Napa September 15 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of September 15.
September 15 All-Time Records
1901–2024
Highest temperature 106 °F 1971
Lowest temperature 39 °F 2006
Lowest daily high 68 °F 1926
Highest daily low 62 °F 1982
Most precipitation 0.42 inches 1955
September 15 Average Weather
1991–2020 1
Average high 81.0 °F
Average low 50.9 °F
Chance precipitation 2.9%
Napa September 15 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 75 61 0.00 n/a
2022 76 50 0.00 n/a
2021 72 54 0.00 n/a
2020 81 48 0.00 n/a
2019 81 52 0.00 n/a
2018 77 50 0.00 n/a
2017 78 46 0.00 0.0
2016 77 44 0.00 n/a
2015 71 53 0.00 n/a
2014 83 52 0.00 n/a
2013 83 49 0.00 n/a
2012 76 49 0.00 n/a
2011 70 56 0.00 n/a
2010 74 51 0.00 n/a
2009 82 48 0.00 n/a
2008 77 47 0.00 n/a
2007 78 47 0.00 n/a
2006 73 39 0.00 n/a
2005 69 48 0.00 n/a
2004 91 50 0.00 n/a
2003 74 49 0.00 n/a
2002 76 51 0.00 n/a
2001 71 52 0.00 n/a
2000 78 53 0.00 n/a
1999 71 49 0.00 n/a
1998 89 56 0.00 0.0
1997 78 50 0.03 0.0
1996 76 59 0.02 0.0
1995 76 53 0.00 0.0
1994 92 52 0.00 0.0
1993 71 53 0.00 0.0
1992 79 45 0.00 0.0
1991 76 51 0.00 0.0
1990 79 50 0.00 0.0
1989 82 53 0.00 0.0
1988 77 50 0.00 0.0
1987 83 52 0.00 0.0
1986 74 53 0.05 0.0
1985 80 50 0.00 0.0
1984 82 54 0.00 0.0
1983 97 58 0.00 0.0
1982 75 62 0.00 0.0
1981 79 53 0.00 0.0
1980 83 51 0.00 0.0
1979 91 55 0.00 0.0
1978 86 51 0.00 0.0
1977 69 51 0.00 0.0
1976 80 52 0.00 0.0
1975 78 49 0.00 0.0
1974 77 50 0.00 0.0
1973 73 53 0.00 0.0
1972 75 50 0.00 0.0
1971 106 62 0.00 0.0
1970 84 41 0.00 0.0
1969 70 47 0.00 0.0
1968 88 51 0.00 0.0
1967 81 50 0.00 0.0
1966 86 48 0.00 0.0
1965 88 50 0.00 0.0
1964 85 48 0.00 0.0
1963 88 51 0.00 0.0
1962 90 53 0.00 0.0
1961 79 55 0.00 0.0
1960 70 52 0.00 0.0
1959 70 49 0.00 0.0
1958 96 56 0.00 0.0
1957 n/a 54 0.00 0.0
1956 84 45 0.00 0.0
1955 76 44 0.42 0.0
1954 76 42 0.00 0.0
1953 79 59 0.00 0.0
1952 85 52 0.00 0.0
1951 97 52 0.00 0.0
1950 80 49 0.00 0.0
1949 82 54 0.00 0.0
1948 83 43 0.00 0.0
1947 89 53 0.00 n/a
1946 77 50 0.00 n/a
1945 79 51 0.00 n/a
1944 90 54 0.00 n/a
1943 79 54 0.00 n/a
1942 100 56 0.00 n/a
1941 81 52 0.00 n/a
1940 80 54 0.00 n/a
1939 89 43 0.00 n/a
1938 90 51 0.00 n/a
1937 87 55 0.00 n/a
1936 84 41 0.00 n/a
1935 83 54 0.02 n/a
1934 91 55 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 89 43 0.00 n/a
1931 77 57 0.00 n/a
1930 78 51 0.00 n/a
1929 98 48 0.00 n/a
1928 88 61 0.00 n/a
1927 84 42 0.00 n/a
1926 68 49 0.00 n/a
1925 74 60 0.00 n/a
1924 70 47 0.00 n/a
1923 82 50 0.00 n/a
1922 96 55 0.00 n/a
1921 78 45 0.00 n/a
1920 95 50 0.00 n/a
1919 78 47 0.00 n/a
1918 80 52 0.00 n/a
1917 102 51 0.00 n/a
1916 n/a n/a n/a n/a
1915 n/a n/a n/a n/a
1914 83 46 0.00 n/a
1913 99 55 0.00 n/a
1912 74 59 0.00 n/a
1911 81 45 0.00 n/a
1910 73 51 0.13 n/a
1909 102 54 n/a n/a
1908 76 57 0.00 n/a
1907 73 50 0.00 n/a
1906 85 55 0.00 n/a
1905 76 58 0.00 n/a
1904 80 56 0.00 n/a
1903 92 45 0.00 n/a
1902 94 55 0.00 n/a
1901 80 53 0.00 n/a
What's the all-time high for Napa on 9/15?
For the date of Sep 15, the highest temperature ever reached in Napa history is 106 °F which happened in 1971.
Highest Temperatures in Napa on September 15
Rank Temperature Year
1 106 °F 1971
2 102 °F 1909
2 102 °F 1917
4 100 °F 1942
5 99 °F 1913
6 98 °F 1929
7 97 °F 1951
7 97 °F 1983
9 96 °F 1922
9 96 °F 1958
What's the all-time low for Napa on 9/15?
For the date of Sep 15, the lowest temperature ever reached in Napa history is 39 °F which happened in 2006.
Lowest Temperatures in Napa on September 15
Rank Temperature Year
1 39 °F 2006
2 41 °F 1970
2 41 °F 1936
4 42 °F 1927
4 42 °F 1954
6 43 °F 1948
6 43 °F 1939
6 43 °F 1932
9 44 °F 1955
9 44 °F 2016
Lowest High Temperatures in Napa on September 15
Rank Temperature Year
1 68 °F 1926
2 69 °F 2005
2 69 °F 1977
4 70 °F 1959
4 70 °F 1969
4 70 °F 1960
4 70 °F 1924
4 70 °F 2011
9 71 °F 2015
9 71 °F 1999
9 71 °F 1993
9 71 °F 2001
What's the most it has ever rained in Napa on 9/15?
For the date of Sep 15, the most precipitation ever recorded in Napa history is 0.42 inches which happened in 1955.
All-Time Most Precipitation in Napa on September 15
Rank Precipitation Year
1 0.42 inches 1955
2 0.13 inches 1910
3 0.05 inches 1986
4 0.03 inches 1997
5 0.02 inches 1935
5 0.02 inches 1996
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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