Napa September 20 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of September 20.
September 20 All-Time Records
1901–2024
Highest temperature 105 °F 1939
Lowest temperature 38 °F 2004
Lowest daily high 62 °F 1911
Highest daily low 65 °F 1939
Most precipitation 0.14 inches 1973
September 20 Average Weather
1991–2020 1
Average high 80.1 °F
Average low 50.2 °F
Chance precipitation 3.9%
Napa September 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 73 59 0.00 n/a
2022 77 53 0.00 n/a
2021 89 45 0.00 n/a
2020 86 54 0.00 n/a
2019 84 46 0.00 n/a
2018 87 44 0.00 n/a
2017 78 51 0.00 0.0
2016 78 51 0.00 n/a
2015 95 50 0.00 n/a
2014 77 58 0.00 n/a
2013 80 42 0.00 n/a
2012 74 43 0.00 n/a
2011 97 52 0.00 n/a
2010 79 50 0.00 n/a
2009 84 58 0.00 n/a
2008 74 52 0.00 n/a
2007 72 45 0.02 n/a
2006 89 44 0.00 n/a
2005 71 47 0.00 n/a
2004 77 38 0.00 n/a
2003 93 47 0.00 n/a
2002 93 50 0.00 n/a
2001 71 49 0.00 n/a
2000 81 56 0.00 n/a
1999 74 51 0.00 n/a
1998 82 53 0.00 0.0
1997 92 53 0.00 0.0
1996 88 52 0.00 0.0
1995 80 57 0.00 0.0
1994 78 54 0.00 0.0
1993 83 53 0.00 0.0
1992 80 51 0.00 0.0
1991 73 54 0.00 0.0
1990 82 53 0.00 0.0
1989 78 53 0.00 0.0
1988 76 47 0.00 0.0
1987 90 47 0.00 0.0
1986 76 47 0.00 0.0
1985 82 52 0.00 0.0
1984 85 59 0.00 0.0
1983 100 61 0.00 0.0
1982 84 49 0.00 0.0
1981 85 49 0.00 0.0
1980 77 46 0.00 0.0
1979 83 51 0.00 0.0
1978 85 47 0.00 0.0
1977 78 54 0.00 0.0
1976 78 54 0.00 0.0
1975 78 49 0.00 0.0
1974 78 50 0.00 0.0
1973 78 61 0.14 0.0
1972 86 48 0.00 0.0
1971 86 48 0.00 0.0
1970 78 46 0.00 0.0
1969 71 52 0.00 0.0
1968 76 44 0.00 0.0
1967 102 57 0.00 0.0
1966 78 53 0.00 0.0
1965 82 42 0.00 0.0
1964 99 52 0.00 0.0
1963 78 53 0.00 0.0
1962 77 47 0.00 0.0
1961 78 45 0.00 0.0
1960 74 48 0.00 0.0
1959 76 54 0.00 0.0
1958 94 52 0.00 0.0
1957 n/a 46 0.00 0.0
1956 77 50 0.00 0.0
1955 81 44 0.00 0.0
1954 92 47 0.00 0.0
1953 75 58 0.00 0.0
1952 83 51 0.00 0.0
1951 82 52 0.00 0.0
1950 90 50 0.00 0.0
1949 99 51 0.00 0.0
1948 78 48 0.00 0.0
1947 98 53 0.00 n/a
1946 94 57 0.00 n/a
1945 72 55 0.00 n/a
1944 76 40 0.00 n/a
1943 104 53 0.00 n/a
1942 80 44 0.00 n/a
1941 77 43 0.00 n/a
1940 88 48 0.00 n/a
1939 105 65 0.00 n/a
1938 84 44 0.00 n/a
1937 84 46 0.00 n/a
1936 94 48 0.00 n/a
1935 72 53 0.00 n/a
1934 80 49 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 80 44 0.00 n/a
1931 92 57 0.00 n/a
1930 72 49 0.00 n/a
1929 72 52 0.00 n/a
1928 98 49 0.00 n/a
1927 74 45 0.00 n/a
1926 69 43 0.00 n/a
1925 80 43 0.00 n/a
1924 83 54 0.00 n/a
1923 72 54 0.00 n/a
1922 80 49 0.00 n/a
1921 88 47 0.00 n/a
1920 77 56 0.00 n/a
1919 97 53 0.00 n/a
1918 74 54 0.00 n/a
1917 75 40 0.00 n/a
1916 n/a n/a n/a n/a
1915 n/a n/a n/a n/a
1914 81 50 0.00 n/a
1913 81 57 0.00 n/a
1912 87 57 0.00 n/a
1911 62 44 0.00 n/a
1910 80 45 0.00 n/a
1909 84 48 n/a n/a
1908 78 58 0.00 n/a
1907 88 50 0.00 n/a
1906 78 51 0.00 n/a
1905 93 52 0.00 n/a
1904 81 48 0.00 n/a
1903 75 47 0.00 n/a
1902 88 55 0.00 n/a
1901 75 55 0.00 n/a
What's the all-time high for Napa on 9/20?
For the date of Sep 20, the highest temperature ever reached in Napa history is 105 °F which happened in 1939.
Highest Temperatures in Napa on September 20
Rank Temperature Year
1 105 °F 1939
2 104 °F 1943
3 102 °F 1967
4 100 °F 1983
5 99 °F 1964
5 99 °F 1949
7 98 °F 1947
7 98 °F 1928
9 97 °F 2011
9 97 °F 1919
What's the all-time low for Napa on 9/20?
For the date of Sep 20, the lowest temperature ever reached in Napa history is 38 °F which happened in 2004.
Lowest Temperatures in Napa on September 20
Rank Temperature Year
1 38 °F 2004
2 40 °F 1944
2 40 °F 1917
4 42 °F 1965
4 42 °F 2013
6 43 °F 2012
6 43 °F 1926
6 43 °F 1941
6 43 °F 1925
10 44 °F 1932
10 44 °F 1911
10 44 °F 1968
10 44 °F 1955
10 44 °F 2018
10 44 °F 1938
10 44 °F 2006
10 44 °F 1942
Lowest High Temperatures in Napa on September 20
Rank Temperature Year
1 62 °F 1911
2 69 °F 1926
3 71 °F 1969
3 71 °F 2005
3 71 °F 2001
6 72 °F 1929
6 72 °F 1923
6 72 °F 1945
6 72 °F 1935
6 72 °F 2007
6 72 °F 1930
What's the most it has ever rained in Napa on 9/20?
For the date of Sep 20, the most precipitation ever recorded in Napa history is 0.14 inches which happened in 1973.
All-Time Most Precipitation in Napa on September 20
Rank Precipitation Year
1 0.14 inches 1973
2 0.02 inches 2007
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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