Simi Valley, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Simi Valley, a city in Ventura County, California.
Today
72°F
Mostly Sunny
Mostly sunny, with a high near 72. West wind 5 to 10 mph.
7-day forecast for Simi Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Mostly Sunny | 5 to 10 mph W | 0% |
| Tonight | 49°F | Mostly Clear | 10 mph WNW | 0% |
| Wednesday | 75°F | Sunny | 10 to 15 mph NNE | 0% |
| Wednesday Night | 52°F | Mostly Clear | 10 to 15 mph NNE | 0% |
| Thursday | 78°F | Sunny | 5 to 15 mph N | 0% |
| Thursday Night | 54°F | Mostly Clear | 10 to 15 mph N | 0% |
| Friday | 81°F | Sunny | 10 to 15 mph NNE | 0% |
| Friday Night | 59°F | Clear | 10 to 20 mph NNE | 0% |
| Saturday | 83°F | Sunny | 10 to 15 mph NNE | 0% |
| Saturday Night | 60°F | Clear | 10 to 20 mph NNE | 0% |
| Sunday | 83°F | Sunny | 5 to 10 mph NE | 0% |
| Sunday Night | 60°F | Partly Cloudy | 5 to 10 mph NNE | 0% |
| Monday | 80°F | Mostly Sunny | 5 mph E | 0% |
| Monday Night | 58°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
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 Nov 3, 2026.