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Weather & Climate in Simi Valley, CA

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Simi Valley enjoys a temperate climate with an average annual temperature of 62°F (16°C). Winters average 50°F in January while summers reach 78°F in July. The area gets 326 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 31.6 inches. The area receives 2.3 inches of snow annually. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 883 feet.

Temperature

50°F Jan (10°C) 78°F Jul (26°C)
Annual Average61.6°F
14% above US avg
January Average50°F (10°C)
July Average78°F (26°C)
Sunny Days326 days/yr

Geography

Elevation883 ft (269 m)
Area41.6 sq mi (107.6 km²)
Population Density3,027/sq mi
Coordinates34.2669°N, 118.7485°W
TimezoneAmerica/Los_Angeles
CountyLos Angeles County County
Nearest AirportBob Hope (BUR)
23 miles away

Precipitation & Snow

Annual Rainfall 31.6"
17% below US avg
Snowfall 2.3"
Wettest Month (Feb) 3.58"
Driest Month (Jun) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskVery High
Risk Score100.0 / 100
Social Vulnerability55.4 / 100
Community Resilience13.6 / 100

Hazard Breakdown

Tornado Relatively High
Hurricane No Rating
Earthquake Very High
Wildfire Very High
Flood Very High
Hail Relatively Moderate
Strong Wind Relatively Moderate
Heat Wave Relatively High
Winter Weather Relatively Moderate
Lightning Very High
Drought Relatively Low
Cold Wave Very Low
Landslide Relatively High
Coastal Flood Relatively High
Tsunami Relatively Low
Avalanche Relatively High
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

4,190 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.7.

Jan 17, 1994 Northridge, California, earthquake M6.7 20 km 18 km
Jan 17, 1994 1km ENE of Granada Hills, California M5.9 24 km 5 km
Jun 28, 1991 The 1991 Sierra Madre, California Earthquake M5.8 69 km 8 km
Jul 11, 1992 12km NW of California City, California M5.7 122 km 10 km
Jan 17, 1994 7km NNE of Simi Valley, California M5.6 8 km 9 km
Feb 28, 1990 The 1990 Upland, California Earthquake M5.5 98 km 3 km
Apr 5, 2018 31km SW of Santa Cruz Is. (E end), CA M5.3 104 km 10 km
Mar 20, 1994 3km WNW of Panorama City, California M5.2 25 km 12 km
Jan 18, 1994 10km ESE of Piru, California M5.2 13 km 11 km
Aug 7, 2024 24 km SW of Lamont, CA M5.2 99 km 12 km
Jan 17, 1994 9km N of Chatsworth, California M5.2 15 km 5 km
May 28, 1993 21km SW of Lamont, California M5.2 103 km 21 km
Mar 29, 2014 2km NW of Brea, CA M5.1 85 km 5 km
Aug 20, 2023 7 km SE of Ojai, CA M5.1 43 km 5 km
Jan 19, 1994 10km SSW of Valencia, California M5.1 17 km 11 km
Apr 26, 1997 12km ESE of Piru, California M5.1 13 km 16 km
Jan 19, 1994 8km ESE of Piru, California M5.1 13 km 14 km
Jan 29, 1994 6km NNE of Chatsworth, California M5.1 16 km 1 km
Sep 29, 2004 25km SSW of Bodfish, California M5.0 125 km 3 km
Jun 26, 1995 11km SW of Valencia, California M5.0 16 km 13 km
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Tornado History

74 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 51 injuries.

Date Rating Distance Path Fatalities
Mar 1, 1983 EF2 47 km 3.5 mi 0
Nov 9, 1982 EF2 29 km 1.0 mi 0
Nov 9, 1982 EF2 74 km 10.0 mi 0
Nov 7, 1966 EF2 58 km 0.1 mi 0
Nov 7, 1966 EF2 60 km 10.3 mi 0
Mar 22, 2023 EF1 65 km 0.5 mi 0
Jan 19, 2010 EF1 84 km 4.6 mi 0
Jan 9, 1998 EF1 76 km 1.5 mi 0
Dec 21, 1997 EF1 96 km 1.0 mi 0
Jan 14, 1993 EF1 85 km 1.0 mi 0
Dec 7, 1992 EF1 90 km 0.1 mi 0
Dec 7, 1992 EF1 91 km 0.1 mi 0
Mar 20, 1992 EF1 56 km 0.2 mi 0
Mar 27, 1991 EF1 96 km 3.0 mi 0
Mar 16, 1986 EF1 91 km 1.2 mi 0
Oct 1, 1983 EF1 53 km 0.3 mi 0
Nov 9, 1982 EF1 27 km 0.2 mi 0
Mar 29, 1982 EF1 63 km 2.0 mi 0
Jan 31, 1979 EF1 36 km 0.1 mi 0
Jan 31, 1979 EF1 99 km 2.0 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).

Tsunami History

4 tsunamis recorded within 500 km. Highest wave on record: 3.4 m (11 ft).

Year Location Cause Max Wave Deaths Distance
1812 S. CALIFORNIA Eruption + Earthquake 3.4 m 1 106 km
1930 S. CALIFORNIA Eruption + Earthquake 3.1 m 1 28 km
1994 WEST COAST, USA Earthquake 0.1 m 57 20 km
1855 S. CALIFORNIA Eruption + Earthquake - - 63 km
Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: THOMAS (281,982 acres, 2017).

Year Name Acres Burned Distance
2017 THOMAS 281,982 55 km
2007 ZACA 241,846 96 km
2009 STATION 165,368 57 km
2006 DAY 159,713 44 km
1985 WHEELER 2 126,854 62 km
2020 BOBCAT 115,728 75 km
2003 SIMI 107,756 9 km
2018 WOOLSEY 97,962 17 km
2003 PIRU 63,920 26 km
1985 FERNDALE 46,724 40 km
2016 SAND 41,561 39 km
2007 BUCKWEED 41,332 39 km
1993 GREEN MEADOWS 38,115 27 km
2002 WILLIAMS 37,505 90 km
2007 RANCH 37,009 28 km
2016 REY 33,323 96 km
2013 POWERHOUSE 32,329 52 km
2020 LAKE 30,971 50 km
2008 FREEWAY COMPLEX 29,350 100 km
1993 STECKEL 26,202 39 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 50°F (10°C) 3.5 in Coldest
February 54°F (12°C) 3.6 in Wettest
March 55°F (13°C) 2.7 in
April 59°F (15°C) 1.2 in
May 63°F (17°C) 0.2 in
June 68°F (20°C) 0.0 in
July 78°F (26°C) 0.0 in Warmest, Driest
August 75°F (24°C) 0.1 in
September 72°F (22°C) 0.2 in
October 67°F (19°C) 0.4 in
November 59°F (15°C) 2.5 in
December 54°F (12°C) 2.5 in

Simi Valley has a seasonal temperature swing of 28°F / from 50°F in January to 78°F in July. Total annual precipitation is 16.9 inches, with February being the wettest month (3.6") and July the driest (0.0").

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