Napa May 18 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of May 18.
May 18 All-Time Records
1901–2024
Highest temperature 100 °F 1997
Lowest temperature 30 °F 1974
Lowest daily high 56 °F 2019
Highest daily low 61 °F 1931
Most precipitation 0.90 inches 1925
May 18 Average Weather
1991–2020 1
Average high 73.5 °F
Average low 47.7 °F
Chance precipitation 11.1%
Napa May 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 71 52 0.00 n/a
2022 91 45 0.00 n/a
2021 80 40 0.00 n/a
2020 67 49 0.14 n/a
2019 56 46 0.28 n/a
2018 68 47 0.00 n/a
2017 83 42 0.00 n/a
2016 78 54 0.00 n/a
2015 67 49 0.00 n/a
2014 73 52 0.00 n/a
2013 78 39 0.00 n/a
2012 75 41 0.00 n/a
2011 67 46 0.04 n/a
2010 68 51 0.00 n/a
2009 70 48 0.00 n/a
2008 77 48 0.00 n/a
2007 76 40 0.00 n/a
2006 70 50 0.00 n/a
2005 64 55 0.33 n/a
2004 72 49 0.00 n/a
2003 74 42 0.00 n/a
2002 67 46 0.00 n/a
2001 81 46 0.00 n/a
2000 78 48 0.00 n/a
1999 68 46 0.00 n/a
1998 75 42 0.00 0.0
1997 100 60 0.00 0.0
1996 65 54 0.48 0.0
1995 75 53 0.00 0.0
1994 69 46 0.00 0.0
1993 76 50 0.00 0.0
1992 76 51 0.00 0.0
1991 67 45 0.00 0.0
1990 68 48 0.00 0.0
1989 72 44 0.00 0.0
1988 82 47 0.00 0.0
1987 68 51 0.00 0.0
1986 89 49 0.00 0.0
1985 75 46 0.00 0.0
1984 80 46 0.00 0.0
1983 84 52 0.00 0.0
1982 76 41 0.00 0.0
1981 69 40 0.33 0.0
1980 79 45 0.00 0.0
1979 n/a n/a n/a n/a
1978 91 48 0.00 0.0
1977 69 40 0.05 0.0
1976 72 40 0.00 0.0
1975 81 51 0.00 0.0
1974 62 30 0.02 0.0
1973 88 52 0.00 0.0
1972 64 41 0.00 0.0
1971 80 45 0.00 0.0
1970 68 48 0.00 0.0
1969 74 54 0.00 0.0
1968 79 48 0.00 0.0
1967 85 50 0.00 0.0
1966 89 51 0.00 0.0
1965 74 48 0.00 0.0
1964 72 42 0.00 0.0
1963 88 47 0.00 0.0
1962 70 48 0.00 0.0
1961 70 47 0.00 0.0
1960 77 48 0.00 0.0
1959 79 40 0.00 0.0
1958 77 49 0.00 0.0
1957 61 56 0.40 0.0
1956 74 51 0.00 0.0
1955 94 58 0.00 0.0
1954 77 46 0.00 0.0
1953 76 41 0.00 0.0
1952 90 50 0.00 0.0
1951 72 50 0.00 0.0
1950 75 42 0.00 0.0
1949 68 49 0.03 0.0
1948 66 33 0.00 n/a
1947 89 45 0.00 n/a
1946 n/a n/a 0.00 n/a
1945 67 40 0.00 n/a
1944 71 45 0.00 n/a
1943 87 50 0.00 n/a
1942 80 42 0.00 n/a
1941 76 39 0.00 n/a
1940 78 52 0.00 n/a
1939 69 39 0.00 n/a
1938 74 44 0.00 n/a
1937 71 44 0.00 n/a
1936 64 51 0.00 n/a
1935 76 39 0.00 n/a
1934 77 40 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 69 48 0.00 n/a
1931 90 61 0.00 n/a
1930 78 48 0.00 n/a
1929 67 48 0.00 n/a
1928 63 47 0.00 n/a
1927 62 40 0.00 n/a
1926 82 54 0.00 n/a
1925 64 55 0.90 n/a
1924 70 50 0.00 n/a
1923 63 45 0.00 n/a
1922 64 51 0.00 n/a
1921 66 39 0.00 n/a
1920 91 49 0.00 n/a
1919 74 43 0.00 n/a
1918 69 36 0.00 n/a
1917 65 34 0.00 n/a
1916 n/a n/a 0.00 n/a
1915 n/a n/a n/a n/a
1914 67 53 0.00 n/a
1913 66 52 0.00 n/a
1912 76 52 0.00 n/a
1911 67 51 0.05 0.0
1910 69 50 0.00 0.0
1909 67 43 0.00 n/a
1908 66 44 0.09 n/a
1907 72 45 0.00 n/a
1906 72 46 n/a n/a
1905 76 48 n/a n/a
1904 75 45 0.00 n/a
1903 70 42 0.00 n/a
1902 72 47 0.00 n/a
1901 61 41 0.00 n/a
What's the all-time high for Napa on 5/18?
For the date of May 18, the highest temperature ever reached in Napa history is 100 °F which happened in 1997.
Highest Temperatures in Napa on May 18
Rank Temperature Year
1 100 °F 1997
2 94 °F 1955
3 91 °F 1920
3 91 °F 2022
3 91 °F 1978
6 90 °F 1952
6 90 °F 1931
8 89 °F 1966
8 89 °F 1986
8 89 °F 1947
What's the all-time low for Napa on 5/18?
For the date of May 18, the lowest temperature ever reached in Napa history is 30 °F which happened in 1974.
Lowest Temperatures in Napa on May 18
Rank Temperature Year
1 30 °F 1974
2 33 °F 1948
3 34 °F 1917
4 36 °F 1918
5 39 °F 2013
5 39 °F 1921
5 39 °F 1935
5 39 °F 1939
5 39 °F 1941
10 40 °F 1976
10 40 °F 1934
10 40 °F 1927
10 40 °F 2007
10 40 °F 1945
10 40 °F 1977
10 40 °F 2021
10 40 °F 1981
10 40 °F 1959
Lowest High Temperatures in Napa on May 18
Rank Temperature Year
1 56 °F 2019
2 61 °F 1957
2 61 °F 1901
4 62 °F 1974
4 62 °F 1927
6 63 °F 1923
6 63 °F 1928
8 64 °F 1922
8 64 °F 1936
8 64 °F 1972
8 64 °F 2005
8 64 °F 1925
What's the most it has ever rained in Napa on 5/18?
For the date of May 18, the most precipitation ever recorded in Napa history is 0.90 inches which happened in 1925.
All-Time Most Precipitation in Napa on May 18
Rank Precipitation Year
1 0.90 inches 1925
2 0.48 inches 1996
3 0.40 inches 1957
4 0.33 inches 1981
4 0.33 inches 2005
6 0.28 inches 2019
7 0.14 inches 2020
8 0.09 inches 1908
9 0.05 inches 1911
9 0.05 inches 1977
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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