Boise September 18 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of September 18.
September 18 All-Time Records
1911–2024
Highest temperature 97 °F 1938
Lowest temperature 27 °F 1965
Lowest daily high 54 °F 1978
Highest daily low 64 °F 2014
Most precipitation 0.41 inches 1959
Most snow none -
September 18 Average Weather
1991–2020 1
Average high 79.0 °F
Average low 51.4 °F
Chance precipitation 13.6%
Chance snow 0%
Boise September 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 86 60 0.00 0.0
2022 78 56 0.00 0.0
2021 85 62 0.01 0.0
2020 77 61 0.01 0.0
2019 61 50 0.04 0.0
2018 79 44 0.00 0.0
2017 66 48 0.21 0.0
2016 82 59 0.00 0.0
2015 70 46 0.00 0.0
2014 87 64 0.00 0.0
2013 67 50 0.00 0.0
2012 86 55 0.00 0.0
2011 80 58 0.00 0.0
2010 86 59 0.00 0.0
2009 88 54 0.00 0.0
2008 90 62 0.00 0.0
2007 63 48 0.11 0.0
2006 80 47 0.00 0.0
2005 69 45 0.00 0.0
2004 66 52 0.00 0.0
2003 70 43 0.00 0.0
2002 69 46 0.00 0.0
2001 86 59 0.00 0.0
2000 86 54 0.00 0.0
1999 86 54 0.00 0.0
1998 76 57 0.00 0.0
1997 68 45 0.00 0.0
1996 64 39 0.00 0.0
1995 84 56 0.00 0.0
1994 88 55 0.00 0.0
1993 72 44 0.00 0.0
1992 77 38 0.00 0.0
1991 83 48 0.00 0.0
1990 78 45 0.00 0.0
1989 62 44 0.00 0.0
1988 63 28 0.00 0.0
1987 79 40 0.00 0.0
1986 63 44 0.00 0.0
1985 62 36 0.00 0.0
1984 90 55 0.00 0.0
1983 80 40 0.00 0.0
1982 85 49 0.00 0.0
1981 96 64 0.00 0.0
1980 74 53 0.16 0.0
1979 91 57 0.00 0.0
1978 54 38 0.05 0.0
1977 79 50 0.00 0.0
1976 65 55 0.02 0.0
1975 70 38 0.00 0.0
1974 84 46 0.00 0.0
1973 77 47 0.00 0.0
1972 86 57 0.00 0.0
1971 66 41 0.00 0.0
1970 85 53 0.00 0.0
1969 81 60 0.01 0.0
1968 85 50 0.00 0.0
1967 83 49 0.00 0.0
1966 77 55 0.01 0.0
1965 56 27 0.00 0.0
1964 63 37 0.00 0.0
1963 68 47 0.01 0.0
1962 87 52 0.00 0.0
1961 65 51 0.23 0.0
1960 86 49 0.00 0.0
1959 64 53 0.41 0.0
1958 75 46 0.00 0.0
1957 62 41 0.06 0.0
1956 83 52 0.00 0.0
1955 71 38 0.00 0.0
1954 70 38 0.00 0.0
1953 75 44 0.00 0.0
1952 89 51 0.00 0.0
1951 84 53 0.00 0.0
1950 77 51 0.00 0.0
1949 82 43 0.00 0.0
1948 68 53 0.16 0.0
1947 58 36 0.00 0.0
1946 65 36 0.00 0.0
1945 63 44 0.00 0.0
1944 59 41 0.00 0.0
1943 70 48 0.00 0.0
1942 65 34 0.00 0.0
1941 79 49 0.00 0.0
1940 61 51 0.19 0.0
1939 86 44 0.00 0.0
1938 97 52 0.00 0.0
1937 93 58 0.00 0.0
1936 83 37 0.00 0.0
1935 80 42 0.00 0.0
1934 82 43 0.00 0.0
1933 70 54 0.00 0.0
1932 67 40 0.00 n/a
1931 82 52 0.12 n/a
1930 94 45 0.00 n/a
1929 81 42 0.00 n/a
1928 90 48 0.00 n/a
1927 82 40 0.00 0.0
1926 70 29 0.00 0.0
1925 72 38 0.00 0.0
1924 n/a n/a 0.00 0.0
1923 77 35 0.00 0.0
1922 89 44 0.00 0.0
1921 67 53 0.04 0.0
1920 80 56 0.03 0.0
1919 80 51 0.00 0.0
1918 84 48 0.00 0.0
1917 95 48 0.00 0.0
1916 87 46 0.00 0.0
1915 86 39 0.00 0.0
1914 86 48 0.00 0.0
1913 81 52 0.00 0.0
1912 83 41 0.00 0.0
1911 73 31 0.00 0.0
What's the all-time high for Boise on 9/18?
For the date of Sep 18, the highest temperature ever reached in Boise history is 97 °F which happened in 1938.
Highest Temperatures in Boise on September 18
Rank Temperature Year
1 97 °F 1938
2 96 °F 1981
3 95 °F 1917
4 94 °F 1930
5 93 °F 1937
6 91 °F 1979
7 90 °F 2008
7 90 °F 1928
7 90 °F 1984
10 89 °F 1922
10 89 °F 1952
What's the all-time low for Boise on 9/18?
For the date of Sep 18, the lowest temperature ever reached in Boise history is 27 °F which happened in 1965.
Lowest Temperatures in Boise on September 18
Rank Temperature Year
1 27 °F 1965
2 28 °F 1988
3 29 °F 1926
4 31 °F 1911
5 34 °F 1942
6 35 °F 1923
7 36 °F 1985
7 36 °F 1947
7 36 °F 1946
10 37 °F 1964
10 37 °F 1936
Lowest High Temperatures in Boise on September 18
Rank Temperature Year
1 54 °F 1978
2 56 °F 1965
3 58 °F 1947
4 59 °F 1944
5 61 °F 2019
5 61 °F 1940
7 62 °F 1989
7 62 °F 1957
7 62 °F 1985
10 63 °F 2007
10 63 °F 1988
10 63 °F 1986
10 63 °F 1945
10 63 °F 1964
What's the most it has ever rained in Boise on 9/18?
For the date of Sep 18, the most precipitation ever recorded in Boise history is 0.41 inches which happened in 1959.
All-Time Most Precipitation in Boise on September 18
Rank Precipitation Year
1 0.41 inches 1959
2 0.23 inches 1961
3 0.21 inches 2017
4 0.19 inches 1940
5 0.16 inches 1948
5 0.16 inches 1980
7 0.12 inches 1931
8 0.11 inches 2007
9 0.06 inches 1957
10 0.05 inches 1978
Weather Station Details
Years Station Coordinates
1940–2024 location
1911–1939 Meridian 1 W location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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