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 66°F (19°C). Winters average 55°F in January while summers reach 79°F in July. The area gets 330 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 16.8 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 344 feet.

Temperature

55°F Jan (13°C) 79°F Jul (26°C)

Annual Average	65.5°F
	21% above US avg
January Average	55°F (13°C)
July Average	79°F (26°C)
Sunny Days	330 days/yr

Geography

Elevation	344 ft (105 m)
Area	3.4 sq mi (8.7 km²)
Population Density	376/sq mi
Coordinates	34.2653°N, 118.9984°W
Timezone	America/Los_Angeles
County	Los Angeles County County
Nearest Airport	Bob Hope (BUR) 37 miles away

Precipitation & Snow

Annual Rainfall 16.8"

56% below US avg

Snowfall 0.1"

Wettest Month (Feb) 3.50"

Driest Month (Jun) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very High
Risk Score	100.0 / 100
Social Vulnerability	55.4 / 100
Community Resilience	13.6 / 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	55°F (13°C)	3.4 in	Coldest
February	55°F (13°C)	3.5 in	Wettest
March	56°F (13°C)	2.8 in
April	59°F (15°C)	1.0 in
May	63°F (17°C)	0.2 in
June	67°F (19°C)	0.0 in
July	79°F (26°C)	0.0 in	Warmest, Driest
August	72°F (22°C)	0.1 in
September	70°F (21°C)	0.2 in
October	66°F (19°C)	0.3 in
November	60°F (15°C)	2.2 in
December	55°F (13°C)	2.3 in

Somis has a seasonal temperature swing of 24°F / from 55°F in January to 79°F in July. Total annual precipitation is 16.0 inches, with February being the wettest month (3.5") and July the driest (0.0").

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