Napa August 18 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of August 18.
August 18 All-Time Records
1901–2024
Highest temperature 103 °F 1934
Lowest temperature 45 °F 1919
Lowest daily high 66 °F 1959
Highest daily low 65 °F 2020
Most precipitation 0.32 inches 1976
August 18 Average Weather
1991–2020 1
Average high 80.6 °F
Average low 53.7 °F
Chance precipitation 0.8%
Napa August 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 78 63 0.00 n/a
2022 83 55 0.00 n/a
2021 74 53 0.00 n/a
2020 94 65 0.00 n/a
2019 74 50 0.00 n/a
2018 83 47 0.00 n/a
2017 78 57 0.00 n/a
2016 76 55 0.00 n/a
2015 76 56 0.00 n/a
2014 72 55 0.00 n/a
2013 91 59 0.00 0.0
2012 80 56 0.00 n/a
2011 73 54 0.00 n/a
2010 76 50 0.00 n/a
2009 75 51 0.00 n/a
2008 73 58 0.00 n/a
2007 84 46 0.00 n/a
2006 74 51 0.00 n/a
2005 71 54 0.00 n/a
2004 82 58 0.00 n/a
2003 77 56 0.00 n/a
2002 74 52 0.00 n/a
2001 78 52 0.00 n/a
2000 83 49 0.00 n/a
1999 75 51 0.00 n/a
1998 76 55 0.00 0.0
1997 80 53 0.00 0.0
1996 77 53 0.00 0.0
1995 86 52 0.00 0.0
1994 82 55 0.00 0.0
1993 79 57 0.00 0.0
1992 87 53 0.00 0.0
1991 76 54 0.00 0.0
1990 80 61 0.00 0.0
1989 75 53 0.00 0.0
1988 90 52 0.00 0.0
1987 80 52 0.00 0.0
1986 87 52 0.00 0.0
1985 79 49 0.00 0.0
1984 86 56 0.00 0.0
1983 77 57 0.06 0.0
1982 82 56 0.00 0.0
1981 72 54 0.00 0.0
1980 70 51 0.00 0.0
1979 84 54 0.00 0.0
1978 87 50 0.00 0.0
1977 82 52 0.00 0.0
1976 69 58 0.32 0.0
1975 75 58 0.00 0.0
1974 83 49 0.00 0.0
1973 77 50 0.00 0.0
1972 82 58 0.00 0.0
1971 81 58 0.00 0.0
1970 76 52 0.00 0.0
1969 73 51 0.00 0.0
1968 80 57 0.00 0.0
1967 89 55 0.00 0.0
1966 85 55 0.00 0.0
1965 74 57 0.00 0.0
1964 83 52 0.00 0.0
1963 91 50 0.00 0.0
1962 85 52 0.00 0.0
1961 93 50 0.00 0.0
1960 90 55 0.00 0.0
1959 66 52 0.00 0.0
1958 80 56 0.00 0.0
1957 80 54 0.00 0.0
1956 73 55 0.00 0.0
1955 77 49 0.00 0.0
1954 77 54 0.00 0.0
1953 82 52 0.00 0.0
1952 89 57 0.00 0.0
1951 83 55 0.00 0.0
1950 99 55 0.00 0.0
1949 82 47 0.00 0.0
1948 80 55 0.00 0.0
1947 82 55 0.00 n/a
1946 84 53 0.00 n/a
1945 91 57 0.00 n/a
1944 79 49 0.00 n/a
1943 76 52 0.00 n/a
1942 87 49 0.00 n/a
1941 96 58 0.00 n/a
1940 80 50 0.00 n/a
1939 78 53 0.00 n/a
1938 72 53 0.00 n/a
1937 85 47 0.00 n/a
1936 78 51 0.00 n/a
1935 83 49 0.00 n/a
1934 103 52 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 90 46 0.00 n/a
1931 82 48 0.00 n/a
1930 84 51 0.00 n/a
1929 83 57 0.00 n/a
1928 74 46 0.00 n/a
1927 74 53 0.00 n/a
1926 82 55 0.00 n/a
1925 73 46 0.00 n/a
1924 70 50 0.00 n/a
1923 73 50 0.00 n/a
1922 79 47 0.00 n/a
1921 81 48 0.00 n/a
1920 79 49 0.00 n/a
1919 86 45 0.00 n/a
1918 81 46 0.00 n/a
1917 81 50 0.00 n/a
1916 n/a n/a n/a n/a
1915 n/a n/a n/a n/a
1914 69 56 0.00 n/a
1913 93 55 0.00 n/a
1912 87 53 n/a n/a
1911 78 47 0.00 n/a
1910 72 n/a 0.00 n/a
1909 82 57 0.00 n/a
1908 82 55 0.00 n/a
1907 87 57 0.00 n/a
1906 74 56 0.00 n/a
1905 86 58 0.00 n/a
1904 76 55 0.00 n/a
1903 88 52 0.00 n/a
1902 92 53 0.00 n/a
1901 70 51 0.00 n/a
What's the all-time high for Napa on 8/18?
For the date of Aug 18, the highest temperature ever reached in Napa history is 103 °F which happened in 1934.
Highest Temperatures in Napa on August 18
Rank Temperature Year
1 103 °F 1934
2 99 °F 1950
3 96 °F 1941
4 94 °F 2020
5 93 °F 1913
5 93 °F 1961
7 92 °F 1902
8 91 °F 1963
8 91 °F 1945
8 91 °F 2013
What's the all-time low for Napa on 8/18?
For the date of Aug 18, the lowest temperature ever reached in Napa history is 45 °F which happened in 1919.
Lowest Temperatures in Napa on August 18
Rank Temperature Year
1 45 °F 1919
2 46 °F 1918
2 46 °F 2007
2 46 °F 1928
2 46 °F 1925
2 46 °F 1932
7 47 °F 2018
7 47 °F 1911
7 47 °F 1937
7 47 °F 1922
7 47 °F 1949
Lowest High Temperatures in Napa on August 18
Rank Temperature Year
1 66 °F 1959
2 69 °F 1914
2 69 °F 1976
4 70 °F 1901
4 70 °F 1924
4 70 °F 1980
7 71 °F 2005
8 72 °F 1938
8 72 °F 2014
8 72 °F 1910
8 72 °F 1981
What's the most it has ever rained in Napa on 8/18?
For the date of Aug 18, the most precipitation ever recorded in Napa history is 0.32 inches which happened in 1976.
All-Time Most Precipitation in Napa on August 18
Rank Precipitation Year
1 0.32 inches 1976
2 0.06 inches 1983
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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