Average July Temperature in Napa by Year

This page contains a list of the average monthly high and low temperatures in Napa, California for the month of July each year between 1901 and 2023. It is based on NOAA data.

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What Was the Hottest July Ever in Napa?

1906 was the warmest July in the history of Napa, California. The average daily high temperature was 85.8 °F, and the average low was 57.3 °F.

What Was the Coldest July Ever in Napa?

1923 was the coolest July in the history of Napa, California. The average daily high temperature was 75.1 °F, and the average low was 50.8 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	49	79.9	54.9
2022	88	77.0	54.7
2021	97	76.4	54.1
2020	75	78.2	54.7
2019	76	78.6	54.3
2018	70	79.2	53.8
2017	33	82.0	54.4
2016	104	78.2	51.2
2015	41	79.6	55.9
2014	66	78.5	55.2
2013	91	77.2	54.2
2012	96	77.3	53.4
2011	94	77.3	53.7
2010	115	75.0	51.6
2009	106	78.2	51.1
2008	80	79.3	53.3
2007	47	81.0	54.2
2006	16	83.3	55.6
2005	71	80.2	52.8
2004	82	77.3	54.6
2003	63	81.3	52.5
2002	90	78.2	53.3
2001	100	77.1	52.9
2000	112	75.8	52.2
1999	103	77.0	52.5
1998	17	83.1	55.6
1997	26	82.3	54.8
1996	10	85.7	54.7
1995	3	85.5	56.6
1994	81	78.4	53.7
1993	27	81.8	55.3
1992	14	83.3	55.8
1991	55	79.7	54.8
1990	19	82.5	55.8
1989	21	84.9	53.2
1988	2	86.6	56.2
1987	85	79.2	52.5
1986	48	81.0	54.1
1985	11	83.3	56.4
1984	7	84.8	56.2
1983	12	83.1	56.3
1982	61	79.8	54.2
1981	28	83.7	53.3
1980	35	82.9	53.3
1979	18	84.5	54.1
1978	44	83.4	52.0
1977	43	82.9	52.6
1976	37	82.7	53.1
1975	53	82.0	52.7
1974	30	82.6	54.0
1973	39	81.9	53.7
1972	8	84.3	56.3
1971	25	81.2	55.9
1970	36	82.5	53.4
1969	57	81.5	53.0
1968	45	82.2	53.0
1967	29	82.9	54.0
1966	86	80.2	51.5
1965	92	80.8	50.5
1964	31	83.6	52.9
1963	62	82.4	51.5
1962	107	78.5	50.7
1961	6	88.6	53.0
1960	34	83.4	52.8
1959	59	81.4	52.9
1958	69	79.0	54.4
1957	22	84.4	53.0
1956	77	79.1	53.7
1955	95	80.1	50.7
1954	24	85.0	52.2
1953	58	83.5	50.9
1952	42	82.1	53.5
1951	74	81.5	51.4
1950	50	82.6	52.3
1949	83	81.1	50.7
1948	73	81.3	51.7
1946	40	83.2	52.4
1945	32	84.3	52.2
1944	99	78.1	52.0
1943	60	81.2	52.9
1942	38	83.0	52.8
1941	23	82.8	54.4
1940	52	82.6	52.2
1939	56	83.5	50.9
1938	68	81.3	52.2
1937	98	78.1	52.4
1936	79	80.4	52.2
1935	109	79.2	49.9
1934	87	79.6	52.0
1932	20	87.8	50.3
1931	9	87.3	53.2
1930	108	79.5	49.7
1929	84	81.4	50.4
1928	114	75.2	51.8
1927	116	75.7	50.9
1926	101	77.9	51.7
1925	105	75.4	53.9
1923	117	75.1	50.8
1922	51	82.7	52.1
1921	65	83.8	50.0
1920	110	80.8	47.8
1919	102	78.6	50.9
1918	46	82.5	52.7
1917	15	87.9	51.1
1914	64	78.0	55.9
1913	5	83.2	58.5
1912	54	79.5	55.2
1911	111	76.6	51.6
1910	72	79.8	53.2
1909	78	80.0	52.7
1908	4	85.4	56.7
1907	67	77.8	55.8
1906	1	85.8	57.3
1905	13	82.0	57.5
1904	93	78.6	52.5
1903	89	80.1	51.4
1901	113	79.7	48.2

Weather Station Details

Years	Station	Coordinates
1999–2024	Napa County Airport	location
1901–1998	Napa State Hospital	location