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Topics / Climate / United States / California

Was September normal in California?

September 2026 · 58 counties · data family: climatedata.dev

Near normal

69.6°FStatewide average temperature, September 2026

-1.0°F against the 1991–2020 normal of 70.6°F
53rd warmest September of 132 since 1895
Of 58 counties: 2 much warmer, 13 warmer, 35 near normal, 8 cooler
Furthest above normal: Orange County (+1.4°F); furthest below: Glenn County (-3.8°F)
Precipitation 0.44 in, 157% of normal: near normal

Every California county, September 2026September 2026 by county: 2 much warmer, 13 warmer, 35 near normal, 8 cooler; furthest above normal Orange County (+1.4°F), furthest below Glenn County (-3.8°F).Choose a county to see its answer. The colour shows how far each county was from its own 1991–2020 normal.

+1 to +2°F 4
within 1°F 14
−1 to −2°F 20
−2 to −3°F 13
−3 to −4°F 7

Much warmer than normal 2
Warmer than normal 13
Near normal 35
Cooler than normal 8
Much cooler than normal 0

Every September since 1895, California statewideSeptember 2026 averaged 69.6°F, -1.0°F against the 1991–2020 normal: the 53rd warmest September of 132 since 1895.

Show the numbers (132 rows)

Year	September average
2026	69.6°F
2025	71.3°F
2024	72.5°F
2023	68.1°F
2022	73.8°F
2021	72.2°F
2020	74.0°F
2019	68.9°F
2018	71.1°F
2017	69.8°F
2016	69.5°F
2015	72.1°F
2014	72.2°F
2013	69.3°F
2012	73.1°F
2011	72.2°F
2010	70.4°F
2009	73.0°F
2008	71.8°F
2007	67.5°F
2006	69.5°F
2005	66.9°F
2004	69.4°F
2003	72.9°F
2002	70.9°F
2001	71.3°F
2000	69.1°F
1999	70.7°F
1998	69.2°F
1997	70.8°F
1996	68.4°F
1995	71.2°F
1994	69.8°F
1993	69.5°F
1992	70.8°F
1991	72.2°F
1990	69.9°F
1989	68.1°F
1988	69.4°F
1987	69.8°F
1986	63.5°F
1985	64.4°F
1984	72.2°F
1983	71.0°F
1982	67.1°F
1981	70.4°F
1980	68.6°F
1979	72.2°F
1978	66.7°F
1977	67.8°F
1976	68.0°F
1975	71.0°F
1974	71.8°F
1973	67.5°F
1972	66.6°F
1971	68.5°F
1970	67.7°F
1969	70.9°F
1968	69.1°F
1967	70.8°F
1966	69.0°F
1965	64.6°F
1964	66.9°F
1963	70.7°F
1962	69.6°F
1961	66.6°F
1960	70.8°F
1959	67.2°F
1958	70.4°F
1957	69.3°F
1956	70.2°F
1955	69.3°F
1954	67.4°F
1953	71.0°F
1952	70.6°F
1951	70.7°F
1950	67.7°F
1949	70.2°F
1948	68.3°F
1947	70.8°F
1946	68.6°F
1945	69.8°F
1944	69.7°F
1943	71.3°F
1942	67.5°F
1941	64.8°F
1940	66.6°F
1939	69.1°F
1938	70.4°F
1937	69.9°F
1936	69.0°F
1935	70.2°F
1934	69.4°F
1933	66.8°F
1932	70.9°F
1931	66.4°F
1930	65.0°F
1929	67.1°F
1928	68.9°F
1927	64.9°F
1926	65.4°F
1925	63.9°F
1924	68.3°F
1923	68.7°F
1922	71.3°F
1921	66.8°F
1920	66.1°F
1919	66.9°F
1918	68.0°F
1917	68.7°F
1916	66.8°F
1915	66.4°F
1914	66.2°F
1913	70.0°F
1912	65.8°F
1911	64.1°F
1910	67.4°F
1909	67.4°F
1908	67.3°F
1907	65.1°F
1906	68.0°F
1905	68.0°F
1904	68.8°F
1903	66.9°F
1902	69.0°F
1901	65.1°F
1900	63.8°F
1899	70.5°F
1898	68.1°F
1897	67.2°F
1896	66.4°F
1895	65.7°F

All 58 counties, September 2026

Record rank: 1 is the warmest September on record for that county.


1	Orange	74.4°F	+1.4°F	12 of 132	Much warmer than normal
2	San Diego	74.8°F	+1.2°F	16 of 132	Warmer than normal
3	Imperial	88.6°F	+1.1°F	20 of 132	Warmer than normal
4	Santa Barbara	68.6°F	+1.0°F	13 of 132	Much warmer than normal
5	Riverside	81.8°F	+0.7°F	23 of 132	Warmer than normal
6	Ventura	68.8°F	+0.5°F	17 of 132	Warmer than normal
7	San Francisco	63.8°F	+0.4°F	25 of 132	Warmer than normal
8	Marin	63.3°F	+0.3°F	30 of 132	Warmer than normal
9	San Bernardino	80.1°F	+0.3°F	32 of 132	Warmer than normal
10	Los Angeles	72.6°F	+0.0°F	28 of 132	Warmer than normal
11	Inyo	73.9°F	−0.2°F	40 of 132	Warmer than normal
12	Mono	55.9°F	−0.2°F	45 of 132	Near normal
13	San Mateo	63.8°F	−0.4°F	34 of 132	Warmer than normal
14	Monterey	67.6°F	−0.5°F	33 of 132	Warmer than normal
15	Alpine	54.9°F	−0.8°F	60 of 132	Near normal
16	Santa Cruz	64.4°F	−0.8°F	41 of 132	Warmer than normal
17	Madera	67.4°F	−0.9°F	53 of 132	Near normal
18	Stanislaus	71.9°F	−0.9°F	53 of 132	Near normal
19	Alameda	68.0°F	−1.0°F	55 of 132	Near normal
20	San Luis Obispo	68.4°F	−1.0°F	44 of 132	Warmer than normal
21	Santa Clara	67.5°F	−1.0°F	47 of 132	Near normal
22	Contra Costa	69.1°F	−1.1°F	63 of 132	Near normal
23	Humboldt	63.6°F	−1.1°F	55 of 132	Near normal
24	Kings	74.8°F	−1.1°F	53 of 132	Near normal
25	Merced	72.6°F	−1.1°F	53 of 132	Near normal
26	San Benito	68.9°F	−1.1°F	51 of 132	Near normal
27	San Joaquin	71.7°F	−1.1°F	59 of 132	Near normal
28	Tulare	65.6°F	−1.1°F	54 of 132	Near normal
29	Solano	70.0°F	−1.2°F	62 of 132	Near normal
30	Fresno	66.4°F	−1.3°F	60 of 132	Near normal
31	Mariposa	66.3°F	−1.3°F	63 of 132	Near normal
32	Napa	68.8°F	−1.3°F	71 of 132	Near normal
33	El Dorado	64.8°F	−1.4°F	66 of 132	Near normal
34	Tuolumne	60.8°F	−1.4°F	70 of 132	Near normal
35	Calaveras	68.9°F	−1.5°F	74 of 132	Near normal
36	Kern	72.8°F	−1.5°F	63 of 132	Near normal
37	Sonoma	64.4°F	−1.5°F	77 of 132	Near normal
38	Amador	68.2°F	−1.7°F	77 of 132	Near normal
39	Sierra	57.5°F	−2.0°F	74 of 132	Near normal
40	Yolo	71.1°F	−2.0°F	83 of 132	Near normal
41	Plumas	57.9°F	−2.1°F	76 of 132	Near normal
42	Sacramento	71.1°F	−2.1°F	85 of 132	Near normal
43	Yuba	70.2°F	−2.1°F	79 of 132	Near normal
44	Mendocino	63.8°F	−2.2°F	97 of 132	Cooler than normal
45	Placer	63.4°F	−2.3°F	83 of 132	Near normal
46	Sutter	71.8°F	−2.3°F	86 of 132	Near normal
47	Lassen	57.2°F	−2.4°F	78 of 132	Near normal
48	Nevada	62.0°F	−2.4°F	80 of 132	Near normal
49	Butte	69.2°F	−2.5°F	82 of 132	Near normal
50	Modoc	56.3°F	−2.7°F	81 of 132	Near normal
51	Trinity	62.6°F	−2.7°F	90 of 132	Cooler than normal
52	Tehama	68.1°F	−3.0°F	94 of 132	Cooler than normal
53	Del Norte	59.8°F	−3.1°F	111 of 132	Cooler than normal
54	Lake	65.7°F	−3.3°F	107 of 132	Cooler than normal
55	Siskiyou	58.3°F	−3.3°F	88 of 132	Near normal
56	Shasta	64.5°F	−3.4°F	94 of 132	Cooler than normal
57	Colusa	69.2°F	−3.7°F	109 of 132	Cooler than normal
58	Glenn	68.3°F	−3.8°F	111 of 132	Cooler than normal

Get this data

This page's numbers, as JSON:

curl https://visualizedata.org/data/topics/climate/us-ca.json

The climatedata.dev API it comes from (live, no key; every month since 1895 with its normal, anomaly and rank):

curl "https://api.climatedata.dev/v1/us-climate/tavg/us-ca.json"

Open the JSON

What this can't tell you

A statewide average is not the average of its counties: NOAA computes it from its own grid, weighted by area.
The most recent months are preliminary and NOAA revises them in the next release.

How the answer is decided

Each month is ranked against the same month in every year on record (since 1895 for most places). The top tenth of the record is 'much warmer than normal', the top third 'warmer', the middle third 'near normal'. Counties are coloured by the same five words.

Sources

climatedata.dev us-climate, version 2026-10-25.6c7474e6d8 (U.S. public domain)
NOAA Monthly U.S. Climate Divisional Database (nClimDiv), statewide and national files (U.S. public domain)
climatedata.dev county-climate, version 2026-10-25.b4bbb5298a (U.S. public domain)
U.S. Census Bureau TIGERweb, counties (generalised) (U.S. public domain)
Built 2026-10-26. Download every county's answer (JSON)

Every topic for one county: How's Hennepin County?