Weather & Climate in Piedmont, CA

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

Piedmont enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 53°F in January while summers reach 64°F in July / relatively mild seasonal variation. The area gets 323 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 22.6 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 333 feet.

Temperature

53°F Jan (11°C) 64°F Jul (18°C)

Annual Average	59.6°F
	10% above US avg
January Average	53°F (11°C)
July Average	64°F (18°C)
Sunny Days	323 days/yr

Geography

Elevation	333 ft (101 m)
Area	1.7 sq mi (4.4 km²)
Population Density	6,478/sq mi
Coordinates	37.8225°N, 122.2300°W
Timezone	America/Los_Angeles
County	San Mateo County County
Nearest Airport	Metro Oakland International (OAK) 7 miles away

Precipitation & Snow

Annual Rainfall 22.6"

41% below US avg

Snowfall 0.0"

Wettest Month (Jan) 4.72"

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

5,273 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	44 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	111 km	5 km
Aug 12, 1998	10 km SW of Ridgemark, California	M5.1	137 km	9 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	108 km	7 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	112 km	7 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	64 km	9 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	118 km	5 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	111 km	6 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	110 km	7 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	106 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	122 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	68 km	8 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	112 km	4 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	75 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	123 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	41 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	105 km	15 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	121 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	122 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	122 km	2 km

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

Tornado History

60 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 9 injuries.

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	53 km	0.6 mi	0
Jun 1, 1958	EF2	83 km	15.0 mi	0
Jan 11, 1951	EF2	51 km	5.7 mi	0
Dec 14, 2024	EF1	88 km	0.3 mi	0
Mar 18, 2011	EF1	82 km	0.1 mi	0
Jan 23, 2010	EF1	42 km	1.6 mi	0
Mar 20, 2005	EF1	25 km	3.0 mi	0
Dec 5, 1998	EF1	81 km	1.5 mi	0
May 5, 1998	EF1	50 km	0.3 mi	0
Dec 23, 1996	EF1	78 km	6.0 mi	0
Feb 22, 1996	EF1	92 km	1.0 mi	0
Dec 2, 1992	EF1	87 km	7.5 mi	0
Dec 2, 1992	EF1	96 km	3.0 mi	0
Dec 2, 1992	EF1	83 km	1.0 mi	0
Feb 27, 1983	EF1	81 km	0.8 mi	0
Jan 14, 1980	EF1	49 km	0.3 mi	0
May 31, 1967	EF1	83 km	0.1 mi	0
Nov 10, 1964	EF1	93 km	1.0 mi	0
Apr 1, 1958	EF1	25 km	0.2 mi	0
Nov 8, 2022	EF0	98 km	0.8 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	18 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	93 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	36 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	27 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	75 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (136 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	136 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	74 km
2020	HENNESSEY	314,241	89 km
2018	COUNTY	92,450	96 km
2020	CZU AUG LIGHTNING	85,894	75 km
2020	GLASS	68,020	86 km
2017	NUNS	56,883	63 km
2017	ATLAS	51,664	60 km
2007	LICK	47,424	97 km
2017	TUBBS	36,981	92 km
2006	CANYON	36,851	93 km
1988	MILLER	35,750	69 km
2024	CORRAL	16,138	71 km
2009	CORRAL	12,006	70 km
1995	VISION	11,931	61 km
1985	LEXINGTON	11,550	80 km
2015	WRAGG	8,455	75 km
2009	LOCKHEED	8,287	82 km
2003	BIRD	7,727	84 km
2014	MONTICELLO	6,984	81 km
1984	SITE 300 3	6,911	69 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	53°F (11°C)	4.7 in	Wettest
February	53°F (12°C)	4.1 in
March	55°F (13°C)	3.5 in
April	58°F (14°C)	1.4 in
May	61°F (16°C)	0.5 in
June	64°F (18°C)	0.2 in
July	64°F (18°C)	0.0 in	Driest
August	66°F (19°C)	0.1 in
September	66°F (19°C)	0.3 in	Warmest
October	63°F (17°C)	1.3 in
November	56°F (13°C)	3.2 in
December	50°F (10°C)	3.3 in	Coldest

Piedmont has a seasonal temperature swing of 16°F / from 50°F in December to 66°F in September. Total annual precipitation is 22.5 inches, with January being the wettest month (4.7") and July the driest (0.0").

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