Weather & Climate in Somis, CA

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

Somis enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 57°F in January while summers reach 69°F in July / relatively mild seasonal variation. Annual precipitation totals 12.0 inches (drier than the 38-inch national average). Air quality is rated Moderate with a median AQI of 80 / residents may notice occasional air quality concerns. 10% of days have good air quality. The city sits at an elevation of 344 feet.

Temperature

57°F Jan (14°C) 69°F Jul (21°C)
Annual Average62.5°F
16% above US avg
January Average57°F (14°C)
July Average69°F (21°C)

Geography

Elevation344 ft (105 m)
Area3.4 sq mi (8.7 km²)
Population Density376/sq mi
Coordinates34.2653°N, 118.9984°W
TimezoneAmerica/Los_Angeles
CountyLos Angeles County County
Nearest AirportBob Hope (BUR)
37 miles away

Precipitation & Snow

Annual Rainfall 12.0"
68% below US avg
Snowfall 0.0"
Wettest Month (Feb) 2.90"
Driest Month (Jul) 0.02"

Air Quality

AQI Median80.0
RatingModerate
Good Days %10.4%
Unhealthy Days133

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

3,789 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.7.

Jan 17, 1994 Northridge, California, earthquake M6.7 43 km 18 km
Jan 17, 1994 1km ENE of Granada Hills, California M5.9 47 km 5 km
Jun 28, 1991 The 1991 Sierra Madre, California Earthquake M5.8 92 km 8 km
Jul 11, 1992 12km NW of California City, California M5.7 135 km 10 km
Jan 17, 1994 7km NNE of Simi Valley, California M5.6 28 km 9 km
Feb 28, 1990 The 1990 Upland, California Earthquake M5.5 120 km 3 km
Apr 5, 2018 31km SW of Santa Cruz Is. (E end), CA M5.3 84 km 10 km
Jan 18, 1994 10km ESE of Piru, California M5.2 30 km 11 km
Mar 20, 1994 3km WNW of Panorama City, California M5.2 48 km 12 km
Aug 7, 2024 24 km SW of Lamont, CA M5.2 94 km 12 km
Jan 17, 1994 9km N of Chatsworth, California M5.2 36 km 5 km
May 28, 1993 21km SW of Lamont, California M5.2 99 km 21 km
Mar 29, 2014 2km NW of Brea, CA M5.1 106 km 5 km
Aug 20, 2023 7 km SE of Ojai, CA M5.1 24 km 5 km
Jan 19, 1994 10km SSW of Valencia, California M5.1 37 km 11 km
Apr 26, 1997 12km ESE of Piru, California M5.1 32 km 16 km
Jan 29, 1994 6km NNE of Chatsworth, California M5.1 39 km 1 km
Jan 19, 1994 8km ESE of Piru, California M5.1 29 km 14 km
Sep 29, 2004 25km SSW of Bodfish, California M5.0 130 km 3 km
Jun 26, 1995 11km SW of Valencia, California M5.0 34 km 13 km
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Tornado History

53 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 47 injuries.

Date Rating Distance Path Fatalities
Mar 1, 1983 EF2 66 km 3.5 mi 0
Nov 9, 1982 EF2 91 km 10.0 mi 0
Nov 9, 1982 EF2 51 km 1.0 mi 0
Nov 7, 1966 EF2 77 km 10.3 mi 0
Nov 7, 1966 EF2 76 km 0.1 mi 0
Mar 22, 2023 EF1 86 km 0.5 mi 0
Jan 9, 1998 EF1 94 km 1.5 mi 0
Mar 20, 1992 EF1 78 km 0.2 mi 0
Oct 1, 1983 EF1 71 km 0.3 mi 0
Nov 9, 1982 EF1 39 km 0.2 mi 0
Mar 29, 1982 EF1 85 km 2.0 mi 0
Jan 31, 1979 EF1 59 km 0.1 mi 0
May 8, 1977 EF1 91 km 0.1 mi 0
Jan 3, 1977 EF1 78 km 0.1 mi 0
Nov 9, 1964 EF1 65 km 1.0 mi 0
May 14, 1962 EF1 78 km 0.1 mi 0
Jan 18, 1955 EF1 69 km 3.0 mi 0
May 4, 2023 EF0 80 km 0.1 mi 0
May 4, 2023 EF0 84 km 0.7 mi 0
Mar 21, 2023 EF0 52 km 0.2 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 83 km
1930 S. CALIFORNIA Eruption + Earthquake 3.1 m 1 42 km
1994 WEST COAST, USA Earthquake 0.1 m 57 43 km
1855 S. CALIFORNIA Eruption + Earthquake - - 85 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 35 km
2007 ZACA 241,846 77 km
2009 STATION 165,368 80 km
2006 DAY 159,713 39 km
1985 WHEELER 2 126,854 43 km
2020 BOBCAT 115,728 98 km
2003 SIMI 107,756 21 km
2018 WOOLSEY 97,962 22 km
2003 PIRU 63,920 27 km
1985 FERNDALE 46,724 22 km
2016 SAND 41,561 61 km
2007 BUCKWEED 41,332 58 km
1993 GREEN MEADOWS 38,115 17 km
2007 RANCH 37,009 37 km
2016 REY 33,323 76 km
2013 POWERHOUSE 32,329 67 km
2020 LAKE 30,971 62 km
1993 STECKEL 26,202 19 km
2011 COMANCHE 25,965 97 km
2005 TOPANGA 24,133 28 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 57°F (14°C) 2.9 in
February 57°F (14°C) 2.9 in Wettest
March 58°F (14°C) 2.0 in
April 60°F (16°C) 0.6 in
May 62°F (17°C) 0.3 in
June 66°F (19°C) 0.1 in
July 69°F (21°C) 0.0 in
August 70°F (21°C) 0.0 in Warmest, Driest
September 70°F (21°C) 0.1 in
October 65°F (18°C) 0.5 in
November 61°F (16°C) 0.9 in
December 56°F (13°C) 1.7 in Coldest

Somis has a seasonal temperature swing of 14°F / from 56°F in December to 70°F in August. Total annual precipitation is 12.0 inches, with February being the wettest month (2.9") and August the driest (0.0").

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