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Weather & Climate in East Richmond Heights, CA

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

East Richmond Heights enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 51°F in January while summers reach 63°F in July / relatively mild seasonal variation. The area gets 323 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 24.4 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 399 feet.

Temperature

51°F Jan (11°C) 63°F Jul (17°C)
Annual Average58.8°F
9% above US avg
January Average51°F (11°C)
July Average63°F (17°C)
Sunny Days323 days/yr

Geography

Elevation399 ft (122 m)
Area0.6 sq mi (1.5 km²)
Population Density5,709/sq mi
Coordinates37.9451°N, 122.3139°W
TimezoneAmerica/Los_Angeles
CountySan Mateo County County
Nearest AirportMetro Oakland International (OAK)
16 miles away

Precipitation & Snow

Annual Rainfall 24.4"
36% below US avg
Snowfall 0.0"
Wettest Month (Jan) 6.02"
Driest Month (Jul) 0.08"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively High
Risk Score99.2 / 100
Social Vulnerability20.5 / 100
Community Resilience97.6 / 100

Hazard Breakdown

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

Earthquake History

4,963 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.

Aug 24, 2014 The 2014 South Napa, California Earthquake M6.0 30 km 11 km
Apr 18, 1990 5 km NNW of Aromas, California M5.4 127 km 5 km
Apr 18, 1990 4 km E of Interlaken, California M5.1 123 km 7 km
Jan 16, 1993 9 km E of Gilroy, California M4.9 128 km 7 km
Apr 19, 1996 2 km E of Aromas, California M4.9 133 km 5 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 49 km 9 km
Apr 18, 1990 4 km NNW of Aromas, California M4.9 127 km 6 km
May 14, 2002 5 km SSW of Gilroy, California M4.9 126 km 7 km
Sep 4, 1995 13 km SW of Middletown, California M4.8 90 km 7 km
May 12, 2006 7 km W of Cobb, California M4.7 106 km 4 km
Apr 18, 1990 4 km N of Aromas, California M4.7 128 km 4 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 83 km 8 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 90 km 9 km
Jan 2, 2025 4 km NW of Cobb, CA M4.7 107 km 1 km
Mar 24, 1991 1 km NNE of Interlaken, California M4.6 121 km 15 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 33 km 8 km
Jan 11, 2000 6 km N of Geyserville, California M4.6 106 km 6 km
Feb 18, 2004 4 km WNW of Cobb, California M4.6 107 km 3 km
Sep 19, 2023 15 km SW of Westley, CA M4.5 106 km 4 km
Jan 12, 2014 8 km W of Cobb, California M4.5 106 km 2 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

57 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 4 injuries.

Date Rating Distance Path Fatalities
May 5, 1998 EF2 69 km 0.6 mi 0
Jun 1, 1958 EF2 69 km 15.0 mi 0
Jan 11, 1951 EF2 66 km 5.7 mi 0
Mar 18, 2011 EF1 66 km 0.1 mi 0
Jan 23, 2010 EF1 48 km 1.6 mi 0
Mar 20, 2005 EF1 34 km 3.0 mi 0
Dec 5, 1998 EF1 66 km 1.5 mi 0
May 5, 1998 EF1 65 km 0.3 mi 0
Dec 23, 1996 EF1 64 km 6.0 mi 0
Feb 22, 1996 EF1 77 km 1.0 mi 0
Dec 2, 1992 EF1 72 km 7.5 mi 0
Dec 2, 1992 EF1 81 km 3.0 mi 0
Dec 2, 1992 EF1 68 km 1.0 mi 0
Feb 27, 1983 EF1 66 km 0.8 mi 0
Jan 14, 1980 EF1 64 km 0.3 mi 0
May 31, 1967 EF1 89 km 0.1 mi 0
Nov 10, 1964 EF1 78 km 1.0 mi 0
Apr 1, 1958 EF1 36 km 0.2 mi 0
Nov 8, 2022 EF0 97 km 0.8 mi 0
Sep 28, 2019 EF0 86 km 1.7 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

5 tsunamis recorded within 500 km. Highest wave on record: 4.5 m (15 ft).

Year Location Cause Max Wave Deaths Distance
1868 N. CALIFORNIA Eruption + Earthquake 4.5 m 30 33 km
1989 N. CALIFORNIA Earthquake 1.0 m 62 108 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 50 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 32 km
1865 N. CALIFORNIA Eruption + Earthquake — — 91 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (121 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 121 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: SCU LIGHTNING COMPLEX (405,787 acres, 2020).

Year Name Acres Burned Distance
2020 SCU LIGHTNING COMPLEX 405,787 88 km
2020 HENNESSEY 314,241 75 km
2018 COUNTY 92,450 83 km
2020 CZU AUG LIGHTNING 85,894 89 km
2019 KINCADE 77,780 90 km
2015 VALLEY 77,507 97 km
2020 GLASS 68,020 71 km
2017 NUNS 56,883 48 km
2020 WALLBRIDGE 55,194 96 km
2017 ATLAS 51,664 47 km
2004 RUMSEY 39,335 90 km
1999 SIXTEEN 37,162 95 km
2017 TUBBS 36,981 76 km
1988 MILLER 35,750 57 km
2024 CORRAL 16,138 83 km
2006 ZAM ASSIST 14,404 97 km
2004 GEYSERS 12,075 95 km
2009 CORRAL 12,006 83 km
1995 VISION 11,931 49 km
1985 LEXINGTON 11,550 96 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 51°F (11°C) 6.0 in Wettest
February 51°F (11°C) 5.1 in
March 53°F (12°C) 4.2 in
April 56°F (14°C) 1.7 in
May 60°F (16°C) 0.6 in
June 64°F (18°C) 0.2 in
July 63°F (17°C) 0.1 in Driest
August 67°F (20°C) 0.1 in Warmest
September 67°F (19°C) 0.4 in
October 63°F (17°C) 1.5 in
November 55°F (13°C) 4.1 in
December 49°F (9°C) 4.4 in Coldest

East Richmond Heights has a seasonal temperature swing of 19°F / from 49°F in December to 67°F in August. Total annual precipitation is 28.3 inches, with January being the wettest month (6.0") and July the driest (0.1").

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