Weather & Climate in Pleasant Hill, CA

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

Pleasant Hill enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 50°F in January while summers reach 73°F in July. 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 17.7 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 72 feet.

Temperature

50°F Jan (10°C) 73°F Jul (23°C)

Annual Average	62.4°F
	16% above US avg
January Average	50°F (10°C)
July Average	73°F (23°C)
Sunny Days	330 days/yr

Geography

Elevation	72 ft (22 m)
Area	7.1 sq mi (18.3 km²)
Population Density	4,850/sq mi
Coordinates	37.9542°N, 122.0758°W
Timezone	America/Los_Angeles
County	San Mateo County County
Nearest Airport	Metro Oakland International (OAK) 18 miles away

Precipitation & Snow

Annual Rainfall 17.7"

53% below US avg

Snowfall 0.0"

Wettest Month (Jan) 4.65"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	99.2 / 100
Social Vulnerability	20.5 / 100
Community Resilience	97.6 / 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

5,111 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	36 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	120 km	5 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	116 km	7 km
Aug 12, 1998	10 km SW of Ridgemark, California	M5.1	144 km	9 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	117 km	7 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	120 km	6 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	118 km	7 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	126 km	5 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	56 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	100 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	116 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	73 km	8 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	120 km	4 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	80 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	116 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	54 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	114 km	15 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	116 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	115 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	115 km	2 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	65 km	0.6 mi	0
Feb 7, 1978	EF2	99 km	1.9 mi	0
Jun 1, 1958	EF2	87 km	15.0 mi	0
Jan 11, 1951	EF2	65 km	5.7 mi	0
Mar 18, 2011	EF1	78 km	0.1 mi	0
Jan 23, 2010	EF1	28 km	1.6 mi	0
Mar 20, 2005	EF1	45 km	3.0 mi	0
Dec 5, 1998	EF1	78 km	1.5 mi	0
May 5, 1998	EF1	64 km	0.3 mi	0
Dec 23, 1996	EF1	82 km	6.0 mi	0
Feb 22, 1996	EF1	88 km	1.0 mi	0
Dec 2, 1992	EF1	88 km	7.5 mi	0
Dec 2, 1992	EF1	83 km	1.0 mi	0
Dec 2, 1992	EF1	93 km	3.0 mi	0
Apr 19, 1988	EF1	85 km	0.2 mi	0
Feb 27, 1983	EF1	78 km	0.8 mi	0
Jan 14, 1980	EF1	56 km	0.3 mi	0
May 31, 1967	EF1	68 km	0.1 mi	0
Nov 10, 1964	EF1	90 km	1.0 mi	0
Apr 1, 1958	EF1	44 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	28 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	104 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	54 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	47 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	85 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (128 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	128 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	72 km
2020	HENNESSEY	314,241	77 km
2018	COUNTY	92,450	81 km
2020	CZU AUG LIGHTNING	85,894	91 km
2020	GLASS	68,020	78 km
2017	NUNS	56,883	58 km
2017	ATLAS	51,664	48 km
2007	LICK	47,424	99 km
2004	RUMSEY	39,335	91 km
1999	SIXTEEN	37,162	97 km
2017	TUBBS	36,981	86 km
2006	CANYON	36,851	92 km
1988	MILLER	35,750	53 km
2024	CORRAL	16,138	65 km
2006	ZAM ASSIST	14,404	90 km
2009	CORRAL	12,006	65 km
1995	VISION	11,931	70 km
1985	LEXINGTON	11,550	91 km
2015	WRAGG	8,455	59 km
2009	LOCKHEED	8,287	98 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	50°F (10°C)	4.7 in	Wettest
February	51°F (11°C)	3.9 in
March	54°F (12°C)	3.2 in
April	57°F (14°C)	1.3 in
May	62°F (17°C)	0.5 in
June	67°F (19°C)	0.1 in
July	73°F (23°C)	0.0 in	Warmest, Driest
August	70°F (21°C)	0.1 in
September	68°F (20°C)	0.3 in
October	63°F (17°C)	1.2 in
November	54°F (12°C)	3.2 in
December	48°F (9°C)	3.3 in	Coldest

Pleasant Hill has a seasonal temperature swing of 26°F / from 48°F in December to 73°F in July. Total annual precipitation is 21.8 inches, with January being the wettest month (4.7") and July the driest (0.0").

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