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Weather & Climate in Rialto, CA

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

Rialto enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 49°F in January while summers reach 82°F in July. The area gets 332 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 37.7 inches. The area receives 5.8 inches of snow annually. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 1,348 feet.

Temperature

49°F Jan (9°C) 82°F Jul (28°C)
Annual Average62.7°F
16% above US avg
January Average49°F (9°C)
July Average82°F (28°C)
Sunny Days332 days/yr

Geography

Elevation1,348 ft (411 m)
Area24.1 sq mi (62.4 km²)
Population Density4,312/sq mi
Coordinates34.1174°N, 117.3892°W
TimezoneAmerica/Los_Angeles
CountyOrange County County
Nearest AirportSan Bernardino International (SBD)
9 miles away

Precipitation & Snow

Annual Rainfall 37.7"
1% below US avg
Snowfall 5.8"
Wettest Month (Feb) 2.80"
Driest Month (Jun) 0.08"

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

13,576 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.3.

Jun 28, 1992 The 1992 Landers, California Earthquake M7.3 88 km 0 km
Oct 16, 1999 The 1999 Hector Mine, California Earthquake M7.1 117 km 14 km
Jan 17, 1994 Northridge, California, earthquake M6.7 106 km 18 km
Jun 28, 1992 The 1992 Big Bear, California Earthquake M6.3 53 km 4 km
Apr 23, 1992 The 1992 Joshua Tree, California Earthquake M6.1 100 km 12 km
Jan 17, 1994 1km ENE of Granada Hills, California M5.9 103 km 5 km
Jun 28, 1991 The 1991 Sierra Madre, California Earthquake M5.8 58 km 8 km
Oct 16, 1999 13km WSW of Ludlow, CA M5.8 119 km 14 km
Jun 28, 1992 3km NE of Yucca Valley, California M5.8 90 km -1 km
Jun 28, 1992 2km SSW of Joshua Tree, California M5.7 98 km 6 km
Jun 29, 1992 3km ESE of Yucca Valley, California M5.7 91 km 10 km
Jul 11, 1992 12km NW of California City, California M5.7 136 km 10 km
Oct 16, 1999 7km ENE of Running Springs, CA M5.6 35 km 6 km
Jan 17, 1994 7km NNE of Simi Valley, California M5.6 123 km 9 km
Jun 28, 1992 11km SSE of Big Bear Lake, California M5.5 50 km 10 km
Feb 28, 1990 The 1990 Upland, California Earthquake M5.5 29 km 3 km
Jun 28, 1992 0km E of Yucca Valley, CA M5.5 89 km 8 km
Jul 5, 1992 21km SW of Ludlow, California M5.4 111 km 5 km
Jul 7, 2010 20km NNW of Borrego Springs, CA M5.4 115 km 12 km
Jun 28, 1992 26km NNW of Yucca Valley, CA M5.4 85 km 4 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

126 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 58 injuries.

Date Rating Distance Path Fatalities
May 22, 2008 EF2 29 km 2.8 mi 0
Mar 1, 1983 EF2 92 km 3.5 mi 0
Nov 9, 1982 EF2 84 km 10.0 mi 0
Nov 9, 1982 EF2 98 km 1.0 mi 0
Sep 7, 1982 EF2 95 km 0.5 mi 0
Nov 7, 1966 EF2 92 km 10.3 mi 0
Nov 7, 1966 EF2 87 km 0.1 mi 0
Nov 7, 1966 EF2 71 km 0.2 mi 0
Jun 25, 1954 EF2 60 km 0.1 mi 0
Mar 22, 2023 EF1 69 km 0.5 mi 0
Jan 19, 2010 EF1 81 km 4.6 mi 0
Aug 4, 2008 EF1 78 km 1.1 mi 0
Feb 19, 2005 EF1 74 km 2.8 mi 0
Jan 9, 1998 EF1 81 km 1.5 mi 0
Dec 21, 1997 EF1 75 km 1.0 mi 0
Nov 11, 1997 EF1 63 km 0.2 mi 0
May 18, 1997 EF1 59 km 3.5 mi 0
May 18, 1997 EF1 57 km 9.0 mi 0
May 11, 1997 EF1 48 km 0.2 mi 0
Dec 22, 1996 EF1 60 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

3 tsunamis recorded within 500 km. Highest wave on record: 3.1 m (10 ft).

Year Location Cause Max Wave Deaths Distance
1930 S. CALIFORNIA Eruption + Earthquake 3.1 m 1 116 km
1994 WEST COAST, USA Earthquake 0.1 m 57 106 km
1855 S. CALIFORNIA Eruption + Earthquake — — 66 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Salton Buttes (193 km).

Name Type Elevation Last Eruption Distance
Salton Buttes Lava dome(s) -40 m (-131 ft) 210 193 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: STATION (165,368 acres, 2009).

Year Name Acres Burned Distance
2009 STATION 165,368 73 km
2020 BOBCAT 115,728 55 km
2003 OLD 90,180 17 km
2006 MILLARD 86,585 71 km
1999 WILLOW 63,525 36 km
2003 GRAND PRIX 50,799 11 km
2016 SAND 41,561 93 km
2006 ESPERANZA 40,566 55 km
2002 WILLIAMS 37,505 37 km
2016 BLUE CUT 36,856 25 km
2008 YELLOW 33,232 81 km
2020 APPLE 32,374 49 km
2015 LAKE 30,421 58 km
2008 FREEWAY COMPLEX 29,350 40 km
2022 FAIRVIEW 28,680 69 km
2013 MOUNTAIN 28,202 82 km
2007 SANTIAGO 27,605 51 km
1998 EDNA 27,561 44 km
2020 INDIA 24,193 79 km
1993 CALIFORNIA 23,899 63 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 49°F (9°C) 2.7 in Coldest
February 56°F (13°C) 2.8 in Wettest
March 57°F (14°C) 2.5 in
April 62°F (16°C) 0.9 in
May 66°F (19°C) 0.3 in
June 72°F (22°C) 0.1 in Driest
July 82°F (28°C) 0.1 in Warmest
August 78°F (26°C) 0.2 in
September 75°F (24°C) 0.4 in
October 68°F (20°C) 0.4 in
November 60°F (15°C) 1.3 in
December 54°F (12°C) 1.7 in

Rialto has a seasonal temperature swing of 33°F / from 49°F in January to 82°F in July. Total annual precipitation is 13.3 inches, with February being the wettest month (2.8") and June the driest (0.1").

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