Napa September 17 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of September 17.
September 17 All-Time Records
1901–2024
Highest temperature 102 °F 1913
Lowest temperature 42 °F 2006
Lowest daily high 65 °F 1989
Highest daily low 72 °F 1923
Most precipitation 0.84 inches 1989
September 17 Average Weather
1991–2020 1
Average high 80.7 °F
Average low 50.6 °F
Chance precipitation 3.0%
Napa September 17 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 78 61 0.00 n/a
2022 78 52 0.00 n/a
2021 69 56 0.00 n/a
2020 83 63 0.00 n/a
2019 78 46 0.00 n/a
2018 75 52 0.00 n/a
2017 75 48 0.00 0.0
2016 85 46 0.00 n/a
2015 75 52 0.00 n/a
2014 82 56 0.00 n/a
2013 80 54 0.00 n/a
2012 72 47 0.00 n/a
2011 81 52 0.00 n/a
2010 79 58 0.00 n/a
2009 86 57 0.00 n/a
2008 68 47 0.00 n/a
2007 81 47 0.00 n/a
2006 86 42 0.00 n/a
2005 73 42 0.00 n/a
2004 83 50 0.00 n/a
2003 83 43 0.00 n/a
2002 85 47 0.00 n/a
2001 71 51 0.00 n/a
2000 94 50 0.00 n/a
1999 70 49 0.00 n/a
1998 81 51 0.00 0.0
1997 82 52 0.00 0.0
1996 83 48 0.00 0.0
1995 84 51 0.00 0.0
1994 93 54 0.00 0.0
1993 72 52 0.00 0.0
1992 76 51 0.00 0.0
1991 89 50 0.00 0.0
1990 81 55 0.00 0.0
1989 65 55 0.84 0.0
1988 86 48 0.00 0.0
1987 83 51 0.00 0.0
1986 74 59 0.18 0.0
1985 71 51 0.00 0.0
1984 101 59 0.00 0.0
1983 80 54 0.00 0.0
1982 72 57 0.03 0.0
1981 82 52 0.00 0.0
1980 82 55 0.00 0.0
1979 87 55 0.00 0.0
1978 83 51 0.00 0.0
1977 71 56 0.11 0.0
1976 79 52 0.00 0.0
1975 77 50 0.00 0.0
1974 87 50 0.00 0.0
1973 74 48 0.00 0.0
1972 76 48 0.00 0.0
1971 81 56 0.00 0.0
1970 93 49 0.00 0.0
1969 77 47 0.00 0.0
1968 96 70 0.00 0.0
1967 81 57 0.00 0.0
1966 88 53 0.00 0.0
1965 79 59 0.00 0.0
1964 84 51 0.00 0.0
1963 76 56 0.00 0.0
1962 90 54 0.00 0.0
1961 72 47 0.00 0.0
1960 80 49 0.00 0.0
1959 71 46 0.00 0.0
1958 85 55 0.00 0.0
1957 n/a 55 0.00 0.0
1956 89 50 0.00 0.0
1955 72 46 0.02 0.0
1954 80 44 0.00 0.0
1953 79 59 0.00 0.0
1952 84 42 0.00 0.0
1951 80 51 0.00 0.0
1950 76 50 0.00 0.0
1949 92 49 0.00 0.0
1948 78 48 0.16 0.0
1947 83 52 0.00 n/a
1946 83 52 0.00 n/a
1945 82 50 0.00 n/a
1944 80 44 0.00 n/a
1943 83 45 0.00 n/a
1942 75 51 0.00 n/a
1941 84 50 0.00 n/a
1940 78 62 0.00 n/a
1939 99 50 0.00 n/a
1938 80 53 0.00 n/a
1937 82 48 0.00 n/a
1936 92 45 0.00 n/a
1935 97 54 0.00 n/a
1934 96 52 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 80 52 0.00 n/a
1931 73 52 0.00 n/a
1930 74 59 0.00 n/a
1929 89 53 0.00 n/a
1928 78 50 0.00 n/a
1927 75 48 0.00 n/a
1926 74 44 0.00 n/a
1925 66 58 0.14 n/a
1924 69 50 0.00 n/a
1923 84 72 0.00 n/a
1922 89 44 0.00 n/a
1921 70 45 0.00 n/a
1920 78 50 0.00 n/a
1919 85 47 0.00 n/a
1918 84 55 0.00 n/a
1917 98 49 0.00 n/a
1916 n/a n/a n/a n/a
1915 n/a n/a n/a n/a
1914 74 51 0.00 n/a
1913 102 64 0.00 n/a
1912 88 56 0.00 n/a
1911 86 54 0.00 n/a
1910 82 45 0.00 n/a
1909 79 51 n/a n/a
1908 80 51 0.00 n/a
1907 77 54 0.00 n/a
1906 94 52 0.00 n/a
1905 75 52 0.00 n/a
1904 77 57 0.00 n/a
1903 97 49 0.00 n/a
1902 69 51 0.00 n/a
1901 80 46 0.00 n/a
What's the all-time high for Napa on 9/17?
For the date of Sep 17, the highest temperature ever reached in Napa history is 102 °F which happened in 1913.
Highest Temperatures in Napa on September 17
Rank Temperature Year
1 102 °F 1913
2 101 °F 1984
3 99 °F 1939
4 98 °F 1917
5 97 °F 1935
5 97 °F 1903
7 96 °F 1968
7 96 °F 1934
9 94 °F 2000
9 94 °F 1906
What's the all-time low for Napa on 9/17?
For the date of Sep 17, the lowest temperature ever reached in Napa history is 42 °F which has happened 3 times, most recently in 2006.
Lowest Temperatures in Napa on September 17
Rank Temperature Year
1 42 °F 1952
1 42 °F 2006
1 42 °F 2005
4 43 °F 2003
5 44 °F 1926
5 44 °F 1944
5 44 °F 1954
5 44 °F 1922
9 45 °F 1910
9 45 °F 1921
9 45 °F 1936
9 45 °F 1943
Lowest High Temperatures in Napa on September 17
Rank Temperature Year
1 65 °F 1989
2 66 °F 1925
3 68 °F 2008
4 69 °F 2021
4 69 °F 1924
4 69 °F 1902
7 70 °F 1999
7 70 °F 1921
9 71 °F 1977
9 71 °F 2001
9 71 °F 1985
9 71 °F 1959
What's the most it has ever rained in Napa on 9/17?
For the date of Sep 17, the most precipitation ever recorded in Napa history is 0.84 inches which happened in 1989.
All-Time Most Precipitation in Napa on September 17
Rank Precipitation Year
1 0.84 inches 1989
2 0.18 inches 1986
3 0.16 inches 1948
4 0.14 inches 1925
5 0.11 inches 1977
6 0.03 inches 1982
7 0.02 inches 1955
Weather Station Details
Years Station Coordinates
1999–2024 Napa County Airport location
1901–1998 Napa State Hospital location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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