Casper September 18 Weather Records

Daily averages and all-time records for weather in Casper, Wyoming for the date of September 18.
September 18 All-Time Records
1900–2024
Highest temperature 101 °F 1911
Lowest temperature 19 °F 1965
Lowest daily high 35 °F 1965
Highest daily low 66 °F 1920
Most precipitation 0.55 inches 2002
Most snow none -
September 18 Average Weather
1991–2020 1
Average high 74.5 °F
Average low 41.7 °F
Chance precipitation 24.3%
Chance snow 2.5%
Casper September 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 83 47 0.00 0.0
2022 80 45 0.00 0.0
2021 86 51 0.00 0.0
2020 83 38 0.00 0.0
2019 80 37 0.00 0.0
2018 87 42 0.00 0.0
2017 79 41 0.00 0.0
2016 83 53 0.00 0.0
2015 65 36 0.00 0.0
2014 92 43 0.00 0.0
2013 80 39 0.04 0.0
2012 80 37 0.00 0.0
2011 74 38 0.00 0.0
2010 65 36 0.01 0.0
2009 84 38 0.00 0.0
2008 84 55 0.00 0.0
2007 69 39 0.00 0.0
2006 62 37 0.00 0.0
2005 76 38 0.00 0.0
2004 86 49 0.00 0.0
2003 54 30 0.00 0.0
2002 56 43 0.55 0.0
2001 72 48 0.00 0.0
2000 83 57 0.00 0.0
1999 84 43 0.01 0.0
1998 88 51 0.00 n/a
1997 69 46 0.04 n/a
1996 52 36 0.19 n/a
1995 66 42 0.29 0.0
1994 83 48 0.00 0.0
1993 57 47 0.01 0.0
1992 76 31 0.00 0.0
1991 63 31 0.00 0.0
1990 75 43 0.00 0.0
1989 73 51 0.05 0.0
1988 61 35 0.01 0.0
1987 71 29 0.00 0.0
1986 70 48 0.00 0.0
1985 80 43 0.13 0.0
1984 86 51 0.00 0.0
1983 77 31 0.00 0.0
1982 74 40 0.00 0.0
1981 86 43 0.00 0.0
1980 89 39 0.00 0.0
1979 86 40 0.00 0.0
1978 55 32 0.01 0.0
1977 70 36 0.00 0.0
1976 78 52 0.01 0.0
1975 55 36 0.05 0.0
1974 78 44 0.00 0.0
1973 77 38 0.00 0.0
1972 84 46 0.00 0.0
1971 51 24 0.00 0.0
1970 83 45 0.00 0.0
1969 81 45 0.00 0.0
1968 80 48 0.00 0.0
1967 55 42 0.20 0.0
1966 83 40 0.00 0.0
1965 35 19 0.00 0.0
1964 67 41 0.00 0.0
1963 65 46 0.04 0.0
1962 81 42 0.00 0.0
1961 74 46 0.04 0.0
1960 75 48 0.00 0.0
1959 69 42 0.00 0.0
1958 77 51 0.00 0.0
1957 51 35 0.07 0.0
1956 83 44 0.00 0.0
1955 70 48 0.03 0.0
1954 73 43 0.00 0.0
1953 75 38 0.00 0.0
1952 77 45 0.00 0.0
1951 77 51 0.00 0.0
1950 75 46 0.00 0.0
1949 74 37 0.00 0.0
1948 81 64 0.00 0.0
1947 n/a n/a n/a n/a
1946 n/a n/a n/a n/a
1945 n/a n/a n/a n/a
1944 n/a n/a n/a n/a
1943 n/a n/a n/a n/a
1942 n/a n/a n/a n/a
1941 n/a n/a n/a n/a
1940 n/a n/a 0.00 n/a
1939 78 48 0.00 0.0
1938 80 32 0.00 0.0
1937 n/a n/a n/a n/a
1936 71 32 0.00 0.0
1935 87 41 0.00 0.0
1934 85 40 0.00 0.0
1933 82 61 0.00 0.0
1932 83 40 0.00 0.0
1931 82 42 0.00 n/a
1930 83 52 n/a n/a
1929 82 40 n/a n/a
1928 83 50 n/a n/a
1927 70 45 n/a n/a
1926 68 36 n/a n/a
1925 82 62 0.02 n/a
1924 75 44 0.00 n/a
1923 59 33 n/a n/a
1922 67 48 0.11 n/a
1921 78 39 0.15 n/a
1920 84 66 0.00 n/a
1919 n/a n/a n/a n/a
1918 n/a n/a n/a n/a
1917 72 38 0.00 0.0
1916 79 33 0.00 n/a
1915 75 28 0.00 0.0
1914 90 44 0.00 0.0
1913 n/a n/a n/a n/a
1912 n/a n/a n/a n/a
1911 101 65 n/a n/a
1910 n/a n/a n/a n/a
1909 n/a n/a n/a n/a
1908 n/a n/a n/a n/a
1907 n/a n/a n/a n/a
1906 n/a n/a n/a n/a
1905 n/a n/a n/a n/a
1904 n/a n/a n/a n/a
1903 n/a n/a n/a n/a
1902 n/a n/a n/a n/a
1901 74 27 0.00 0.0
What's the all-time high for Casper on 9/18?
For the date of Sep 18, the highest temperature ever reached in Casper history is 101 °F which happened in 1911.
Highest Temperatures in Casper on September 18
Rank Temperature Year
1 101 °F 1911
2 92 °F 2014
3 90 °F 1914
4 89 °F 1980
5 88 °F 1998
6 87 °F 2018
6 87 °F 1935
8 86 °F 2021
8 86 °F 2004
8 86 °F 1984
8 86 °F 1981
8 86 °F 1979
What's the all-time low for Casper on 9/18?
For the date of Sep 18, the lowest temperature ever reached in Casper history is 19 °F which happened in 1965.
Lowest Temperatures in Casper on September 18
Rank Temperature Year
1 19 °F 1965
2 24 °F 1971
3 27 °F 1901
4 28 °F 1915
5 29 °F 1987
6 30 °F 2003
7 31 °F 1983
7 31 °F 1992
7 31 °F 1991
10 32 °F 1938
10 32 °F 1936
10 32 °F 1978
Lowest High Temperatures in Casper on September 18
Rank Temperature Year
1 35 °F 1965
2 51 °F 1971
2 51 °F 1957
4 52 °F 1996
5 54 °F 2003
6 55 °F 1975
6 55 °F 1967
6 55 °F 1978
9 56 °F 2002
10 57 °F 1993
What's the most it has ever rained in Casper on 9/18?
For the date of Sep 18, the most precipitation ever recorded in Casper history is 0.55 inches which happened in 2002.
All-Time Most Precipitation in Casper on September 18
Rank Precipitation Year
1 0.55 inches 2002
2 0.29 inches 1995
3 0.20 inches 1967
4 0.19 inches 1996
5 0.15 inches 1921
6 0.13 inches 1985
7 0.11 inches 1922
8 0.07 inches 1957
9 0.05 inches 1975
9 0.05 inches 1989
Weather Station Details
Years Station Coordinates
1949–2024 Casper-Natrona County International Airport location
1900–1948 Casper 2 E location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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