Average September Temperature in Riverside by Year

This page contains a list of the average monthly high and low temperatures in Riverside, California for the month of September each year between 1893 and 2023. It is based on NOAA data.

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What Was the Hottest September Ever in Riverside?

1984 was the warmest September in the history of Riverside, California. The average daily high temperature was 97.5 °F, and the average low was 66.4 °F.

What Was the Coldest September Ever in Riverside?

1901 was the coolest September in the history of Riverside, California. The average daily high temperature was 85.2 °F, and the average low was 49.0 °F.

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Year	Rank	High (°F)	Low (°F)
2023	65	84.9	62.1
2022	2	95.0	68.3
2021	21	91.3	62.5
2020	6	97.2	63.6
2019	17	91.7	62.9
2018	20	92.2	61.9
2017	32	89.4	63.1
2016	29	90.6	62.2
2015	5	93.8	67.3
2014	7	93.7	65.9
2013	13	92.0	63.8
2012	3	96.3	66.2
2011	30	90.6	62.1
2010	28	92.6	60.3
2009	9	94.9	64.0
2008	11	93.5	63.6
2006	58	91.1	57.2
2005	94	87.6	55.3
2004	41	91.2	59.6
2003	27	93.1	59.9
2002	38	92.0	59.5
2001	54	91.6	57.2
2000	59	90.1	58.1
1999	78	87.7	57.7
1998	48	87.7	62.2
1997	4	96.4	65.0
1995	10	95.3	62.6
1994	26	92.3	60.7
1993	24	93.6	59.9
1991	15	92.6	62.4
1990	18	92.6	62.0
1989	39	93.3	58.1
1988	46	90.2	60.0
1987	19	93.0	61.1
1986	119	84.1	52.8
1985	91	86.5	57.1
1984	1	97.5	66.4
1983	12	91.6	64.3
1982	43	89.3	61.3
1981	40	90.9	60.4
1980	60	89.7	58.4
1979	8	97.6	61.6
1978	50	89.8	60.0
1977	79	87.1	57.7
1976	72	83.8	62.1
1975	45	91.5	58.8
1974	33	92.1	60.0
1973	111	83.9	55.3
1972	89	86.1	57.7
1971	52	90.6	58.9
1970	84	91.2	53.3
1969	51	91.2	58.6
1968	67	89.7	57.0
1967	36	88.7	63.2
1966	55	91.5	57.1
1965	108	85.0	54.9
1964	97	88.5	53.9
1963	25	92.9	60.3
1962	68	91.1	55.4
1961	92	87.7	55.5
1960	14	94.9	60.1
1959	83	86.5	58.0
1958	35	94.7	57.2
1957	75	90.5	54.9
1956	22	97.0	56.7
1955	34	95.2	56.9
1954	69	92.9	53.5
1953	101	90.2	51.5
1952	53	93.0	56.2
1951	86	91.1	53.2
1950	118	85.8	51.5
1949	70	94.2	52.0
1948	77	92.8	52.5
1947	47	94.7	55.4
1946	49	95.8	54.2
1945	56	91.8	56.6
1944	76	89.6	55.8
1943	44	96.3	54.0
1942	96	90.8	51.6
1941	120	86.1	50.7
1940	81	91.1	53.6
1939	23	92.9	60.8
1938	31	95.7	56.9
1937	37	94.5	57.2
1936	66	92.6	54.4
1935	71	92.1	54.0
1934	73	91.1	54.4
1933	121	85.9	49.9
1932	87	90.7	53.4
1931	103	87.8	53.6
1930	117	86.4	51.3
1929	102	85.9	55.8
1928	62	94.3	53.1
1927	113	86.2	52.6
1926	100	91.4	50.7
1925	104	91.0	50.4
1924	61	95.9	51.8
1923	63	91.0	56.3
1922	16	98.4	56.4
1921	90	92.1	51.5
1920	95	90.0	52.5
1919	98	90.4	52.0
1918	74	89.9	55.6
1917	64	97.1	50.0
1916	112	90.6	48.6
1915	114	88.6	50.2
1914	85	90.2	54.1
1913	42	96.3	54.4
1912	106	90.8	50.1
1911	107	91.0	49.4
1910	57	94.4	54.0
1909	99	87.6	54.5
1908	80	90.0	54.8
1907	115	87.6	51.1
1906	109	88.3	51.4
1905	110	88.7	50.6
1904	82	88.5	56.1
1903	116	85.6	53.0
1902	105	88.5	52.7
1901	123	85.2	49.0
1895	93	91.0	52.1
1894	88	91.4	52.6
1893	122	84.9	50.7

Weather Station Details

Years	Station	Coordinates
1999–2024	Riverside Municipal Airport	location
1893–1998	Riverside Fire Station	location