Simi Valley, CA Weather & Growing Conditions
Today
73°F
Sunny
Sunny, with a high near 73. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Sunny | 5 to 15 mph NNE | 0% |
| Tonight | 54°F | Partly Cloudy | 15 to 20 mph NNE | 0% |
| Thursday | 76°F | Mostly Sunny | 10 to 15 mph NNE | 0% |
| Thursday Night | 57°F | Mostly Clear | 10 to 20 mph NNE | 0% |
| Friday | 79°F | Sunny | 10 to 20 mph NNE | 0% |
| Friday Night | 59°F | Clear | 10 to 20 mph NNE | 0% |
| Saturday | 80°F | Sunny | 10 to 15 mph NNE | 0% |
| Saturday Night | 59°F | Clear | 10 to 20 mph NNE | 0% |
| Sunday | 80°F | Sunny | 5 to 15 mph NNE | 0% |
| Sunday Night | 59°F | Mostly Clear | 5 to 15 mph NNE | 0% |
| Monday | 79°F | Sunny | 5 to 10 mph NE | 0% |
| Monday Night | 58°F | Partly Cloudy | 0 to 5 mph NNW | 1% |
| Tuesday | 77°F | Sunny | 5 mph E | 1% |
| Tuesday Night | 57°F | Mostly Clear | 0 to 5 mph NNW | 5% |
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 Nov 4, 2026.