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Weather & Climate in Bayview CDP (Contra Costa County), CA

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

Bayview CDP (Contra Costa County) enjoys a temperate climate with an average annual temperature of 62°F (16°C). Winters average 50°F in January while summers reach 71°F in July. The area gets 326 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 21.5 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 49 feet.

Temperature

50°F Jan (10°C) 71°F Jul (21°C)
Annual Average61.6°F
14% above US avg
January Average50°F (10°C)
July Average71°F (21°C)
Sunny Days326 days/yr

Geography

Elevation49 ft (15 m)
Area0.4 sq mi (1.0 km²)
Population Density8,171/sq mi
Coordinates38.0062°N, 122.3202°W
TimezoneAmerica/Los_Angeles
CountyMarin County County
Nearest AirportMetro Oakland International (OAK)
20 miles away

Precipitation & Snow

Annual Rainfall 21.5"
43% below US avg
Wettest Month (Jan) 5.75"
Driest Month (Jul) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively High
Risk Score96.4 / 100
Social Vulnerability24.7 / 100
Community Resilience99.2 / 100

Hazard Breakdown

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

Earthquake History

4,825 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 23 km 11 km
Apr 18, 1990 5 km NNW of Aromas, California M5.4 133 km 5 km
Apr 18, 1990 4 km E of Interlaken, California M5.1 129 km 7 km
Jan 16, 1993 9 km E of Gilroy, California M4.9 133 km 7 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 42 km 9 km
Apr 19, 1996 2 km E of Aromas, California M4.9 139 km 5 km
May 14, 2002 5 km SSW of Gilroy, California M4.9 132 km 7 km
Apr 18, 1990 4 km NNW of Aromas, California M4.9 133 km 6 km
Sep 4, 1995 13 km SW of Middletown, California M4.8 84 km 7 km
May 12, 2006 7 km W of Cobb, California M4.7 100 km 4 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 89 km 8 km
Apr 18, 1990 4 km N of Aromas, California M4.7 134 km 4 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 96 km 9 km
Jan 2, 2025 4 km NW of Cobb, CA M4.7 101 km 1 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 34 km 8 km
Mar 24, 1991 1 km NNE of Interlaken, California M4.6 127 km 15 km
Jan 11, 2000 6 km N of Geyserville, California M4.6 99 km 6 km
Feb 18, 2004 4 km WNW of Cobb, California M4.6 100 km 3 km
Sep 19, 2023 15 km SW of Westley, CA M4.5 110 km 4 km
Jan 12, 2014 8 km W of Cobb, California M4.5 100 km 2 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
May 5, 1998 EF2 75 km 0.6 mi 0
Jun 1, 1958 EF2 65 km 15.0 mi 0
Jan 11, 1951 EF2 73 km 5.7 mi 0
Mar 18, 2011 EF1 60 km 0.1 mi 0
Jan 23, 2010 EF1 50 km 1.6 mi 0
Mar 20, 2005 EF1 41 km 3.0 mi 0
Jan 27, 2005 EF1 98 km 0.5 mi 0
Dec 5, 1998 EF1 60 km 1.5 mi 0
May 5, 1998 EF1 72 km 0.3 mi 0
Dec 23, 1996 EF1 60 km 6.0 mi 0
Feb 22, 1996 EF1 70 km 1.0 mi 0
Dec 2, 1992 EF1 67 km 7.5 mi 0
Dec 2, 1992 EF1 75 km 3.0 mi 0
Dec 2, 1992 EF1 63 km 1.0 mi 0
Feb 27, 1983 EF1 60 km 0.8 mi 0
Jan 14, 1980 EF1 70 km 0.3 mi 0
May 31, 1967 EF1 90 km 0.1 mi 0
Nov 10, 1964 EF1 72 km 1.0 mi 0
Feb 17, 1959 EF1 99 km 0.5 mi 0
Apr 1, 1958 EF1 43 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 39 km
1989 N. CALIFORNIA Earthquake 1.0 m 62 115 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 56 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 38 km
1865 N. CALIFORNIA Eruption + Earthquake — — 97 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (114 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 114 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 92 km
2020 HENNESSEY 314,241 69 km
2018 COUNTY 92,450 77 km
2020 CZU AUG LIGHTNING 85,894 96 km
2019 KINCADE 77,780 84 km
2015 VALLEY 77,507 91 km
2020 GLASS 68,020 64 km
2017 NUNS 56,883 41 km
2020 WALLBRIDGE 55,194 91 km
2017 ATLAS 51,664 40 km
2004 RUMSEY 39,335 84 km
1999 SIXTEEN 37,162 89 km
2017 TUBBS 36,981 70 km
1988 MILLER 35,750 51 km
2017 POCKET 18,691 98 km
2024 CORRAL 16,138 86 km
2006 ZAM ASSIST 14,404 91 km
2004 GEYSERS 12,075 89 km
2009 CORRAL 12,006 86 km
1995 VISION 11,931 48 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 50°F (10°C) 5.8 in Wettest
February 52°F (11°C) 4.9 in
March 54°F (12°C) 3.9 in
April 58°F (14°C) 1.4 in
May 63°F (17°C) 0.6 in
June 68°F (20°C) 0.2 in
July 71°F (21°C) 0.0 in Warmest, Driest
August 71°F (21°C) 0.1 in
September 69°F (20°C) 0.3 in
October 63°F (17°C) 1.5 in
November 54°F (12°C) 3.9 in
December 47°F (8°C) 4.2 in Coldest

Bayview CDP (Contra Costa County) has a seasonal temperature swing of 23°F / from 47°F in December to 71°F in July. Total annual precipitation is 26.7 inches, with January being the wettest month (5.8") and July the driest (0.0").

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