Average May Temperature in Half Moon Bay by Year

This page contains a list of the average monthly high and low temperatures in Half Moon Bay, California for the month of May each year between 1940 and 2023. It is based on NOAA data.

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What Was the Hottest May Ever in Half Moon Bay?

1941 was the warmest May in the history of Half Moon Bay, California. The average daily high temperature was 65.7 °F, and the average low was 52.3 °F.

What Was the Coldest May Ever in Half Moon Bay?

1991 was the coolest May in the history of Half Moon Bay, California. The average daily high temperature was 56.9 °F, and the average low was 42.5 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	37	59.2	50.2
2022	70	59.6	46.0
2021	71	59.2	46.1
2020	11	64.1	48.7
2019	16	61.0	50.6
2018	17	61.3	49.9
2017	35	61.4	48.0
2016	6	63.5	51.0
2015	8	62.5	50.8
2014	7	65.7	48.5
2013	15	63.2	48.4
2012	57	61.6	46.0
2011	33	62.7	46.9
2010	64	61.4	45.0
2009	54	60.7	47.3
2008	63	62.0	44.6
2007	41	62.3	46.7
2006	20	62.9	48.0
2005	5	64.6	50.6
2004	10	64.5	48.4
2000	26	61.2	49.3
1999	78	56.9	45.1
1998	18	61.3	49.9
1997	3	64.6	51.1
1996	32	61.7	47.9
1995	31	59.5	50.2
1993	27	64.4	45.8
1992	2	65.7	50.1
1991	79	56.9	42.5
1990	52	60.1	48.2
1989	34	61.5	47.8
1987	12	61.2	50.9
1986	68	60.3	46.0
1985	29	61.6	48.5
1984	47	62.2	46.6
1983	23	61.8	48.9
1982	45	60.7	48.1
1981	48	60.8	47.9
1980	49	60.4	48.2
1979	40	62.2	47.0
1978	22	64.8	46.1
1977	59	60.3	47.0
1976	46	61.8	47.0
1975	67	59.9	46.3
1974	69	59.0	46.7
1973	50	60.6	48.0
1972	73	60.8	44.2
1971	76	58.7	44.6
1970	36	63.9	45.4
1969	62	58.4	48.4
1968	44	60.6	48.3
1967	65	62.4	44.0
1966	77	61.6	41.5
1965	58	61.1	46.3
1964	75	57.9	45.7
1963	42	59.7	49.3
1962	60	60.2	47.0
1961	19	61.6	49.5
1960	24	62.6	48.1
1959	13	63.5	48.5
1958	4	64.6	51.0
1957	9	62.9	50.4
1956	25	62.2	48.3
1955	72	60.5	44.7
1954	55	61.7	46.2
1953	38	62.8	46.4
1952	66	59.4	46.9
1951	51	61.1	47.5
1950	74	59.3	45.0
1949	30	61.4	48.6
1948	53	61.4	46.8
1947	21	62.5	48.4
1946	61	59.8	47.4
1945	39	60.6	48.6
1944	56	61.2	46.5
1943	43	64.0	45.0
1942	28	62.8	47.4
1941	1	65.7	52.3
1940	14	62.8	48.8

Weather Station Details

Years	Station	Coordinates
1939–2024	Half Moon Bay	location