Simi Valley, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Simi Valley, a city in Ventura County, California.
This Afternoon
82°F
Sunny
Sunny, with a high near 82. West southwest wind 5 to 10 mph.
7-day forecast for Simi Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 82°F | Sunny | 5 to 10 mph WSW | 0% |
| Tonight | 56°F | Mostly Clear | 5 mph NE | 0% |
| Saturday | 86°F | Sunny | 0 to 10 mph WSW | 0% |
| Saturday Night | 57°F | Mostly Cloudy then Patchy Fog | 5 mph E | 0% |
| Sunday | 84°F | Patchy Fog then Partly Sunny | 5 to 10 mph SSW | 0% |
| Sunday Night | 56°F | Partly Cloudy | 0 to 5 mph SSE | 1% |
| Monday | 80°F | Mostly Sunny | 5 to 10 mph S | 0% |
| Monday Night | 58°F | Mostly Clear | 0 to 10 mph W | 0% |
| Tuesday | 80°F | Sunny | 0 to 10 mph S | 0% |
| Tuesday Night | 61°F | Clear | 0 to 10 mph NNE | 0% |
| Wednesday | 89°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 64°F | Mostly Clear | 0 to 10 mph N | 2% |
| Thursday | 89°F | Sunny | 0 to 10 mph SSW | 1% |
| Thursday Night | 64°F | Mostly Clear | 0 to 10 mph NNE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Simi Valley (34.267, -118.748). Updated through the day.
Growing snapshot for Simi Valley
Last spring frost
Jan 24
First fall frost
Dec 15
Growing season
329 days
Hardiness zone
10a
More local growing data for Simi Valley: nearby ZIP 93065 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Camarillo
Casa Conejo
Channel Islands Beach
El Rio
Fillmore
Frazier Park
Lake of the Woods
Lake Sherwood
Meiners Oaks
Mira Monte
Moorpark
Oak Park
Oak View
Ojai
Oxnard
Piru
Port Hueneme
San Buenaventura (Ventura)
Santa Paula
Santa Rosa Valley
Saticoy
Somis
Thousand Oaks
Westlake Village
Climate data from the nearest NOAA station, Woodland Hills Pierce College, Ca (12.6 mi from Simi Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.