Boise August 20 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of August 20.
August 20 All-Time Records
1911–2024
Highest temperature 103 °F 1967
Lowest temperature 35 °F 1918
Lowest daily high 65 °F 1968
Highest daily low 71 °F 1946
Most precipitation 0.40 inches 1959
Most snow none -
August 20 Average Weather
1991–2020 1
Average high 89.7 °F
Average low 59.7 °F
Chance precipitation 6.9%
Chance snow 0%
Boise August 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 77 69 0.02 0.0
2022 96 68 0.00 0.0
2021 85 56 0.00 0.0
2020 91 67 0.00 0.0
2019 98 64 0.00 0.0
2018 90 62 0.00 0.0
2017 86 54 0.00 0.0
2016 91 59 0.00 0.0
2015 92 61 0.00 0.0
2014 86 65 0.00 0.0
2013 96 60 0.00 0.0
2012 95 64 0.00 0.0
2011 93 55 0.00 0.0
2010 95 60 0.00 0.0
2009 99 68 0.00 0.0
2008 89 63 0.00 0.0
2007 86 52 0.00 0.0
2006 93 57 0.00 0.0
2005 98 66 0.00 0.0
2004 90 63 0.00 0.0
2003 92 63 0.00 0.0
2002 81 60 0.00 0.0
2001 90 57 0.00 0.0
2000 78 53 0.00 0.0
1999 98 62 0.00 0.0
1998 95 61 0.00 0.0
1997 100 66 0.00 0.0
1996 84 56 0.00 0.0
1995 98 55 0.00 0.0
1994 90 54 0.00 0.0
1993 84 63 0.00 0.0
1992 96 60 0.00 0.0
1991 96 67 0.00 0.0
1990 74 52 0.14 0.0
1989 83 52 0.00 0.0
1988 84 52 0.00 0.0
1987 89 53 0.00 0.0
1986 95 59 0.00 0.0
1985 85 52 0.00 0.0
1984 82 46 0.00 0.0
1983 82 59 0.00 0.0
1982 95 64 0.02 0.0
1981 88 58 0.01 0.0
1980 84 51 0.00 0.0
1979 84 54 0.00 0.0
1978 89 52 0.00 0.0
1977 96 70 0.00 0.0
1976 90 57 0.00 0.0
1975 75 55 0.00 0.0
1974 73 49 0.06 0.0
1973 95 60 0.00 0.0
1972 89 55 0.00 0.0
1971 91 67 0.00 0.0
1970 91 58 0.00 0.0
1969 92 53 0.00 0.0
1968 65 50 0.05 0.0
1967 103 67 0.00 0.0
1966 80 50 0.00 0.0
1965 78 56 0.04 0.0
1964 76 47 0.00 0.0
1963 78 48 0.00 0.0
1962 93 58 0.00 0.0
1961 92 70 0.00 0.0
1960 91 54 0.00 0.0
1959 70 52 0.40 0.0
1958 90 62 0.09 0.0
1957 89 55 0.00 0.0
1956 90 57 0.00 0.0
1955 87 55 0.00 0.0
1954 69 52 0.13 0.0
1953 87 63 0.00 0.0
1952 87 49 0.00 0.0
1951 89 59 0.00 0.0
1950 93 59 0.00 0.0
1949 99 62 0.00 0.0
1948 82 50 0.00 0.0
1947 78 62 0.00 0.0
1946 96 71 0.00 0.0
1945 82 53 0.00 0.0
1944 88 50 0.00 0.0
1943 85 50 0.00 0.0
1942 93 67 0.00 0.0
1941 85 57 0.00 0.0
1940 98 69 0.00 0.0
1939 94 56 0.00 0.0
1938 n/a n/a 0.00 0.0
1937 92 50 0.00 0.0
1936 87 47 0.00 0.0
1935 94 43 0.00 0.0
1934 91 47 0.00 n/a
1933 76 54 0.00 0.0
1932 85 n/a 0.00 n/a
1931 85 53 0.00 n/a
1930 92 55 0.00 n/a
1929 90 45 0.00 n/a
1928 89 43 0.00 n/a
1927 90 57 0.00 n/a
1926 80 48 0.00 0.0
1925 96 57 0.00 0.0
1924 74 44 0.00 0.0
1923 82 57 0.00 0.0
1922 89 47 0.00 0.0
1921 94 46 0.00 0.0
1920 87 44 0.00 0.0
1919 94 50 0.00 0.0
1918 67 35 0.00 0.0
1917 94 51 0.00 0.0
1916 76 37 0.00 0.0
1915 92 50 0.00 0.0
1914 91 49 0.00 0.0
1913 92 48 0.00 0.0
1912 85 44 0.00 0.0
1911 82 50 0.00 0.0
What's the all-time high for Boise on 8/20?
For the date of Aug 20, the highest temperature ever reached in Boise history is 103 °F which happened in 1967.
Highest Temperatures in Boise on August 20
Rank Temperature Year
1 103 °F 1967
2 100 °F 1997
3 99 °F 1949
3 99 °F 2009
5 98 °F 1999
5 98 °F 2005
5 98 °F 2019
5 98 °F 1995
5 98 °F 1940
10 96 °F 2022
10 96 °F 1925
10 96 °F 1946
10 96 °F 1992
10 96 °F 1991
10 96 °F 2013
10 96 °F 1977
What's the all-time low for Boise on 8/20?
For the date of Aug 20, the lowest temperature ever reached in Boise history is 35 °F which happened in 1918.
Lowest Temperatures in Boise on August 20
Rank Temperature Year
1 35 °F 1918
2 37 °F 1916
3 43 °F 1928
3 43 °F 1935
5 44 °F 1912
5 44 °F 1920
5 44 °F 1924
8 45 °F 1929
9 46 °F 1921
9 46 °F 1984
Lowest High Temperatures in Boise on August 20
Rank Temperature Year
1 65 °F 1968
2 67 °F 1918
3 69 °F 1954
4 70 °F 1959
5 73 °F 1974
6 74 °F 1924
6 74 °F 1990
8 75 °F 1975
9 76 °F 1916
9 76 °F 1933
9 76 °F 1964
What's the most it has ever rained in Boise on 8/20?
For the date of Aug 20, the most precipitation ever recorded in Boise history is 0.40 inches which happened in 1959.
All-Time Most Precipitation in Boise on August 20
Rank Precipitation Year
1 0.40 inches 1959
2 0.14 inches 1990
3 0.13 inches 1954
4 0.09 inches 1958
5 0.06 inches 1974
6 0.05 inches 1968
7 0.04 inches 1965
8 0.02 inches 1982
8 0.02 inches 2023
10 0.01 inches 1981
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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