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Weather & Climate in Granite Bay, CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Granite Bay enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 47°F in January while summers reach 78°F in July. The area gets 302 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 36.1 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 400 feet.
Temperature
47°F Jan (8°C)
78°F Jul (26°C)
| Annual Average | 61.2°F |
| 13% above US avg | |
| January Average | 47°F (8°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 400 ft (122 m) |
| Area | 21.6 sq mi (55.9 km²) |
| Population Density | 992/sq mi |
| Coordinates | 38.7604°N, 121.1682°W |
| Timezone | America/Los_Angeles |
| County | Sacramento County County |
| Nearest Airport | Sacramento International (SMF) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.1 / 100 |
| Social Vulnerability | 37.4 / 100 |
| Community Resilience | 57.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
| Volcano | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
5,231 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.1.
| Sep 12, 1994 | 4 km S of Carter Springs, Nevada | M6.1 | 132 km | 14 km |
| Aug 24, 2014 | The 2014 South Napa, California Earthquake | M6.0 | 117 km | 11 km |
| Jul 8, 2021 | Antelope Valley, CA | M6.0 | 148 km | 7 km |
| Aug 10, 2001 | 3 km N of Blairsden, California | M5.2 | 126 km | 5 km |
| Sep 12, 1994 | 8 km ESE of Mesa Vista, California | M5.1 | 127 km | -1 km |
| Apr 26, 2008 | 1 km NW of Mogul, Nevada | M5.1 | 136 km | 3 km |
| Jul 8, 2021 | 32km SE of Markleeville, CA | M5.0 | 147 km | 7 km |
| Sep 3, 2000 | 5 km WSW of Yountville, California | M4.9 | 116 km | 9 km |
| Dec 22, 1995 | California-Nevada border region | M4.9 | 133 km | 4 km |
| Apr 26, 2008 | 0 km N of Mogul, Nevada | M4.8 | 136 km | 3 km |
| Oct 30, 1998 | 4 km N of Tahoe Vista, California | M4.8 | 113 km | 1 km |
| Sep 4, 1995 | 13 km SW of Middletown, California | M4.8 | 137 km | 7 km |
| Dec 28, 1995 | 9 km WNW of Topaz Lake, Nevada | M4.8 | 131 km | -1 km |
| Jun 26, 2005 | 8 km NNW of Tahoe Vista, California | M4.8 | 111 km | -2 km |
| May 12, 2006 | 7 km W of Cobb, California | M4.7 | 143 km | 4 km |
| Dec 23, 1995 | 8 km WNW of Topaz Lake, Nevada | M4.7 | 133 km | -1 km |
| Jan 2, 2025 | 4 km NW of Cobb, CA | M4.7 | 138 km | 1 km |
| May 7, 2021 | 19km NW of Truckee, CA | M4.7 | 107 km | 10 km |
| Jul 8, 2021 | 29km ENE of Dardanelle, CA | M4.6 | 144 km | 2 km |
| Dec 12, 1996 | 4 km SSW of Topaz Lake, Nevada | M4.6 | 140 km | -2 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
70 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 7 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Feb 10, 1994 | EF2 | 91 km | 0.3 mi | 0 |
| Feb 7, 1978 | EF2 | 25 km | 1.9 mi | 0 |
| Jan 10, 2023 | EF1 | 83 km | 0.4 mi | 0 |
| Dec 24, 2015 | EF1 | 8 km | 6.2 mi | 0 |
| Oct 22, 2012 | EF1 | 32 km | 4.0 mi | 0 |
| Oct 22, 2012 | EF1 | 47 km | 0.3 mi | 0 |
| Oct 22, 2012 | EF1 | 52 km | 2.0 mi | 0 |
| Jan 8, 2005 | EF1 | 84 km | 0.1 mi | 0 |
| Jan 7, 1993 | EF1 | 87 km | 0.1 mi | 0 |
| Dec 17, 1992 | EF1 | 65 km | 5.0 mi | 0 |
| Dec 17, 1992 | EF1 | 91 km | 1.0 mi | 0 |
| Apr 19, 1988 | EF1 | 9 km | 1.0 mi | 0 |
| Apr 19, 1988 | EF1 | 66 km | 0.2 mi | 0 |
| Mar 22, 1983 | EF1 | 16 km | 2.0 mi | 0 |
| Jun 28, 1970 | EF1 | 85 km | 2.3 mi | 0 |
| May 31, 1967 | EF1 | 89 km | 0.1 mi | 0 |
| Jan 14, 2023 | EF0 | 49 km | 0.3 mi | 0 |
| Nov 8, 2022 | EF0 | 50 km | 0.8 mi | 0 |
| Nov 18, 2020 | EF0 | 21 km | 4.4 mi | 0 |
| May 18, 2020 | EF0 | 42 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami 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 | 143 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Clear Lake (141 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 141 km |
| Lassen Volcanic Center | Stratovolcano | 3,187 m (10,456 ft) | 1917 | 195 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: HENNESSEY (314,241 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | HENNESSEY | 314,241 | 98 km |
| 2021 | CALDOR | 226,583 | 76 km |
| 2014 | KING | 99,070 | 57 km |
| 2018 | COUNTY | 92,450 | 86 km |
| 2022 | MOSQUITO | 77,858 | 52 km |
| 2015 | BUTTE | 72,894 | 74 km |
| 2004 | RUMSEY | 39,335 | 96 km |
| 1988 | 49R | 36,673 | 54 km |
| 1988 | MILLER | 35,750 | 89 km |
| 2013 | AMERICAN | 27,938 | 65 km |
| 1992 | CLEVELAND | 21,835 | 64 km |
| 2008 | AMERICAN RIVER COMPLEX (GOVERNMENT) | 20,709 | 70 km |
| 1992 | GULCH | 18,019 | 88 km |
| 2004 | POWER | 17,266 | 82 km |
| 2001 | STAR | 16,846 | 70 km |
| 2017 | CASCADE | 16,155 | 69 km |
| 2001 | DARBY | 14,734 | 98 km |
| 2006 | ZAM ASSIST | 14,404 | 64 km |
| 2018 | WAVERLY | 12,238 | 89 km |
| 1996 | SCOTT | 8,828 | 24 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 47°F (8°C) | 4.1 in | Wettest |
| February | 52°F (11°C) | 3.3 in | |
| March | 55°F (13°C) | 3.2 in | |
| April | 60°F (15°C) | 1.7 in | |
| May | 67°F (19°C) | 0.4 in | |
| June | 74°F (23°C) | 0.2 in | |
| July | 78°F (26°C) | 0.1 in | Warmest, Driest |
| August | 77°F (25°C) | 0.1 in | |
| September | 73°F (23°C) | 0.4 in | |
| October | 65°F (18°C) | 1.5 in | |
| November | 53°F (12°C) | 3.7 in | |
| December | 46°F (8°C) | 3.2 in | Coldest |
Granite Bay has a seasonal temperature swing of 32°F / from 46°F in December to 78°F in July. Total annual precipitation is 21.7 inches, with January being the wettest month (4.1") and July the driest (0.1").