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Weather & Climate in Fallbrook, CA

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

Fallbrook enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 57°F in January while summers reach 74°F in July / relatively mild seasonal variation. 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 15.3 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 768 feet.

Temperature

57°F Jan (14°C) 74°F Jul (23°C)
Annual Average65.1°F
21% above US avg
January Average57°F (14°C)
July Average74°F (23°C)
Sunny Days330 days/yr

Geography

Elevation768 ft (234 m)
Area17.5 sq mi (45.4 km²)
Population Density1,851/sq mi
Coordinates33.3742°N, 117.2204°W
TimezoneAmerica/Los_Angeles
CountyOrange County County
Nearest AirportJohn Wayne/Orange County (SNA)
43 miles away

Precipitation & Snow

Annual Rainfall 15.3"
60% below US avg
Wettest Month (Jan) 2.56"
Driest Month (Jul) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskVery High
Risk Score99.8 / 100
Social Vulnerability24.9 / 100
Community Resilience16.3 / 100

Hazard Breakdown

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

Earthquake History

10,769 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.3.

Jun 28, 1992 The 1992 Landers, California Earthquake M7.3 117 km 0 km
Jun 28, 1992 The 1992 Big Bear, California Earthquake M6.3 99 km 4 km
Apr 23, 1992 The 1992 Joshua Tree, California Earthquake M6.1 106 km 12 km
Jun 28, 1991 The 1991 Sierra Madre, California Earthquake M5.8 123 km 8 km
Jun 28, 1992 3km NE of Yucca Valley, California M5.8 113 km -1 km
Jun 15, 2010 8km ESE of Ocotillo, CA M5.7 143 km 9 km
Jun 28, 1992 2km SSW of Joshua Tree, California M5.7 117 km 6 km
Jun 29, 1992 3km ESE of Yucca Valley, California M5.7 111 km 10 km
Oct 16, 1999 7km ENE of Running Springs, CA M5.6 98 km 6 km
Jun 28, 1992 11km SSE of Big Bear Lake, California M5.5 94 km 10 km
Feb 28, 1990 The 1990 Upland, California Earthquake M5.5 96 km 3 km
Jun 28, 1992 0km E of Yucca Valley, CA M5.5 110 km 8 km
Jul 7, 2010 20km NNW of Borrego Springs, CA M5.4 69 km 12 km
Jun 28, 1992 26km NNW of Yucca Valley, CA M5.4 126 km 4 km
Oct 16, 1999 32km SSW of Ludlow, California M5.4 149 km 1 km
Jul 1, 1992 24km N of Yucca Valley, California M5.3 127 km 5 km
Nov 27, 1992 10km NNW of Big Bear City, California M5.3 111 km 0 km
Sep 15, 1992 9km SE of Yucca Valley, California M5.3 111 km 7 km
Dec 4, 1992 10km SE of Lucerne Valley, California M5.3 115 km 1 km
Jun 28, 1992 1km N of Big Bear Lake, California M5.3 102 km 7 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

92 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 14 injuries.

Date Rating Distance Path Fatalities
May 22, 2008 EF2 56 km 2.8 mi 0
Nov 7, 1966 EF2 72 km 0.2 mi 0
Jan 19, 2010 EF1 92 km 4.6 mi 0
Feb 19, 2005 EF1 13 km 2.8 mi 0
Nov 10, 2000 EF1 51 km 0.4 mi 0
Jan 29, 1998 EF1 37 km 0.5 mi 0
Jan 9, 1998 EF1 99 km 1.5 mi 0
Dec 21, 1997 EF1 79 km 1.0 mi 0
Nov 11, 1997 EF1 65 km 0.2 mi 0
Dec 22, 1996 EF1 73 km 0.1 mi 0
Jan 14, 1993 EF1 88 km 1.0 mi 0
Dec 7, 1992 EF1 84 km 0.1 mi 0
Dec 7, 1992 EF1 82 km 0.1 mi 0
Mar 27, 1991 EF1 79 km 3.0 mi 0
Mar 27, 1991 EF1 25 km 0.2 mi 0
Mar 19, 1991 EF1 70 km 1.0 mi 0
Mar 16, 1986 EF1 82 km 1.2 mi 0
Nov 9, 1982 EF1 48 km 0.2 mi 0
Feb 20, 1980 EF1 66 km 0.1 mi 0
Jan 31, 1979 EF1 74 km 2.0 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

2 tsunamis recorded within 500 km. Highest wave on record: 1.2 m (4 ft).

Year Location Cause Max Wave Deaths Distance
1862 S. CALIFORNIA Eruption + Earthquake 1.2 m — 75 km
1855 S. CALIFORNIA Eruption + Earthquake — — 115 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Salton Buttes (150 km).

Name Type Elevation Last Eruption Distance
Salton Buttes Lava dome(s) -40 m (-131 ft) 210 150 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: CEDAR (268,362 acres, 2003).

Year Name Acres Burned Distance
2003 CEDAR 268,362 64 km
2007 WITCH 167,551 54 km
2007 HARRIS 90,443 91 km
2003 OLD 90,180 97 km
2006 MILLARD 86,585 99 km
2002 PINES 65,407 65 km
2003 PARADISE 55,995 34 km
2003 GRAND PRIX 50,799 93 km
2007 POOMACHA 47,496 29 km
2006 ESPERANZA 40,566 63 km
2003 MINE/OTAY 37,232 91 km
2008 YELLOW 33,232 22 km
2020 APPLE 32,374 80 km
2015 LAKE 30,421 96 km
2008 FREEWAY COMPLEX 29,350 78 km
2022 FAIRVIEW 28,680 47 km
2013 MOUNTAIN 28,202 67 km
2007 SANTIAGO 27,605 56 km
1998 EDNA 27,561 62 km
2020 INDIA 24,193 19 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 57°F (14°C) 2.6 in Wettest
February 55°F (13°C) 2.5 in
March 56°F (13°C) 2.3 in
April 60°F (15°C) 1.1 in
May 63°F (17°C) 0.3 in
June 68°F (20°C) 0.1 in
July 74°F (23°C) 0.0 in Driest
August 75°F (24°C) 0.2 in Warmest
September 73°F (23°C) 0.4 in
October 67°F (20°C) 0.4 in
November 60°F (15°C) 1.5 in
December 55°F (13°C) 1.9 in Coldest

Fallbrook has a seasonal temperature swing of 21°F / from 55°F in December to 75°F in August. Total annual precipitation is 13.1 inches, with January being the wettest month (2.6") and July the driest (0.0").

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