°F | Mostly Cloudy then Patchy Fog | 5 mph SSE | 1% |
| Monday | 75°F | Patchy Fog then Mostly Sunny | 5 to 10 mph S | 0% |
| Monday Night | 57°F | Partly Cloudy | 5 to 10 mph SSW | 0% |
| Tuesday | 77°F | Sunny | 0 to 10 mph S | 0% |
| Tuesday Night | 59°F | Clear | 0 to 10 mph ENE | 0% |
| Wednesday | 85°F | Sunny | 0 to 10 mph SSW | 0% |
| Wednesday Night | 61°F | Mostly Clear | 0 to 10 mph N | 0% |
| Thursday | 86°F | Sunny | 0 to 5 mph S | 0% |
| Thursday Night | 61°F | Mostly Clear | 0 to 5 mph SE | 2% |
| Friday | 85°F | Sunny | 0 to 10 mph SSE | 1% |
| Friday Night | 62°F | Mostly Clear | 5 to 10 mph NW | 0% |
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 Sep 19, 2026.