Napa September 18 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of September 18.
September 18 All-Time Records
1901–2024
Highest temperature 103 °F 1912
Lowest temperature 38 °F 2008
Lowest daily high 64 °F 1925
Highest daily low 64 °F 1956
Most precipitation 1.87 inches 1959
September 18 Average Weather
1991–2020 1
Average high 80.5 °F
Average low 50.5 °F
Chance precipitation 3.2%
Napa September 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 79 56 0.00 n/a
2022 71 61 0.59 n/a
2021 70 57 0.00 n/a
2020 82 61 0.00 n/a
2019 78 51 0.00 n/a
2018 73 51 0.00 n/a
2017 80 53 0.00 0.0
2016 98 50 0.00 n/a
2015 81 46 0.00 n/a
2014 78 59 0.04 n/a
2013 85 47 0.00 n/a
2012 75 47 0.00 n/a
2011 90 47 0.00 n/a
2010 75 58 0.00 n/a
2009 95 53 0.00 n/a
2008 73 38 0.00 n/a
2007 74 53 0.00 n/a
2006 86 48 0.00 n/a
2005 79 42 0.00 n/a
2004 74 50 0.00 n/a
2003 91 43 0.00 n/a
2002 95 46 0.00 n/a
2001 68 51 0.00 n/a
2000 97 54 0.00 n/a
1999 68 51 0.00 n/a
1998 82 50 0.00 0.0
1997 79 55 0.00 0.0
1996 85 52 0.00 0.0
1995 90 55 0.00 0.0
1994 78 49 0.00 0.0
1993 74 52 0.00 0.0
1992 80 50 0.00 0.0
1991 86 51 0.00 0.0
1990 79 58 0.00 0.0
1989 67 54 0.15 0.0
1988 88 59 0.00 0.0
1987 80 48 0.00 0.0
1986 74 48 0.00 0.0
1985 78 48 0.00 0.0
1984 97 63 0.00 0.0
1983 78 52 0.00 0.0
1982 73 57 0.10 0.0
1981 83 53 0.00 0.0
1980 77 56 0.00 0.0
1979 84 53 0.00 0.0
1978 77 46 0.00 0.0
1977 76 55 0.00 0.0
1976 79 51 0.00 0.0
1975 74 51 0.00 0.0
1974 81 50 0.00 0.0
1973 79 51 0.00 0.0
1972 74 46 0.00 0.0
1971 85 49 0.00 0.0
1970 88 53 0.00 0.0
1969 78 60 0.00 0.0
1968 90 55 0.00 0.0
1967 89 58 0.09 0.0
1966 84 60 0.06 0.0
1965 79 49 0.00 0.0
1964 86 49 0.00 0.0
1963 75 56 0.00 0.0
1962 80 56 0.00 0.0
1961 81 48 0.00 0.0
1960 83 45 0.00 0.0
1959 66 58 1.87 0.0
1958 94 51 0.00 0.0
1957 n/a 51 0.00 0.0
1956 82 64 0.08 0.0
1955 79 45 0.14 0.0
1954 85 44 0.00 0.0
1953 77 57 0.00 0.0
1952 85 49 0.00 0.0
1951 77 52 0.06 0.0
1950 73 55 0.00 0.0
1949 95 49 0.00 0.0
1948 77 57 0.00 0.0
1947 79 44 0.00 n/a
1946 92 52 0.00 n/a
1945 73 54 0.00 n/a
1944 77 43 0.00 n/a
1943 90 44 0.00 n/a
1942 83 48 0.00 n/a
1941 76 53 0.00 n/a
1940 78 53 0.00 n/a
1939 101 53 0.00 n/a
1938 77 52 0.00 n/a
1937 75 46 0.00 n/a
1936 91 49 0.00 n/a
1935 83 53 0.00 n/a
1934 85 52 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 78 44 0.00 n/a
1931 76 48 0.00 n/a
1930 77 49 0.00 n/a
1929 79 49 0.00 n/a
1928 83 47 0.00 n/a
1927 75 46 0.00 n/a
1926 70 42 0.00 n/a
1925 64 51 0.12 n/a
1924 75 49 0.00 n/a
1923 73 55 0.00 n/a
1922 94 46 0.00 n/a
1921 66 56 n/a n/a
1920 79 53 0.00 n/a
1919 101 49 0.00 n/a
1918 74 56 0.00 n/a
1917 96 46 0.00 n/a
1916 n/a n/a n/a n/a
1915 n/a n/a n/a n/a
1914 83 49 0.00 n/a
1913 102 61 0.00 n/a
1912 103 63 0.00 n/a
1911 80 43 0.00 n/a
1910 74 49 0.00 n/a
1909 81 47 n/a n/a
1908 82 48 0.00 n/a
1907 83 48 0.00 n/a
1906 97 55 0.00 n/a
1905 95 52 0.00 n/a
1904 75 49 0.00 n/a
1903 73 48 0.00 n/a
1902 72 54 0.00 n/a
1901 76 47 0.00 n/a
What's the all-time high for Napa on 9/18?
For the date of Sep 18, the highest temperature ever reached in Napa history is 103 °F which happened in 1912.
Highest Temperatures in Napa on September 18
Rank Temperature Year
1 103 °F 1912
2 102 °F 1913
3 101 °F 1939
3 101 °F 1919
5 98 °F 2016
6 97 °F 2000
6 97 °F 1906
6 97 °F 1984
9 96 °F 1917
10 95 °F 1905
10 95 °F 1949
10 95 °F 2009
10 95 °F 2002
What's the all-time low for Napa on 9/18?
For the date of Sep 18, the lowest temperature ever reached in Napa history is 38 °F which happened in 2008.
Lowest Temperatures in Napa on September 18
Rank Temperature Year
1 38 °F 2008
2 42 °F 1926
2 42 °F 2005
4 43 °F 1911
4 43 °F 2003
4 43 °F 1944
7 44 °F 1947
7 44 °F 1932
7 44 °F 1943
7 44 °F 1954
Lowest High Temperatures in Napa on September 18
Rank Temperature Year
1 64 °F 1925
2 66 °F 1921
2 66 °F 1959
4 67 °F 1989
5 68 °F 2001
5 68 °F 1999
7 70 °F 2021
7 70 °F 1926
9 71 °F 2022
10 72 °F 1902
What's the most it has ever rained in Napa on 9/18?
For the date of Sep 18, the most precipitation ever recorded in Napa history is 1.87 inches which happened in 1959.
All-Time Most Precipitation in Napa on September 18
Rank Precipitation Year
1 1.87 inches 1959
2 0.59 inches 2022
3 0.15 inches 1989
4 0.14 inches 1955
5 0.12 inches 1925
6 0.10 inches 1982
7 0.09 inches 1967
8 0.08 inches 1956
9 0.06 inches 1951
9 0.06 inches 1966
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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