Simi Valley, CA Weather & Growing Conditions
Today
83°F
Sunny
Sunny, with a high near 83. West southwest wind 0 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 0 to 10 mph WSW | 0% |
| Tonight | 60°F | Mostly Cloudy | 5 mph E | 0% |
| Sunday | 81°F | Partly Sunny | 5 to 10 mph S | 1% |
| Sunday Night | 59°F | Mostly Cloudy then Patchy Fog | 0 to 5 mph SSE | 1% |
| Monday | 77°F | Patchy Fog then Mostly Sunny | 5 to 10 mph S | 1% |
| Monday Night | 57°F | Mostly Clear | 0 to 10 mph SE | 0% |
| Tuesday | 80°F | Sunny | 0 to 10 mph S | 0% |
| Tuesday Night | 60°F | Clear | 0 to 10 mph NE | 0% |
| Wednesday | 87°F | Sunny | 0 to 5 mph SSW | 0% |
| Wednesday Night | 62°F | Mostly Clear | 0 to 5 mph NNE | 0% |
| Thursday | 88°F | Sunny | 0 to 5 mph S | 0% |
| Thursday Night | 63°F | Mostly Clear | 0 to 5 mph SE | 2% |
| Friday | 86°F | Sunny | 0 to 10 mph SSE | 1% |
| Friday Night | 62°F | Mostly Clear | 0 to 10 mph NNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Simi Valley, CA
Last spring frost
Jan 8
First fall frost
Jan 1
Growing season
365 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, Newhall 5Nw, Ca (7.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.