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Weather & Climate in Moraga, CA

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

Moraga enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 51°F in January while summers reach 64°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 26.1 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 652 feet.

Temperature

51°F Jan (11°C) 64°F Jul (18°C)
Annual Average58.5°F
8% above US avg
January Average51°F (11°C)
July Average64°F (18°C)
Sunny Days323 days/yr

Geography

Elevation652 ft (199 m)
Area9.4 sq mi (24.4 km²)
Population Density1,775/sq mi
Coordinates37.8457°N, 122.1232°W
TimezoneAmerica/Los_Angeles
CountySan Mateo County County
Nearest AirportMetro Oakland International (OAK)
10 miles away

Precipitation & Snow

Annual Rainfall 26.1"
31% below US avg
Snowfall 0.0"
Wettest Month (Jan) 4.65"
Driest Month (Jul) 0.04"

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

5,371 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 44 km 11 km
Apr 18, 1990 5 km NNW of Aromas, California M5.4 110 km 5 km
Apr 18, 1990 4 km E of Interlaken, California M5.1 106 km 7 km
Aug 12, 1998 10 km SW of Ridgemark, California M5.1 135 km 9 km
Jan 16, 1993 9 km E of Gilroy, California M4.9 109 km 7 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 65 km 9 km
Apr 18, 1990 4 km NNW of Aromas, California M4.9 110 km 6 km
Apr 19, 1996 2 km E of Aromas, California M4.9 116 km 5 km
May 14, 2002 5 km SSW of Gilroy, California M4.9 108 km 7 km
Sep 4, 1995 13 km SW of Middletown, California M4.8 108 km 7 km
May 12, 2006 7 km W of Cobb, California M4.7 124 km 4 km
Apr 18, 1990 4 km N of Aromas, California M4.7 111 km 4 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 65 km 8 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 71 km 9 km
Jan 2, 2025 4 km NW of Cobb, CA M4.7 124 km 1 km
Mar 24, 1991 1 km NNE of Interlaken, California M4.6 104 km 15 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 50 km 8 km
Jan 11, 2000 6 km N of Geyserville, California M4.6 124 km 6 km
Feb 18, 2004 4 km WNW of Cobb, California M4.6 124 km 3 km
Jan 12, 2014 8 km W of Cobb, California M4.5 123 km 2 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

65 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 9 injuries.

Date Rating Distance Path Fatalities
May 5, 1998 EF2 54 km 0.6 mi 0
Jun 1, 1958 EF2 89 km 15.0 mi 0
Jan 11, 1951 EF2 53 km 5.7 mi 0
Dec 14, 2024 EF1 89 km 0.3 mi 0
Mar 18, 2011 EF1 85 km 0.1 mi 0
Jan 23, 2010 EF1 32 km 1.6 mi 0
Mar 20, 2005 EF1 34 km 3.0 mi 0
Dec 5, 1998 EF1 84 km 1.5 mi 0
May 5, 1998 EF1 52 km 0.3 mi 0
Dec 23, 1996 EF1 84 km 6.0 mi 0
Feb 22, 1996 EF1 95 km 1.0 mi 0
Dec 2, 1992 EF1 92 km 7.5 mi 0
Dec 2, 1992 EF1 99 km 3.0 mi 0
Dec 2, 1992 EF1 87 km 1.0 mi 0
Apr 19, 1988 EF1 93 km 0.2 mi 0
Feb 27, 1983 EF1 84 km 0.8 mi 0
Jan 14, 1980 EF1 46 km 0.3 mi 0
May 31, 1967 EF1 74 km 0.1 mi 0
Nov 10, 1964 EF1 96 km 1.0 mi 0
Apr 1, 1958 EF1 32 km 0.2 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 16 km
1989 N. CALIFORNIA Earthquake 1.0 m 62 93 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 42 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 37 km
1865 N. CALIFORNIA Eruption + Earthquake — — 74 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (137 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 137 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 67 km
2020 HENNESSEY 314,241 88 km
2018 COUNTY 92,450 93 km
2020 CZU AUG LIGHTNING 85,894 78 km
2020 GLASS 68,020 87 km
2017 NUNS 56,883 65 km
2017 ATLAS 51,664 59 km
2007 LICK 47,424 93 km
2017 TUBBS 36,981 94 km
2006 CANYON 36,851 87 km
1988 MILLER 35,750 65 km
2024 CORRAL 16,138 63 km
2009 CORRAL 12,006 63 km
1995 VISION 11,931 69 km
1985 LEXINGTON 11,550 80 km
2015 WRAGG 8,455 71 km
2009 LOCKHEED 8,287 85 km
2003 BIRD 7,727 77 km
2014 MONTICELLO 6,984 77 km
1984 SITE 300 3 6,911 61 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 51°F (11°C) 4.7 in Wettest
February 51°F (11°C) 3.9 in
March 54°F (12°C) 3.2 in
April 57°F (14°C) 1.3 in
May 62°F (17°C) 0.5 in
June 67°F (19°C) 0.1 in
July 64°F (18°C) 0.0 in Driest
August 70°F (21°C) 0.1 in Warmest
September 68°F (20°C) 0.3 in
October 63°F (17°C) 1.2 in
November 54°F (12°C) 3.2 in
December 48°F (9°C) 3.3 in Coldest

Moraga has a seasonal temperature swing of 22°F / from 48°F in December to 70°F in August. Total annual precipitation is 21.8 inches, with January being the wettest month (4.7") and July the driest (0.0").

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