Boise September 20 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of September 20.
September 20 All-Time Records
1911–2024
Highest temperature 96 °F 1922
Lowest temperature 33 °F 1983
Lowest daily high 49 °F 1968
Highest daily low 58 °F 1963
Most precipitation 0.90 inches 2008
Most snow none -
September 20 Average Weather
1991–2020 1
Average high 77.9 °F
Average low 50.6 °F
Chance precipitation 14.6%
Chance snow 0%
Boise September 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 71 47 0.00 0.0
2022 86 56 0.00 0.0
2021 67 41 0.00 0.0
2020 80 50 0.00 0.0
2019 69 49 0.01 0.0
2018 73 44 0.00 0.0
2017 63 48 0.08 0.0
2016 77 50 0.00 0.0
2015 86 50 0.00 0.0
2014 88 54 0.00 0.0
2013 88 51 0.00 0.0
2012 78 56 0.00 0.0
2011 82 50 0.00 0.0
2010 72 48 0.00 0.0
2009 70 51 0.00 0.0
2008 69 54 0.90 0.0
2007 72 45 0.00 0.0
2006 66 47 0.02 0.0
2005 85 51 0.00 0.0
2004 65 43 0.00 0.0
2003 73 43 0.00 0.0
2002 74 46 0.00 0.0
2001 86 50 0.00 0.0
2000 77 48 0.00 0.0
1999 84 56 0.00 0.0
1998 68 43 0.00 0.0
1997 74 44 0.00 0.0
1996 70 46 0.00 0.0
1995 76 47 0.00 0.0
1994 86 51 0.00 0.0
1993 64 36 0.00 0.0
1992 79 43 0.00 0.0
1991 84 50 0.00 0.0
1990 77 42 0.00 0.0
1989 75 38 0.00 0.0
1988 65 45 0.00 0.0
1987 85 46 0.00 0.0
1986 56 40 0.16 0.0
1985 67 38 0.00 0.0
1984 75 53 0.49 0.0
1983 63 33 0.00 0.0
1982 68 47 0.18 0.0
1981 72 41 0.00 0.0
1980 61 48 0.06 0.0
1979 89 56 0.00 0.0
1978 68 41 0.00 0.0
1977 59 46 0.30 0.0
1976 74 49 0.00 0.0
1975 73 40 0.00 0.0
1974 86 49 0.00 0.0
1973 68 49 0.14 0.0
1972 66 37 0.00 0.0
1971 71 43 0.00 0.0
1970 59 43 0.18 0.0
1969 65 48 0.14 0.0
1968 49 38 0.03 0.0
1967 87 52 0.00 0.0
1966 89 52 0.00 0.0
1965 69 46 0.00 0.0
1964 63 46 0.04 0.0
1963 74 58 0.07 0.0
1962 81 47 0.00 0.0
1961 67 46 0.00 0.0
1960 69 46 0.00 0.0
1959 60 43 0.13 0.0
1958 65 38 0.00 0.0
1957 67 43 0.00 0.0
1956 76 52 0.00 0.0
1955 70 41 0.00 0.0
1954 78 44 0.00 0.0
1953 78 41 0.00 0.0
1952 83 52 0.00 0.0
1951 73 51 0.00 0.0
1950 77 44 0.00 0.0
1949 73 45 0.00 0.0
1948 82 52 0.00 0.0
1947 68 39 0.00 0.0
1946 77 43 0.00 0.0
1945 63 48 0.15 0.0
1944 80 47 0.00 0.0
1943 82 46 0.00 0.0
1942 75 44 0.00 0.0
1941 62 36 0.00 0.0
1940 64 43 0.00 0.0
1939 92 53 0.00 0.0
1938 90 52 0.00 0.0
1937 72 55 0.11 0.0
1936 91 43 0.00 0.0
1935 85 45 0.00 0.0
1934 72 40 0.00 0.0
1933 73 45 0.00 0.0
1932 77 44 0.00 n/a
1931 65 44 0.00 n/a
1930 90 40 0.00 n/a
1929 74 45 0.00 n/a
1928 75 38 0.00 n/a
1927 87 43 0.00 0.0
1926 76 38 0.00 0.0
1925 67 36 0.00 0.0
1924 68 33 0.00 0.0
1923 83 48 0.00 0.0
1922 96 48 0.00 0.0
1921 63 36 0.00 0.0
1920 78 49 0.00 0.0
1919 72 50 0.00 0.0
1918 93 46 0.00 0.0
1917 90 51 0.00 0.0
1916 84 37 0.00 0.0
1915 83 38 0.00 0.0
1914 69 46 0.00 0.0
1913 87 43 0.00 0.0
1912 69 40 0.00 0.0
1911 76 33 0.00 0.0
What's the all-time high for Boise on 9/20?
For the date of Sep 20, the highest temperature ever reached in Boise history is 96 °F which happened in 1922.
Highest Temperatures in Boise on September 20
Rank Temperature Year
1 96 °F 1922
2 93 °F 1918
3 92 °F 1939
4 91 °F 1936
5 90 °F 1930
5 90 °F 1917
5 90 °F 1938
8 89 °F 1979
8 89 °F 1966
10 88 °F 2013
10 88 °F 2014
What's the all-time low for Boise on 9/20?
For the date of Sep 20, the lowest temperature ever reached in Boise history is 33 °F which has happened 3 times, most recently in 1983.
Lowest Temperatures in Boise on September 20
Rank Temperature Year
1 33 °F 1924
1 33 °F 1911
1 33 °F 1983
4 36 °F 1925
4 36 °F 1921
4 36 °F 1993
4 36 °F 1941
8 37 °F 1972
8 37 °F 1916
10 38 °F 1968
10 38 °F 1985
10 38 °F 1958
10 38 °F 1989
10 38 °F 1915
10 38 °F 1928
10 38 °F 1926
Lowest High Temperatures in Boise on September 20
Rank Temperature Year
1 49 °F 1968
2 56 °F 1986
3 59 °F 1977
3 59 °F 1970
5 60 °F 1959
6 61 °F 1980
7 62 °F 1941
8 63 °F 1945
8 63 °F 1964
8 63 °F 1921
8 63 °F 1983
8 63 °F 2017
What's the most it has ever rained in Boise on 9/20?
For the date of Sep 20, the most precipitation ever recorded in Boise history is 0.90 inches which happened in 2008.
All-Time Most Precipitation in Boise on September 20
Rank Precipitation Year
1 0.90 inches 2008
2 0.49 inches 1984
3 0.30 inches 1977
4 0.18 inches 1982
4 0.18 inches 1970
6 0.16 inches 1986
7 0.15 inches 1945
8 0.14 inches 1973
8 0.14 inches 1969
10 0.13 inches 1959
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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