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Weather & Climate in South El Monte, CA

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

South El Monte enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 57°F in January while summers reach 75°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 15.7 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 248 feet.

Temperature

57°F Jan (14°C) 75°F Jul (24°C)
Annual Average66.0°F
22% above US avg
January Average57°F (14°C)
July Average75°F (24°C)
Sunny Days330 days/yr

Geography

Elevation248 ft (76 m)
Area2.9 sq mi (7.4 km²)
Population Density6,836/sq mi
Coordinates34.0504°N, 118.0484°W
TimezoneAmerica/Los_Angeles
CountyLos Angeles County County
Nearest AirportBob Hope (BUR)
21 miles away

Precipitation & Snow

Annual Rainfall 15.7"
59% below US avg
Snowfall 0.0"
Wettest Month (Feb) 3.82"
Driest Month (Jul) 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

8,509 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.3.

Jun 28, 1992 The 1992 Landers, California Earthquake M7.3 149 km 0 km
Jan 17, 1994 Northridge, California, earthquake M6.7 49 km 18 km
Jun 28, 1992 The 1992 Big Bear, California Earthquake M6.3 114 km 4 km
Jan 17, 1994 1km ENE of Granada Hills, California M5.9 48 km 5 km
Jun 28, 1991 The 1991 Sierra Madre, California Earthquake M5.8 25 km 8 km
Jul 11, 1992 12km NW of California City, California M5.7 129 km 10 km
Oct 16, 1999 7km ENE of Running Springs, CA M5.6 95 km 6 km
Jan 17, 1994 7km NNE of Simi Valley, California M5.6 67 km 9 km
Jun 28, 1992 11km SSE of Big Bear Lake, California M5.5 111 km 10 km
Feb 28, 1990 The 1990 Upland, California Earthquake M5.5 34 km 3 km
Jun 28, 1992 0km E of Yucca Valley, CA M5.5 150 km 8 km
Jun 28, 1992 26km NNW of Yucca Valley, CA M5.4 145 km 4 km
Jul 1, 1992 24km N of Yucca Valley, California M5.3 149 km 5 km
Nov 27, 1992 10km NNW of Big Bear City, California M5.3 110 km 0 km
Jun 28, 1992 1km N of Big Bear Lake, California M5.3 107 km 7 km
Dec 4, 1992 10km SE of Lucerne Valley, California M5.3 112 km 1 km
Mar 20, 1994 3km WNW of Panorama City, California M5.2 44 km 12 km
Jan 18, 1994 10km ESE of Piru, California M5.2 70 km 11 km
Aug 17, 1992 7km SE of Big Bear Lake, California M5.2 110 km 9 km
Jan 17, 1994 9km N of Chatsworth, California M5.2 61 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

112 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 54 injuries.

Date Rating Distance Path Fatalities
May 22, 2008 EF2 76 km 2.8 mi 0
Mar 1, 1983 EF2 31 km 3.5 mi 0
Nov 9, 1982 EF2 40 km 1.0 mi 0
Nov 9, 1982 EF2 33 km 10.0 mi 0
Nov 7, 1966 EF2 34 km 10.3 mi 0
Nov 7, 1966 EF2 29 km 0.1 mi 0
Nov 7, 1966 EF2 46 km 0.2 mi 0
Mar 22, 2023 EF1 9 km 0.5 mi 0
Jan 19, 2010 EF1 38 km 4.6 mi 0
Jan 9, 1998 EF1 32 km 1.5 mi 0
Dec 21, 1997 EF1 43 km 1.0 mi 0
Nov 11, 1997 EF1 46 km 0.2 mi 0
May 18, 1997 EF1 99 km 3.5 mi 0
May 11, 1997 EF1 94 km 0.2 mi 0
Jan 14, 1993 EF1 21 km 1.0 mi 0
Dec 7, 1992 EF1 27 km 0.1 mi 0
Dec 7, 1992 EF1 34 km 0.1 mi 0
Mar 20, 1992 EF1 13 km 0.2 mi 0
Mar 27, 1991 EF1 43 km 3.0 mi 0
Mar 16, 1986 EF1 27 km 1.2 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

3 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 55 km
1994 WEST COAST, USA Earthquake 0.1 m 57 49 km
1855 S. CALIFORNIA Eruption + Earthquake — — 7 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 32 km
2020 BOBCAT 115,728 32 km
2003 SIMI 107,756 75 km
2018 WOOLSEY 97,962 72 km
2003 OLD 90,180 74 km
2003 PIRU 63,920 89 km
1999 WILLOW 63,525 93 km
2003 GRAND PRIX 50,799 55 km
2016 SAND 41,561 47 km
2007 BUCKWEED 41,332 63 km
1993 GREEN MEADOWS 38,115 86 km
2002 WILLIAMS 37,505 30 km
2007 RANCH 37,009 81 km
2016 BLUE CUT 36,856 58 km
2008 YELLOW 33,232 92 km
2013 POWERHOUSE 32,329 78 km
2020 LAKE 30,971 85 km
2008 FREEWAY COMPLEX 29,350 31 km
2007 SANTIAGO 27,605 51 km
1998 EDNA 27,561 99 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 57°F (14°C) 3.6 in
February 58°F (14°C) 3.8 in Wettest
March 59°F (15°C) 3.3 in
April 63°F (17°C) 1.0 in
May 66°F (19°C) 0.2 in
June 71°F (22°C) 0.1 in
July 75°F (24°C) 0.0 in Driest
August 76°F (25°C) 0.1 in Warmest
September 74°F (23°C) 0.3 in
October 68°F (20°C) 0.5 in
November 61°F (16°C) 1.6 in
December 56°F (13°C) 2.2 in Coldest

South El Monte has a seasonal temperature swing of 20°F / from 56°F in December to 76°F in August. Total annual precipitation is 16.7 inches, with February being the wettest month (3.8") and July the driest (0.0").

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