Sign In Register

Weather & Climate in Westminster, CA

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

Westminster enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 53°F in January while summers reach 71°F in July / relatively mild seasonal variation. 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 28.5 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 36 feet.

Temperature

53°F Jan (12°C) 71°F Jul (22°C)
Annual Average62.7°F
16% above US avg
January Average53°F (12°C)
July Average71°F (22°C)
Sunny Days330 days/yr

Geography

Elevation36 ft (11 m)
Area10.0 sq mi (26.0 km²)
Population Density8,979/sq mi
Coordinates33.7523°N, 117.9939°W
TimezoneAmerica/Los_Angeles
CountyOrange County County
Nearest AirportJohn Wayne/Orange County (SNA)
9 miles away

Precipitation & Snow

Annual Rainfall 28.5"
25% below US avg
Snowfall 0.0"
Wettest Month (Jan) 2.91"
Driest Month (Jul) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskVery High
Risk Score99.8 / 100
Social Vulnerability24.9 / 100
Community Resilience16.3 / 100

Hazard Breakdown

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

Earthquake History

6,391 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.7.

Jan 17, 1994 Northridge, California, earthquake M6.7 72 km 18 km
Jun 28, 1992 The 1992 Big Bear, California Earthquake M6.3 119 km 4 km
Jan 17, 1994 1km ENE of Granada Hills, California M5.9 74 km 5 km
Jun 28, 1991 The 1991 Sierra Madre, California Earthquake M5.8 58 km 8 km
Oct 16, 1999 7km ENE of Running Springs, CA M5.6 103 km 6 km
Jan 17, 1994 7km NNE of Simi Valley, California M5.6 91 km 9 km
Jun 28, 1992 11km SSE of Big Bear Lake, California M5.5 115 km 10 km
Feb 28, 1990 The 1990 Upland, California Earthquake M5.5 51 km 3 km
Jul 7, 2010 20km NNW of Borrego Springs, CA M5.4 146 km 12 km
Nov 27, 1992 10km NNW of Big Bear City, California M5.3 120 km 0 km
Jun 28, 1992 1km N of Big Bear Lake, California M5.3 114 km 7 km
Dec 4, 1992 10km SE of Lucerne Valley, California M5.3 122 km 1 km
Jan 18, 1994 10km ESE of Piru, California M5.2 95 km 11 km
Mar 20, 1994 3km WNW of Panorama City, California M5.2 69 km 12 km
Aug 17, 1992 7km SE of Big Bear Lake, California M5.2 115 km 9 km
Jan 17, 1994 9km N of Chatsworth, California M5.2 87 km 5 km
Jun 12, 2005 10km ESE of Anza, CA M5.2 134 km 13 km
Jun 10, 2016 20km NNW of Borrego Springs, CA M5.2 148 km 12 km
Mar 29, 2014 2km NW of Brea, CA M5.1 21 km 5 km
Aug 20, 2023 7 km SE of Ojai, CA M5.1 132 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

108 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 58 injuries.

Date Rating Distance Path Fatalities
May 22, 2008 EF2 70 km 2.8 mi 0
Mar 1, 1983 EF2 43 km 3.5 mi 0
Nov 9, 1982 EF2 64 km 1.0 mi 0
Nov 9, 1982 EF2 19 km 10.0 mi 0
Nov 7, 1966 EF2 33 km 10.3 mi 0
Nov 7, 1966 EF2 13 km 0.2 mi 0
Nov 7, 1966 EF2 33 km 0.1 mi 0
Mar 22, 2023 EF1 30 km 0.5 mi 0
Jan 19, 2010 EF1 13 km 4.6 mi 0
Feb 19, 2005 EF1 82 km 2.8 mi 0
Jan 9, 1998 EF1 17 km 1.5 mi 0
Dec 21, 1997 EF1 9 km 1.0 mi 0
Nov 11, 1997 EF1 18 km 0.2 mi 0
Jan 14, 1993 EF1 15 km 1.0 mi 0
Dec 7, 1992 EF1 1 km 0.1 mi 0
Dec 7, 1992 EF1 11 km 0.1 mi 0
Mar 20, 1992 EF1 42 km 0.2 mi 0
Mar 27, 1991 EF1 9 km 3.0 mi 0
Mar 16, 1986 EF1 11 km 1.2 mi 0
Oct 1, 1983 EF1 38 km 0.3 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

4 tsunamis recorded within 500 km. Highest wave on record: 3.1 m (10 ft).

Year Location Cause Max Wave Deaths Distance
1930 S. CALIFORNIA Eruption + Earthquake 3.1 m 1 67 km
1862 S. CALIFORNIA Eruption + Earthquake 1.2 m — 138 km
1994 WEST COAST, USA Earthquake 0.1 m 57 72 km
1855 S. CALIFORNIA Eruption + Earthquake — — 40 km
Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: STATION (165,368 acres, 2009).

Year Name Acres Burned Distance
2009 STATION 165,368 65 km
2020 BOBCAT 115,728 64 km
2003 SIMI 107,756 98 km
2018 WOOLSEY 97,962 87 km
2003 OLD 90,180 86 km
2003 GRAND PRIX 50,799 68 km
2016 SAND 41,561 78 km
2007 BUCKWEED 41,332 95 km
1993 GREEN MEADOWS 38,115 99 km
2002 WILLIAMS 37,505 53 km
2016 BLUE CUT 36,856 78 km
2008 YELLOW 33,232 64 km
2008 FREEWAY COMPLEX 29,350 29 km
2007 SANTIAGO 27,605 31 km
1998 EDNA 27,561 94 km
2020 INDIA 24,193 66 km
2005 TOPANGA 24,133 83 km
1993 CALIFORNIA 23,899 90 km
2018 HOLY 22,845 49 km
1993 ORTEGA 20,912 50 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 53°F (12°C) 2.9 in Coldest, Wettest
February 58°F (15°C) 2.9 in
March 59°F (15°C) 2.6 in
April 62°F (17°C) 0.8 in
May 65°F (18°C) 0.2 in
June 69°F (21°C) 0.1 in
July 71°F (22°C) 0.0 in Driest
August 74°F (23°C) 0.1 in Warmest
September 72°F (22°C) 0.3 in
October 68°F (20°C) 0.4 in
November 62°F (16°C) 1.3 in
December 57°F (14°C) 1.9 in

Westminster has a seasonal temperature swing of 20°F / from 53°F in January to 74°F in August. Total annual precipitation is 13.5 inches, with January being the wettest month (2.9") and July the driest (0.0").

View full profile of Westminster, CA →