Napa August 21 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of August 21.
August 21 All-Time Records
1901–2024
Highest temperature 100 °F 1969
Lowest temperature 44 °F 1935
Lowest daily high 67 °F 1924
Highest daily low 66 °F 1918
Most precipitation 0.30 inches 2003
August 21 Average Weather
1991–2020 1
Average high 80.9 °F
Average low 53.5 °F
Chance precipitation 0.7%
Napa August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 77 64 0.00 n/a
2022 77 56 0.00 n/a
2021 70 56 0.00 n/a
2020 93 59 0.00 n/a
2019 87 50 0.00 n/a
2018 71 56 0.00 n/a
2017 77 58 0.00 n/a
2016 76 56 0.00 n/a
2015 72 58 0.00 n/a
2014 81 59 0.00 n/a
2013 77 55 0.00 0.0
2012 72 51 0.00 n/a
2011 71 56 0.00 n/a
2010 71 53 0.00 n/a
2009 90 52 0.00 n/a
2008 82 61 0.00 n/a
2007 89 59 0.00 n/a
2006 72 54 0.00 n/a
2005 74 51 0.00 n/a
2004 79 53 0.00 n/a
2003 77 57 0.30 n/a
2002 76 48 0.00 n/a
2001 78 47 0.00 n/a
2000 77 52 0.00 n/a
1999 89 55 0.00 n/a
1998 84 52 0.00 0.0
1997 87 56 0.00 0.0
1996 88 52 0.00 0.0
1995 82 58 0.00 0.0
1994 81 55 0.00 0.0
1993 89 55 0.00 0.0
1992 81 52 0.00 0.0
1991 80 n/a 0.00 0.0
1990 77 59 0.00 0.0
1989 75 55 0.00 0.0
1988 76 58 0.00 0.0
1987 76 49 0.00 0.0
1986 76 55 0.00 0.0
1985 78 53 0.00 0.0
1984 76 58 0.00 0.0
1983 78 57 0.00 0.0
1982 91 53 0.00 0.0
1981 86 50 0.00 0.0
1980 77 52 0.00 0.0
1979 78 58 0.00 0.0
1978 82 51 0.00 0.0
1977 79 53 0.00 0.0
1976 79 57 0.00 0.0
1975 82 55 0.00 0.0
1974 94 52 0.00 0.0
1973 80 51 0.00 0.0
1972 92 55 0.00 0.0
1971 81 52 0.00 0.0
1970 71 50 0.00 0.0
1969 100 56 0.00 0.0
1968 72 56 0.08 0.0
1967 86 52 0.00 0.0
1966 72 52 0.00 0.0
1965 80 50 0.00 0.0
1964 89 56 0.00 0.0
1963 86 51 0.00 0.0
1962 86 54 0.00 0.0
1961 83 58 0.00 0.0
1960 84 50 0.00 0.0
1959 76 46 0.00 0.0
1958 84 53 0.00 0.0
1957 81 55 0.00 0.0
1956 78 53 0.00 0.0
1955 80 47 0.00 0.0
1954 85 57 0.00 0.0
1953 79 54 0.00 0.0
1952 82 50 0.00 0.0
1951 76 56 0.00 0.0
1950 77 52 0.00 0.0
1949 85 49 0.00 0.0
1948 81 54 0.00 0.0
1947 87 51 0.00 n/a
1946 84 50 0.00 n/a
1945 97 52 0.00 n/a
1944 75 50 0.00 n/a
1943 84 48 0.00 n/a
1942 89 52 0.00 n/a
1941 75 54 0.00 n/a
1940 80 50 0.00 n/a
1939 84 53 0.00 n/a
1938 78 48 0.00 n/a
1937 76 47 0.00 n/a
1936 70 54 0.00 n/a
1935 79 44 0.00 n/a
1934 79 51 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 84 50 0.00 n/a
1931 90 53 0.00 n/a
1930 89 50 0.00 n/a
1929 84 63 0.00 n/a
1928 73 45 0.00 n/a
1927 80 49 0.00 n/a
1926 73 55 0.00 n/a
1925 73 48 0.00 n/a
1924 67 55 0.00 n/a
1923 81 56 0.00 n/a
1922 79 53 0.00 n/a
1921 79 52 0.00 n/a
1920 75 45 0.00 n/a
1919 73 50 0.00 n/a
1918 93 66 0.00 n/a
1917 83 50 0.00 n/a
1916 n/a n/a n/a n/a
1915 n/a n/a n/a n/a
1914 81 58 0.00 n/a
1913 85 62 0.00 n/a
1912 80 51 n/a n/a
1911 74 51 0.00 n/a
1910 87 46 0.00 n/a
1909 73 48 0.00 n/a
1908 77 54 0.00 n/a
1907 73 55 0.00 n/a
1906 75 55 0.00 n/a
1905 76 60 0.00 n/a
1904 79 50 0.00 n/a
1903 80 46 0.00 n/a
1902 n/a 50 0.00 n/a
1901 71 47 0.00 n/a
What's the all-time high for Napa on 8/21?
For the date of Aug 21, the highest temperature ever reached in Napa history is 100 °F which happened in 1969.
Highest Temperatures in Napa on August 21
Rank Temperature Year
1 100 °F 1969
2 97 °F 1945
3 94 °F 1974
4 93 °F 1918
4 93 °F 2020
6 92 °F 1972
7 91 °F 1982
8 90 °F 2009
8 90 °F 1931
10 89 °F 1964
10 89 °F 1999
10 89 °F 1930
10 89 °F 2007
10 89 °F 1942
10 89 °F 1993
What's the all-time low for Napa on 8/21?
For the date of Aug 21, the lowest temperature ever reached in Napa history is 44 °F which happened in 1935.
Lowest Temperatures in Napa on August 21
Rank Temperature Year
1 44 °F 1935
2 45 °F 1920
2 45 °F 1928
4 46 °F 1959
4 46 °F 1910
4 46 °F 1903
7 47 °F 1937
7 47 °F 1901
7 47 °F 1955
7 47 °F 2001
Lowest High Temperatures in Napa on August 21
Rank Temperature Year
1 67 °F 1924
2 70 °F 1936
2 70 °F 2021
4 71 °F 2018
4 71 °F 2010
4 71 °F 2011
4 71 °F 1970
4 71 °F 1901
9 72 °F 2015
9 72 °F 1966
9 72 °F 2012
9 72 °F 2006
9 72 °F 1968
What's the most it has ever rained in Napa on 8/21?
For the date of Aug 21, the most precipitation ever recorded in Napa history is 0.30 inches which happened in 2003.
All-Time Most Precipitation in Napa on August 21
Rank Precipitation Year
1 0.30 inches 2003
2 0.08 inches 1968
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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