Historical Weather in Simi Valley, CA
See 55+ years of weather history for any date in Simi Valley going back to 1970.
Part of California weather history
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Today in Simi Valley Weather HistorySee records, averages, and 55+ years of data for today's date
→Monthly Climate Averages
Historical temperature and precipitation averages for Simi Valley, CA, based on 55+ years of weather data.
Warmest MonthAugustAvg High: 88°F / Low: 62°F
Coldest MonthDecemberAvg High: 64°F / Low: 48°F
Jan
65°/ 49°
Feb
64°/ 47°
Mar
68°/ 48°
Apr
70°/ 49°
May
76°/ 54°
Jun
80°/ 56°
Jul
87°/ 61°
Aug
88°/ 62°
Sep
85°/ 61°
Oct
79°/ 57°
Nov
71°/ 53°
Dec
64°/ 48°
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Simi Valley Temperature Records
- Record High: The hottest temperature ever recorded in Simi Valley, CA is 120°F, set on September 6, 2020.
- Record Low: The coldest temperature ever recorded in Simi Valley, CA is 18°F, set on February 6, 1989.
- Data Coverage: Based on 32 years of data from NOAA weather station: CHEESEBORO CALIFORNIA.
All-Time Record High
120°F
September 6, 2020
All-Time Record Low
18°F
February 6, 1989
Monthly Temperature Records in Simi Valley
| Month | Record High | Record Low |
|---|---|---|
| January | 93°F(1975) | 20°F(2007) |
| February | 94°F(1986) | 18°F(1989) |
| March | 101°F(1988) | 28°F(1976) |
| April | 105°F(1989) | 30°F(1999) |
| May | 113°F(1984) | 37°F(1974) |
| June | 113°F(1990) | 40°F(1971) |
| July | 119°F(2006) | 45°F(2018) |
| August | 116°F(1985) | 45°F(1995) |
| September | 120°F(2020) | 42°F(1971) |
| October | 113°F(2024) | 27°F(1971) |
| November | 101°F(2006) | 24°F(2004) |
| December | 93°F(1975) | 20°F(1990) |
Simi Valley Snow RecordsSee the top 10 snowiest days ever recorded
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