Boise September 30 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of September 30.
September 30 All-Time Records
1911–2023
Highest temperature 96 °F 1992
Lowest temperature 29 °F 1954
Lowest daily high 48 °F 1971
Highest daily low 67 °F 1992
Most precipitation 0.6 inches 1983
Most snow none -
September 30 Average Weather
1991–2020 1
Average high 72.9 °F
Average low 46.8 °F
Chance precipitation 15.4%
Chance snow 0.1%
Boise September 30 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2022 72 48 0.00 0.0
2021 72 42 0.00 0.0
2020 81 51 0.00 0.0
2019 57 34 0.00 0.0
2018 72 55 0.00 0.0
2017 67 50 0.03 0.0
2016 87 64 0.00 0.0
2015 77 55 0.00 0.0
2014 62 50 0.02 0.0
2013 64 48 0.13 0.0
2012 82 54 0.00 0.0
2011 90 56 0.00 0.0
2010 92 55 0.00 0.0
2009 56 40 0.00 0.0
2008 90 57 0.00 0.0
2007 72 42 0.00 0.0
2006 84 49 0.00 0.0
2005 85 54 0.00 0.0
2004 76 51 0.00 0.0
2003 87 58 0.00 0.0
2002 57 40 0.00 0.0
2001 84 49 0.00 0.0
2000 79 52 0.00 0.0
1999 80 44 0.00 0.0
1998 78 50 0.00 0.0
1997 89 52 0.00 0.0
1996 84 52 0.00 0.0
1995 68 38 0.00 0.0
1994 76 52 0.00 0.0
1993 84 50 0.00 0.0
1992 96 67 0.00 0.0
1991 83 53 0.00 0.0
1990 83 52 0.00 0.0
1989 68 52 0.54 0.0
1988 80 47 0.00 0.0
1987 82 44 0.00 0.0
1986 58 39 0.00 0.0
1985 64 35 0.00 0.0
1984 69 43 0.00 0.0
1983 54 48 0.61 0.0
1982 62 34 0.00 0.0
1981 64 32 0.00 0.0
1980 79 47 0.00 0.0
1979 77 48 0.00 0.0
1978 83 50 0.00 0.0
1977 58 41 0.00 0.0
1976 84 49 0.00 0.0
1975 80 48 0.00 0.0
1974 77 46 0.00 0.0
1973 79 50 0.00 0.0
1972 72 38 0.00 0.0
1971 48 42 0.18 0.0
1970 79 47 0.00 0.0
1969 66 48 0.00 0.0
1968 80 53 0.00 0.0
1967 65 51 0.21 0.0
1966 71 45 0.00 0.0
1965 72 40 0.00 0.0
1964 76 49 0.00 0.0
1963 93 62 0.00 0.0
1962 72 39 0.00 0.0
1961 61 33 0.00 0.0
1960 79 44 0.00 0.0
1959 55 40 0.15 0.0
1958 74 40 0.00 0.0
1957 93 60 0.00 0.0
1956 70 43 0.00 0.0
1955 65 34 0.00 0.0
1954 59 29 0.00 0.0
1953 86 47 0.00 0.0
1952 79 48 0.00 0.0
1951 67 54 0.00 0.0
1950 52 32 0.00 0.0
1949 63 44 0.00 0.0
1948 72 39 0.00 0.0
1947 75 49 0.00 0.0
1946 86 53 0.00 0.0
1945 75 38 0.00 0.0
1944 66 44 0.00 0.0
1943 82 47 0.00 0.0
1942 77 45 0.00 0.0
1941 71 43 0.00 0.0
1940 55 46 0.07 0.0
1939 77 36 0.00 0.0
1938 76 49 0.00 0.0
1937 80 35 0.00 0.0
1936 81 39 0.00 0.0
1935 84 41 0.00 0.0
1934 89 50 0.00 0.0
1933 65 30 0.00 0.0
1932 86 n/a 0.00 n/a
1931 75 32 0.00 n/a
1930 70 46 0.00 n/a
1929 73 31 0.00 n/a
1928 76 49 0.01 n/a
1927 60 36 0.11 0.0
1926 64 46 0.00 0.0
1925 61 34 0.12 0.0
1924 84 49 0.00 0.0
1923 80 45 0.00 0.0
1922 81 34 0.00 0.0
1921 67 30 0.00 0.0
1920 88 41 0.00 0.0
1919 67 45 0.42 0.0
1918 73 46 0.20 0.0
1917 80 50 0.00 0.0
1916 70 36 0.00 0.0
1915 78 33 0.00 0.0
1914 80 48 0.00 0.0
1913 70 41 0.00 0.0
1912 87 44 0.00 0.0
1911 72 37 0.00 0.0
All-Time Highest Temperatures in Boise on September 30
Rank Temperature Year
1 96 °F 1992
2 93 °F 1963
2 93 °F 1957
4 92 °F 2010
5 90 °F 2008
5 90 °F 2011
7 89 °F 1997
7 89 °F 1934
9 88 °F 1920
10 87 °F 1912
10 87 °F 2016
10 87 °F 2003
All-Time Lowest Temperatures in Boise on September 30
Rank Temperature Year
1 29 °F 1954
2 30 °F 1921
2 30 °F 1933
4 31 °F 1929
5 32 °F 1981
5 32 °F 1931
5 32 °F 1950
8 33 °F 1915
8 33 °F 1961
10 34 °F 2019
10 34 °F 1925
10 34 °F 1982
10 34 °F 1955
10 34 °F 1922
Lowest High Temperatures in Boise on September 30
Rank Temperature Year
1 48 °F 1971
2 52 °F 1950
3 54 °F 1983
4 55 °F 1940
4 55 °F 1959
6 56 °F 2009
7 57 °F 2002
7 57 °F 2019
9 58 °F 1986
9 58 °F 1977
All-Time Most Precipitation in Boise on September 30
Rank Precipitation Year
1 0.6 inches 1983
2 0.5 inches 1989
3 0.4 inches 1919
4 0.2 inches 1967
5 0.2 inches 1918
6 0.2 inches 1971
7 0.1 inches 1959
8 0.1 inches 2013
9 0.1 inches 1925
10 0.1 inches 1927
Weather Station Details
Years Station Coordinates
1940–2023 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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