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
1940–2022
Highest temperature 96 °F 1981
Lowest temperature 27 °F 1965
Lowest daily high 54 °F 1978
Highest daily low 64 °F 2014
Most precipitation 0.4 inches 1959
Most snow none -
September 18 Average Weather
1991–2020 1
Average high 79.0 °F
Average low 51.4 °F
Chance precipitation 13.7%
Chance snow 0%
Boise September 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
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
All-Time Highest Temperatures in Boise on September 18
Rank Temperature Year
1 96 °F 1981
2 91 °F 1979
3 90 °F 2008
3 90 °F 1984
5 89 °F 1952
6 88 °F 1994
6 88 °F 2009
8 87 °F 1962
8 87 °F 2014
10 86 °F 2001
10 86 °F 1960
10 86 °F 2010
10 86 °F 2012
10 86 °F 1972
10 86 °F 2000
10 86 °F 1999
All-Time Lowest Temperatures in Boise on September 18
Rank Temperature Year
1 27 °F 1965
2 28 °F 1988
3 34 °F 1942
4 36 °F 1985
4 36 °F 1947
4 36 °F 1946
7 37 °F 1964
8 38 °F 1978
8 38 °F 1955
8 38 °F 1992
8 38 °F 1954
8 38 °F 1975
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 1940
5 61 °F 2019
7 62 °F 1989
7 62 °F 1985
7 62 °F 1957
10 63 °F 2007
10 63 °F 1964
10 63 °F 1988
10 63 °F 1945
10 63 °F 1986
All-Time Most Precipitation in Boise on September 18
Rank Precipitation Year
1 0.4 inches 1959
2 0.2 inches 1961
3 0.2 inches 2017
4 0.2 inches 1940
5 0.2 inches 1948
5 0.2 inches 1980
7 0.1 inches 2007
8 0.1 inches 1957
9 0.1 inches 1978
10 0.0 inches 2019
Weather Station Details
Years Station Coordinates
1940–2022 location