Riverside, CA: May

31 May 2026: May 2026 averaged 68.1°F in Riverside, CA, the warmest May since 2025, tied 22nd warmest of 120 (with 1983).

May 2026

Mean temperature: 68.1°F; Warmest since 2025; 22nd warmest of 120
Precipitation: 0.11 in; Wettest since 2025; 52nd wettest of 121

A normal May in Riverside, CA (1991 to 2020): 0.04 in of precipitation, between 0.00 in and 0.41 in in eight years of ten.

The mean temperature of every May in Riverside, CA since 1893: 68.1°F in 2026; the highest is 74.5°F, in 1997.

Every year, ranked, as a table

Every May 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	68.1	22	80.7	56	55.5	17	0.11	52	0
2025	69.5	14	82	39	57.1	8	0.48	15	0
2024	65.2	71	76.7	100	53.8	32	0.12	50	0
2023	64.9	75	75.6	106	54.2	28	0.47	16	0
2022	68	24	81	48	55	21	trace	83	0
2021	67.5	34	79.8	65	55.3	18	trace	83	0
2020	71.3	5	85.5	5	57	9	trace	83	0
2019	63.2	94	73.9	120	52.6	47	0.44	17	0
2018	66.3	52	77.5	91	55.1	20	0.15	46	0
2017	68	24	80.9	52	55	21	0.02	77	0
2016	67.1	42	78.1	83	56.1	14	0.18	38	0
2015	65.6	64	76	103	55.2	19	0.60	10	0
2014	71.8	3	85.5	5	58	3	trace	83	0
2013	70.9	8	83.9	17	57.8	4	0.10	54	0
2012	69.5	14	83.1	24	55.9	15	0.03	73	0
2011	65.6	64	78.1	83	53.2	41	0.30	26	0
2010	65.5	67	78.4	79	52.6	47	0.13	49	0
2009	70.2	12	83.1	24	57.2	7	trace	83	0
2008							0.32	25	11
2007							0.00	99	8
2006							0.00	99	9
2005							0.40	20	8
2004	70.8	9	85.1	10	56.3	12	0.00	99	3
2003	67.1	42	80.7	56	54.5	24	0.16	43	3
2002							0.00	99	5
2001	71.6	4	85.9	4	57.3	5	trace	83	2
2000	71.3	5	85.4	7	57.3	5	0.00	99	0
1999	66.4	50	79.2	74	53.7	34	trace	83	2
1998	63.4	90	74.3	116	52.4	49	1.53	3	2
1997	74.5	1	89.1	2	59.9	1	trace	83	1
1996	70.5	11	84.7	12	56.2	13	0.00	99	3
1995	64.1	82	74.8	113	53.5	38	0.30	26	1
1994	65	73	76.7	100	53.1	43	0.41	19	3
1993	70.8	9	84.9	11	56.7	11	trace	83	3
1992	71	7	82.9	30	59.2	2	0.04	68	1
1991	65.6	64	79.8	65	51.5	62	0.16	43	1
1990	67.7	27	81	48	54.5	24	0.39	21	0
1989	68.5	21	82.4	35	54.6	23	0.04	68	1
1988	69.2	16	84.6	13	53.8	32	trace	83	1
1987	70.1	13	83.5	18	56.8	10	0.07	62	2
1986	67.8	26	84.3	14	51.2	63	0.00	99	0
1985	66.1	54	81.4	42	50.8	70	trace	83	0
1984	72.3	2	90.8	1	53.9	30	0.02	77	1
1983	68.1	22	83	27	53.4	40	0.17	41	1
1982					54.2	28	0.34	23	6
1981	68.6	19	81.5	41	55.6	16	0.02	77	0
1980	63.6	88	76	103	51.1	65	0.00	99	0
1979	67.6	33	81.6	40	53.7	34	0.11	52	0
1978	69.2	16	85.4	7	53	44	0.00	99	0
1977	62.1	110	74.1	119	50.1	80	1.63	2	1
1976	68.6	19	83.4	20	53.7	34	0.00	99	0
1975	65.7	62	81	48	50.5	77	0.04	68	0
1974	66.5	49	79.1	77	53.9	30	0.00	99	0
1973	67.2	40	82.3	38	52.2	55	trace	83	0
1972	67.5	34	82.6	32	52.4	49	0.06	64	0
1971	62.9	103	75.6	106	50.1	80	0.27	30	1
1970	67.4	39	83	27	51.9	59	0.00	99	2
1969	67.5	34	80.5	58	54.5	24	0.60	10	0
1968	66.8	48	80.9	52	52.7	45	0.00	99	0
1967	66	56	80.9	52	51.2	63	0.03	73	0
1966	66.4	50	79.7	67	53.2	41	0.14	48	2
1965	64.6	76	78.3	81	51	67	trace	83	1
1964	63.1	97	78.4	79	47.9	106	0.05	66	1
1963	64.2	80	76.8	99	51.6	61	0.00	99	1
1962	63.4	90	77.4	92	49.5	91	0.44	17	0
1961	63.2	94	77	95	49.5	91	0.02	77	0
1960	67.7	27	83.2	23	52.1	57	0.08	57	1
1959	63.9	85	77	95	50.7	72	0.01	81	0
1958	67.5	34	82.4	35	52.7	45	0.24	33	1
1957	63.1	97	75.4	110	50.8	70	1.06	6	0
1956	66	56	79.7	67	52.4	49	0.22	34	0
1955	63.8	86	78.1	83	49.6	90	1.11	5	2
1954	66	56	79.9	64	52.4	49	0.00	99	1
1953	58.9	120	74.6	114	43.2	121	0.06	64	0
1952	66.3	52	82.5	34	49.9	85	0.01	81	1
1951	63.4	90	79.4	71	47.4	110	0.29	29	0
1950	60.3	115	75.7	105	45	117	0.08	57	0
1949	63.8	86	78.2	82	49.4	95	0.57	12	0
1948			79.5	70			0.17	41	4
1947			81.2	44			0.05	66	4
1946	63.2	94	76.5	102	49.9	85	0.04	68	0
1945	62.8	104	78	87	47.6	108	trace	83	0
1944	64.4	79	78.5	78	50.3	79	0.00	99	0
1943	65.9	60	82.4	35	49.5	91	0.00	99	0
1942	64.5	77	80.9	52	48.1	103	0.00	99	0
1941	67.5	34	82.6	32	52.4	49	0.94	7	0
1940	69.1	18	86	3	52.2	55	0.00	99	0
1939	65.5	67	81.1	46	49.9	85	trace	83	0
1938	64.1	82	79.4	71	48.8	98	0.21	35	0
1937	66.1	54	80.5	58	51.7	60	0.26	31	0
1936	66.9	46	83	27	50.7	72	0.15	46	0
1935	61.3	113	74.6	114	48	105	0.18	38	0
1934	67.7	27	85.4	7	50.1	80	0.00	99	0
1933	59.3	119	74.2	118	44.5	120	0.34	23	0
1932	64.5	77	79.2	74	49.7	88	0.10	54	0
1931	67.7	27	81.1	46	54.3	27	0.53	13	0
1930	60.1	116	75.5	108	44.7	118	3.13	1	0
1929	65.3	69	81	48	49.5	91	trace	83	0
1928	66.9	46	80.1	62	53.6	37	0.94	7	0
1927	66	56	83.4	20	48.5	100	0.08	57	0
1926	67.2	40	83.4	20	50.9	68	0.08	57	0
1925	65.3	69	79.4	71	51.1	65			0
1924	67.7	27	83.5	18	52	58			0
1923	67.1	42	84.2	15	50	83	0.00	99	0
1922	65.8	61	82.8	31	48.9	97			0
1921	61.5	112	72.5	121	50.6	74			0
1920	65	73	80.2	61	49.7	88			0
1919	65.7	62	78.1	83	53.5	38			3
1918	62.8	104	77.3	93	48.2	101	0.19	37	1
1917	62.5	108	77.2	94	47.9	106	0.18	38	0
1916	63	101	81.2	44	44.7	118	0.12	50	0
1915	62.3	109	77	95	47.6	108	1.32	4	0
1914	63.1	97	75.3	111	50.9	68	0.04	68	0
1913	63.3	93	79.7	67	47	111	0.30	26	0
1912	64.1	82	80	63	48.1	103	0.38	22	0
1911	63.1	97	80.3	60	45.9	113	0.03	73	0
1910	67	45	84	16	50	83	0.00	99	0
1909	63	101	75.5	108	50.5	77	0.09	56	0
1908	61.2	114	76.9	98	45.5	116	0.21	35	0
1907	63.5	89	77.9	89	49.2	96	0.07	62	0
1906	59.9	118	71.5	122	48.2	101	0.52	14	0
1905	60.1	116	74.3	116	45.8	114	0.88	9	0
1904	64.2	80	77.8	90	50.6	74	0.08	57	0
1903	62.8	104	75	112	50.6	74	0.03	73	0
1902	61.9	111	78	87	45.7	115	0.16	43	1
1895	67.7	27	83.1	24	52.4	49	0.26	31	0
1894	62.7	107	79.2	74	46.2	112			1
1893	65.1	72	81.4	42	48.7	99	0.00	99	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1997	74.5
1984	72.3
2014	71.8
2001	71.6
2020	71.3
2000	71.3
1992	71
2013	70.9
2004	70.8
1993	70.8

Coldest
Year	Mean, °F
1953	58.9
1933	59.3
1906	59.9
1930	60.1
1905	60.1
1950	60.3
1908	61.2
1935	61.3
1921	61.5
1902	61.9

Wettest
Year	Precipitation, in
1930	3.13
1977	1.63
1998	1.53
1915	1.32
1955	1.11
1957	1.06
1941	0.94
1928	0.94
1905	0.88
2015	0.60
More years share the last value

Driest
Year	Precipitation, in
2007	0.00
2006	0.00
2004	0.00
2002	0.00
2000	0.00
1996	0.00
1986	0.00
1980	0.00
1978	0.00
1976	0.00
More years share the last value

The hottest, coldest and wettest days

Hottest day: 97°F; 11 May 2026
Coldest night: 49°F; 28 May 2026, 6 May 2026
Wettest day: 0.10 in; 5 May 2026

Every month, season and year

Months

Seasons

Years

Riverside, CA the day's answers

All-time records

Every answer in words

May 2026 brought 0.11 in of precipitation in Riverside, CA, the wettest May since 2025, tied 52nd wettest of 121 (with 1979).
The hottest day of May 2026 in Riverside, CA: 97°F on Monday 11 May 2026.
The coldest night of May 2026 in Riverside, CA: a low of 49°F on Thursday 28 May 2026 and Wednesday 6 May 2026.
The wettest day of May 2026 in Riverside, CA: 0.10 in on Tuesday 5 May 2026.