Riverside, CA: September

30 September 2026: September 2026 averaged 78.1°F in Riverside, CA, the warmest September since 2022, tied 11th warmest of 122 (with 2002).

September 2026

Mean temperature: 78.1°F; Warmest since 2022; 11th warmest of 122
Precipitation: 0.36 in; Wettest since 2015; 18th wettest of 121

A normal September in Riverside, CA (1991 to 2020): 0.00 in of precipitation, between 0.00 in and 0.22 in in eight years of ten.

The mean temperature of every September in Riverside, CA since 1893: 78.1°F in 2026; the highest is 81.8°F, in 1984.

Every year, ranked, as a table

Every September in Riverside, CA from 1893 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank	Days missing
2026	78.1	11	90.8	72	65.3	7	0.36	18	0
2025	77.9	13	90.4	82	65.4	6	0.05	38	0
2024	77.6	16	92.4	44	62.8	16	trace	57	0
2023	73.5	66	84.9	120	62.1	24	0.31	19	0
2022	81.6	2	95	16	68.3	1	0.14	33	0
2021	76.9	25	91.3	59	62.5	18	trace	57	0
2020	80.4	6	97.2	4	63.6	12	0.00	72	0
2019	77.3	21	91.7	52	62.9	15	0.01	52	0
2018	77	23	92.2	46	61.9	28	0.00	72	0
2017	76.3	36	89.4	93	63.1	14	0.22	25	0
2016	76.4	32	90.6	75	62.2	23	trace	57	0
2015	80.6	5	93.8	26	67.3	2	1.87	3	0
2014	79.8	7	93.7	27	65.9	5	0.23	24	0
2013	77.9	13	91.9	50	63.8	11	0.00	72	0
2012	81.3	3	96.3	8	66.2	4	trace	57	0
2011	76.4	32	90.6	75	62.1	24	0.04	42	0
2010	76.4	32	92.6	40	60.3	39	0.01	52	0
2009	79.5	9	94.9	17	64	10	0.00	72	0
2008							0.00	72	9
2007	76.4	32	91.5	54	61.3	31	0.18	29	3
2006	77.1	22	93.7	27	60.5	36	0.00	72	3
2005							0.00	72	10
2004					61.7	29	0.00	72	4
2003			94.1	25	62.4	19	0.00	72	4
2002	78.1	11	93.2	31	62.3	21	0.00	72	1
2001	76.7	29	93	33	60.4	37	0.00	72	2
2000			93.2	31			0.00	72	4
1999	74.1	60	89.1	95	59	46	0.00	72	0
1998	74.7	54	87.3	107	62.3	21	0.00	72	3
1997	80.7	4	96.4	7	65	8	0.66	11	0
1996			90.5	79			0.00	72	4
1995	79	10	95.3	15	62.6	17	0.00	72	0
1994	76.5	31	92.3	45	60.7	35	0.00	72	1
1993	76.8	27	93.7	27	59.8	45	0.00	72	3
1991	77.5	17	92.6	40	62.4	19	trace	57	0
1990	77.4	19	92.6	40	62.1	24	0.00	72	1
1989	75.8	42	93.3	30	58.1	51	0.39	17	2
1988	74.8	52	90	85	60	43	0.05	38	1
1987	77	23	93	33	61.1	33	0.19	28	0
1986	68.3	119	84	123	52.6	96	0.30	20	1
1985	71.7	91	86.3	111	57.1	57	0.29	22	1
1984	81.8	1	97.6	2	66.4	3	0.16	31	1
1983	77.8	15	91.6	53	64.3	9	0.64	12	1
1982	75.3	46	89.2	94	61.3	31	0.74	9	1
1981	75.7	43	90.9	69	60.4	37	0.41	16	0
1980	74	61	89.7	90	58.4	50	0.00	72	0
1979	79.6	8	97.6	2	61.6	30	trace	57	0
1978	74.9	50	89.8	89	60.1	41	1.15	5	0
1977	72.4	79	87.1	108	57.7	53	0.00	72	0
1976	72.9	73	83.8	125	62.1	24	2.03	2	0
1975	75.1	48	91.5	54	58.8	48	0.05	38	0
1974	76	39	92.1	47	60	43	0.00	72	1
1973	69.6	110	83.9	124	55.3	73	0.00	72	0
1972	71.9	90	86.1	113	57.7	53	0.01	52	0
1971	74.8	52	90.6	75	58.9	47	0.00	72	0
1970	72.2	84	91.2	60	53.3	92	0.00	72	0
1969	74.9	50	91.2	60	58.6	49	0.00	72	0
1968	73.3	68	89.7	90	57	59	0.00	72	0
1967	75.5	44	88.4	101	63.2	13	0.06	36	2
1966	74.3	57	91.4	56	57.1	57	0.04	42	2
1965	70	107	85	119	54.9	74	0.74	9	0
1964	71.1	96	88.5	98	53.9	87	0.21	27	1
1963	76.6	30	92.9	36	60.3	39	3.91	1	0
1962	73.3	68	91.1	62	55.4	72	0.00	72	0
1961	71.5	92	87.5	106	55.5	71	0.00	72	1
1960	77.5	17	94.9	17	60.1	41	trace	57	0
1959	72.3	81	86.5	109	58	52	0.02	48	0
1958	76	39	94.7	19	57.2	55	0.26	23	1
1957	72.7	75	90.5	79	54.9	74	0.00	72	1
1956	76.9	25	97.1	5	56.7	62	0.00	72	1
1955	76.1	38	95.4	14	56.9	60	0.00	72	1
1954	73.2	70	92.9	36	53.5	90	0.00	72	0
1953	70.9	100	90.2	83	51.5	107	0.00	72	0
1952	74.6	56	93	33	56.2	66	0.51	14	0
1951	72.1	86	91.1	62	53.2	93	0.18	29	0
1950	68.7	117	85.8	116	51.5	107	0.03	45	0
1949	73.1	71	94.2	23	52	103	0.00	72	0
1948	72.7	75	92.8	39	52.5	98	0.00	72	0
1947	74.7	54	94.7	19	54.7	77	0.03	45	3
1946	75	49	95.8	12	54.2	82	0.15	32	0
1945	74.2	58	91.8	51	56.6	63	0.07	35	0
1944	72.7	75	89.6	92	55.8	68	0.00	72	0
1943	75.2	47	96.3	8	54	84	0.00	72	0
1942	71.2	95	90.9	69	51.6	106	0.00	72	0
1941	68.4	118	86.1	113	50.7	113	0.00	72	0
1940	72.3	81	91.1	62	53.6	89	0.00	72	0
1939	76.8	27	92.9	36	60.8	34	1.19	4	0
1938	76.3	36	95.7	13	56.9	60	0.00	72	0
1937	75.9	41	94.5	21	57.2	55	0.02	48	0
1936	73.5	66	92.6	40	54.4	79	trace	57	0
1935	73	72	92.1	47	54	84	trace	57	0
1934	72.8	74	91.1	62	54.4	79	0.05	38	0
1933	67.7	121	85.7	117	49.9	121	0.01	52	1
1932	72	87	90.7	74	53.4	91	0.04	42	0
1931	70.7	102	87.8	103	53.7	88	0.22	25	0
1930	68.8	116	86.4	110	51.3	110	0.00	72	0
1929	70.9	100	85.9	115	55.8	68	0.63	13	0
1928	73.8	62	94.2	23	52.8	95	trace	57	1
1927	69.4	112	86.2	112	52.6	96	trace	57	0
1926	71.1	96	91.4	56	50.7	113	0.00	72	0
1925	70.7	102	91	66	50.4	117	0.00	72	0
1924	73.8	62	95.9	11	51.8	105	0.00	72	0
1923	73.7	64	91	66	56.3	65	0.03	45	0
1922	77.4	19	98.4	1	56.4	64	0.00	72	0
1921	72	87	92.1	47	51.3	110			1
1920	71.3	94	90	85	52.5	98	0.06	36	0
1919	71.1	96	90.5	79	52	103			1
1918	72.7	75	89.9	88	55.6	70	0.30	20	0
1917	73.6	65	97.1	5	50	120			0
1916	69.6	110	90.6	75	48.6	123	0.99	6	0
1915	69.4	112	88.6	97	50.2	118	trace	57	0
1914	72.2	84	90.2	83	54.1	83	0.02	48	0
1913	75.4	45	96.3	8	54.4	79			0
1912	70.4	104	90.8	72	50.1	119	0.01	52	0
1911	70.2	106	91	66	49.4	122	0.75	8	0
1910	74.2	58	94.4	22	54	84	0.00	72	0
1909	71.1	96	87.7	104	54.5	78	0.00	72	0
1908	72.4	79	90	85	54.8	76	0.77	7	0
1907	69.4	112	87.6	105	51.1	112	0.00	72	0
1906	69.9	108	88.3	102	51.4	109	0.02	48	0
1905	69.7	109	88.7	96	50.6	116	0.08	34	0
1904	72.3	81	88.5	98	55.9	67	trace	57	1
1903	69.4	112	85.6	118	53.1	94	0.43	15	0
1902	70.4	104	88.5	98	52.4	101	trace	57	1
1901	66.7	122	84.7	122	48.6	123	trace	57	3
1895	71.5	92	90.9	69	52.1	102			0
1894	72	87	91.4	56	52.5	98			0
1893	67.8	120	84.9	120	50.7	113			0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1984	81.8
2022	81.6
2012	81.3
1997	80.7
2015	80.6
2020	80.4
2014	79.8
1979	79.6
2009	79.5
1995	79

Coldest
Year	Mean, °F
1901	66.7
1933	67.7
1893	67.8
1986	68.3
1941	68.4
1950	68.7
1930	68.8
1927	69.4
1915	69.4
1907	69.4
More years share the last value

Wettest
Year	Precipitation, in
1963	3.91
1976	2.03
2015	1.87
1939	1.19
1978	1.15
1916	0.99
1908	0.77
1911	0.75
1982	0.74
1965	0.74

Driest
Year	Precipitation, in
2020	0.00
2018	0.00
2013	0.00
2009	0.00
2008	0.00
2006	0.00
2005	0.00
2004	0.00
2003	0.00
2002	0.00
More years share the last value

The hottest, coldest and wettest days

Hottest day: 110°F; 9 September 2026
Coldest night: 59°F; 29 September 2026, 5 September 2026
Wettest day: 0.35 in; 6 September 2026

Every month, season and year

Months

Seasons

Years

Riverside, CA the day's answers

All-time records

Every answer in words

September 2026 brought 0.36 in of precipitation in Riverside, CA, the wettest September since 2015, 18th wettest of 121.
The hottest day of September 2026 in Riverside, CA: 110°F on Wednesday 9 September 2026.
The coldest night of September 2026 in Riverside, CA: a low of 59°F on Tuesday 29 September 2026 and Saturday 5 September 2026.
The wettest day of September 2026 in Riverside, CA: 0.35 in on Sunday 6 September 2026.