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Weather & Climate in Oakley, CA

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

Oakley enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 48°F in January while summers reach 76°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 12.6 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 13 feet.

Temperature

48°F Jan (9°C) 76°F Jul (24°C)
Annual Average62.5°F
16% above US avg
January Average48°F (9°C)
July Average76°F (24°C)
Sunny Days330 days/yr

Geography

Elevation13 ft (4 m)
Area16.2 sq mi (41.9 km²)
Population Density2,792/sq mi
Coordinates37.9961°N, 121.6936°W
TimezoneAmerica/Los_Angeles
CountyContra Costa County County
Nearest AirportMetro Oakland International (OAK)
34 miles away

Precipitation & Snow

Annual Rainfall 12.6"
67% below US avg
Snowfall 0.0"
Wettest Month (Jan) 3.19"
Driest Month (Jul) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskVery High
Risk Score99.5 / 100
Social Vulnerability21.5 / 100
Community Resilience67.8 / 100

Hazard Breakdown

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

Earthquake History

5,293 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 59 km 11 km
Apr 18, 1990 5 km NNW of Aromas, California M5.4 118 km 5 km
Apr 18, 1990 4 km E of Interlaken, California M5.1 115 km 7 km
Aug 12, 1998 10 km SW of Ridgemark, California M5.1 140 km 9 km
Jan 16, 1993 9 km E of Gilroy, California M4.9 111 km 7 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 76 km 9 km
May 14, 2002 5 km SSW of Gilroy, California M4.9 115 km 7 km
Apr 18, 1990 4 km NNW of Aromas, California M4.9 119 km 6 km
Apr 19, 1996 2 km E of Aromas, California M4.9 124 km 5 km
Sep 4, 1995 13 km SW of Middletown, California M4.8 119 km 7 km
May 12, 2006 7 km W of Cobb, California M4.7 134 km 4 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 71 km 8 km
Apr 18, 1990 4 km N of Aromas, California M4.7 119 km 4 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 76 km 9 km
Jan 2, 2025 4 km NW of Cobb, CA M4.7 132 km 1 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 88 km 8 km
Mar 24, 1991 1 km NNE of Interlaken, California M4.6 115 km 15 km
Jan 11, 2000 6 km N of Geyserville, California M4.6 137 km 6 km
Feb 18, 2004 4 km WNW of Cobb, California M4.6 132 km 3 km
Jan 12, 2014 8 km W of Cobb, California M4.5 134 km 2 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

80 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 5 injuries.

Date Rating Distance Path Fatalities
May 5, 1998 EF2 76 km 0.6 mi 0
Feb 7, 1978 EF2 81 km 1.9 mi 0
Apr 27, 1953 EF2 72 km 0.1 mi 0
Jan 11, 1951 EF2 79 km 5.7 mi 0
Jan 10, 2023 EF1 83 km 0.4 mi 0
Dec 24, 2015 EF1 94 km 6.2 mi 0
Nov 15, 2015 EF1 93 km 3.0 mi 0
Jan 23, 2010 EF1 11 km 1.6 mi 0
Apr 14, 2006 EF1 72 km 0.5 mi 0
Mar 20, 2005 EF1 75 km 3.0 mi 0
May 5, 1998 EF1 78 km 0.3 mi 0
Dec 12, 1996 EF1 78 km 0.6 mi 0
Apr 19, 1988 EF1 89 km 1.0 mi 0
Apr 19, 1988 EF1 51 km 0.2 mi 0
Mar 22, 1983 EF1 86 km 2.0 mi 0
Jan 14, 1980 EF1 60 km 0.3 mi 0
Mar 4, 1978 EF1 86 km 2.5 mi 0
Mar 4, 1978 EF1 98 km 1.0 mi 0
Mar 1, 1978 EF1 76 km 1.5 mi 0
May 31, 1967 EF1 35 km 0.1 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 49 km
1989 N. CALIFORNIA Earthquake 1.0 m 62 108 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 77 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 78 km
1865 N. CALIFORNIA Eruption + Earthquake — — 90 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (143 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 143 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 59 km
2020 HENNESSEY 314,241 87 km
2018 COUNTY 92,450 86 km
2020 GLASS 68,020 97 km
2017 NUNS 56,883 81 km
2017 ATLAS 51,664 63 km
2007 LICK 47,424 89 km
2004 RUMSEY 39,335 99 km
2006 CANYON 36,851 77 km
1988 MILLER 35,750 60 km
2003 ANNIE 17,383 94 km
2024 CORRAL 16,138 45 km
2006 ZAM ASSIST 14,404 86 km
2018 WAVERLY 12,238 74 km
2009 CORRAL 12,006 48 km
1985 LEXINGTON 11,550 96 km
1996 SCOTT 8,828 85 km
2015 WRAGG 8,455 63 km
2003 BIRD 7,727 59 km
2014 MONTICELLO 6,984 69 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 48°F (9°C) 3.2 in Wettest
February 51°F (11°C) 2.6 in
March 54°F (12°C) 2.1 in
April 58°F (15°C) 1.0 in
May 64°F (18°C) 0.4 in
June 70°F (21°C) 0.1 in
July 76°F (24°C) 0.0 in Warmest, Driest
August 74°F (23°C) 0.1 in
September 71°F (22°C) 0.2 in
October 65°F (18°C) 0.9 in
November 54°F (12°C) 2.2 in
December 47°F (8°C) 2.3 in Coldest

Oakley has a seasonal temperature swing of 29°F / from 47°F in December to 76°F in July. Total annual precipitation is 15.2 inches, with January being the wettest month (3.2") and July the driest (0.0").

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