Napa September 21 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of September 21.
September 21 All-Time Records
1901–2024
Highest temperature 105 °F 1939
Lowest temperature 41 °F 2017
Lowest daily high 60 °F 1917
Highest daily low 68 °F 1983
Most precipitation 0.82 inches 2013
September 21 Average Weather
1991–2020 1
Average high 79.9 °F
Average low 50.1 °F
Chance precipitation 4.5%
Napa September 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 74 50 0.00 n/a
2022 78 57 0.02 n/a
2021 96 51 0.00 n/a
2020 79 55 0.00 n/a
2019 88 48 0.00 n/a
2018 76 47 0.00 n/a
2017 74 41 0.00 0.0
2016 79 54 0.00 n/a
2015 96 52 0.00 n/a
2014 80 61 0.00 n/a
2013 71 53 0.82 n/a
2012 78 41 0.00 n/a
2011 91 49 0.00 n/a
2010 73 47 0.00 n/a
2009 87 54 0.00 n/a
2008 74 44 0.00 n/a
2007 78 51 0.00 n/a
2006 86 48 0.00 n/a
2005 79 44 0.00 n/a
2004 83 44 0.00 n/a
2003 102 50 0.00 n/a
2002 85 48 0.00 n/a
2001 71 49 0.00 n/a
2000 71 61 0.00 n/a
1999 83 48 0.00 n/a
1998 75 57 0.00 0.0
1997 91 57 0.00 0.0
1996 87 54 0.00 0.0
1995 79 57 0.00 0.0
1994 77 55 0.00 0.0
1993 72 49 0.00 0.0
1992 80 52 0.00 0.0
1991 79 54 0.00 0.0
1990 98 57 0.00 0.0
1989 87 52 0.00 0.0
1988 76 47 0.00 0.0
1987 90 50 0.00 0.0
1986 74 48 0.00 0.0
1985 83 50 0.00 0.0
1984 86 57 0.00 0.0
1983 81 68 0.00 0.0
1982 90 51 0.00 0.0
1981 89 50 0.00 0.0
1980 82 48 0.00 0.0
1979 81 58 0.00 0.0
1978 84 48 0.00 0.0
1977 83 51 0.00 0.0
1976 78 52 0.00 0.0
1975 75 54 0.00 0.0
1974 77 52 0.00 0.0
1973 79 49 0.00 0.0
1972 88 48 0.00 0.0
1971 75 50 0.00 0.0
1970 87 45 0.00 0.0
1969 80 49 0.00 0.0
1968 81 52 0.00 0.0
1967 96 59 0.00 0.0
1966 76 52 0.00 0.0
1965 86 43 0.00 0.0
1964 92 54 0.00 0.0
1963 80 50 0.00 0.0
1962 87 50 0.00 0.0
1961 70 51 0.00 0.0
1960 72 48 0.00 0.0
1959 77 50 0.00 0.0
1958 94 52 0.00 0.0
1957 n/a 47 0.00 0.0
1956 89 49 0.00 0.0
1955 83 48 0.00 0.0
1954 84 50 0.00 0.0
1953 72 58 0.00 0.0
1952 82 50 0.00 0.0
1951 79 52 0.00 0.0
1950 95 52 0.00 0.0
1949 104 55 0.00 0.0
1948 76 50 0.00 0.0
1947 102 54 0.00 n/a
1946 95 51 0.00 n/a
1945 71 50 0.00 n/a
1944 80 45 0.00 n/a
1943 103 58 0.00 n/a
1942 83 47 0.00 n/a
1941 81 51 0.00 n/a
1940 88 48 0.00 n/a
1939 105 68 0.00 n/a
1938 85 45 0.00 n/a
1937 76 50 0.00 n/a
1936 79 49 0.00 n/a
1935 73 51 0.00 n/a
1934 74 51 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 81 47 0.00 n/a
1931 92 50 0.00 n/a
1930 74 58 0.00 n/a
1929 76 45 0.00 n/a
1928 102 51 0.00 n/a
1927 77 42 0.00 n/a
1926 77 43 0.00 n/a
1925 80 43 0.00 n/a
1924 84 42 0.00 n/a
1923 64 56 0.00 n/a
1922 80 45 0.00 n/a
1921 89 47 0.00 n/a
1920 79 47 0.00 n/a
1919 91 50 0.00 n/a
1918 70 48 0.00 n/a
1917 60 44 0.00 n/a
1916 n/a n/a n/a n/a
1915 n/a n/a n/a n/a
1914 90 50 0.00 n/a
1913 83 61 0.00 n/a
1912 80 54 0.00 n/a
1911 66 54 0.00 n/a
1910 84 47 0.00 n/a
1909 95 49 n/a n/a
1908 87 56 0.00 n/a
1907 75 49 0.00 n/a
1906 74 55 0.00 n/a
1905 100 54 0.00 n/a
1904 76 54 0.00 n/a
1903 73 48 0.00 n/a
1902 95 n/a 0.00 n/a
1901 74 56 0.07 n/a
What's the all-time high for Napa on 9/21?
For the date of Sep 21, the highest temperature ever reached in Napa history is 105 °F which happened in 1939.
Highest Temperatures in Napa on September 21
Rank Temperature Year
1 105 °F 1939
2 104 °F 1949
3 103 °F 1943
4 102 °F 1947
4 102 °F 1928
4 102 °F 2003
7 100 °F 1905
8 98 °F 1990
9 96 °F 1967
9 96 °F 2015
9 96 °F 2021
What's the all-time low for Napa on 9/21?
For the date of Sep 21, the lowest temperature ever reached in Napa history is 41 °F which has happened 2 times, most recently in 2017.
Lowest Temperatures in Napa on September 21
Rank Temperature Year
1 41 °F 2017
1 41 °F 2012
3 42 °F 1924
3 42 °F 1927
5 43 °F 1965
5 43 °F 1926
5 43 °F 1925
8 44 °F 2004
8 44 °F 2005
8 44 °F 2008
8 44 °F 1917
Lowest High Temperatures in Napa on September 21
Rank Temperature Year
1 60 °F 1917
2 64 °F 1923
3 66 °F 1911
4 70 °F 1961
4 70 °F 1918
6 71 °F 2001
6 71 °F 2013
6 71 °F 1945
6 71 °F 2000
10 72 °F 1953
10 72 °F 1993
10 72 °F 1960
What's the most it has ever rained in Napa on 9/21?
For the date of Sep 21, the most precipitation ever recorded in Napa history is 0.82 inches which happened in 2013.
All-Time Most Precipitation in Napa on September 21
Rank Precipitation Year
1 0.82 inches 2013
2 0.07 inches 1901
3 0.02 inches 2022
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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