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Weather & Climate in Loma Mar, CA

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

Loma Mar experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 50°F in January while summers reach 61°F in July / relatively mild seasonal variation. The area gets 317 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 30.4 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 921 feet.

Temperature

50°F Jan (10°C) 61°F Jul (16°C)
Annual Average54.8°F
1% above US avg
January Average50°F (10°C)
July Average61°F (16°C)
Sunny Days317 days/yr

Geography

Elevation921 ft (281 m)
Area1.7 sq mi (4.5 km²)
Population Density184/sq mi
Coordinates37.2658°N, 122.3007°W
TimezoneAmerica/Los_Angeles
CountySan Mateo County County
Nearest AirportNorman Y Mineta San Jose International (SJC)
22 miles away

Precipitation & Snow

Annual Rainfall 30.4"
20% below US avg
Snowfall 0.0"
Wettest Month (Jan) 6.73"
Driest Month (Jul) 0.12"

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

4,049 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.

Aug 24, 2014 The 2014 South Napa, California Earthquake M6.0 106 km 11 km
Apr 18, 1990 5 km NNW of Aromas, California M5.4 68 km 5 km
Apr 18, 1990 4 km E of Interlaken, California M5.1 64 km 7 km
Aug 12, 1998 10 km SW of Ridgemark, California M5.1 94 km 9 km
Jan 16, 1993 9 km E of Gilroy, California M4.9 79 km 7 km
May 14, 2002 5 km SSW of Gilroy, California M4.9 71 km 7 km
Apr 18, 1990 4 km NNW of Aromas, California M4.9 68 km 6 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 124 km 9 km
Apr 19, 1996 2 km E of Aromas, California M4.9 74 km 5 km
Apr 23, 1995 22 km NNE of Soledad, California M4.9 123 km 7 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 52 km 8 km
Apr 18, 1990 4 km N of Aromas, California M4.7 70 km 4 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 55 km 9 km
Aug 27, 2011 21 km NE of Soledad, California M4.6 125 km 8 km
Mar 24, 1991 1 km NNE of Interlaken, California M4.6 61 km 15 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 79 km 8 km
Sep 19, 2023 15 km SW of Westley, CA M4.5 91 km 4 km
Jan 12, 2011 9 km SSE of San Juan Bautista, California M4.5 90 km 8 km
Aug 3, 2006 5 km W of Glen Ellen, California M4.5 125 km 9 km
Apr 4, 2023 1km NNW of Tres Pinos, CA M4.4 101 km 10 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

36 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 10 injuries.

Date Rating Distance Path Fatalities
May 5, 1998 EF2 27 km 0.6 mi 0
Mar 11, 1985 EF2 92 km 0.5 mi 0
Jan 11, 1951 EF2 20 km 5.7 mi 0
Dec 14, 2024 EF1 34 km 0.3 mi 0
Jan 23, 2010 EF1 86 km 1.6 mi 0
Mar 20, 2005 EF1 44 km 3.0 mi 0
Dec 20, 2001 EF1 57 km 0.5 mi 0
May 5, 1998 EF1 20 km 0.3 mi 0
Dec 6, 1992 EF1 87 km 7.0 mi 0
Dec 6, 1992 EF1 83 km 1.0 mi 0
Jan 14, 1980 EF1 44 km 0.3 mi 0
Apr 1, 1965 EF1 55 km 0.1 mi 0
Apr 1, 1958 EF1 40 km 0.2 mi 0
Jan 6, 2019 EF0 43 km 0.5 mi 0
Jan 6, 2019 EF0 41 km 0.1 mi 0
Jan 6, 2016 EF0 89 km 0.6 mi 0
Dec 22, 2012 EF0 60 km 1.1 mi 0
Apr 14, 2007 EF0 69 km 0.2 mi 0
Dec 26, 2005 EF0 94 km 0.3 mi 0
Dec 5, 1998 EF0 40 km 1.0 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 51 km
1989 N. CALIFORNIA Earthquake 1.0 m 62 45 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 26 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 51 km
1865 N. CALIFORNIA Eruption + Earthquake — — 36 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (194 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 194 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 75 km
2020 CZU AUG LIGHTNING 85,894 15 km
2007 LICK 47,424 77 km
2006 CANYON 36,851 85 km
2003 ANNIE 17,383 94 km
2024 CORRAL 16,138 85 km
2009 CORRAL 12,006 81 km
1995 VISION 11,931 100 km
1985 LEXINGTON 11,550 37 km
2009 LOCKHEED 8,287 22 km
2003 BIRD 7,727 91 km
1984 SITE 300 3 6,911 85 km
2005 TESLA 6,638 78 km
2003 DEL PUERTO 6,441 82 km
2006 MIDWAY 6,243 82 km
2020 CREWS 5,802 80 km
2003 DEVIL 4,975 69 km
2020 WOODWARD 4,952 96 km
2003 JUMP 4,817 70 km
2016 LOMA 4,380 46 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 50°F (10°C) 6.7 in Wettest
February 50°F (10°C) 5.4 in
March 51°F (11°C) 5.2 in
April 53°F (12°C) 2.4 in
May 57°F (14°C) 0.6 in
June 60°F (16°C) 0.2 in
July 61°F (16°C) 0.1 in Driest
August 64°F (18°C) 0.2 in Warmest
September 64°F (18°C) 0.4 in
October 60°F (15°C) 1.8 in
November 53°F (12°C) 4.8 in
December 49°F (9°C) 5.3 in Coldest

Loma Mar has a seasonal temperature swing of 16°F / from 49°F in December to 64°F in August. Total annual precipitation is 33.1 inches, with January being the wettest month (6.7") and July the driest (0.1").

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