Boise August 21 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of August 21.
August 21 All-Time Records
1911–2024
Highest temperature 101 °F 2005
Lowest temperature 38 °F 1916
Lowest daily high 67 °F 1968
Highest daily low 72 °F 2012
Most precipitation 0.37 inches 2023
Most snow none -
August 21 Average Weather
1991–2020 1
Average high 89.4 °F
Average low 59.4 °F
Chance precipitation 7.4%
Chance snow 0%
Boise August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 87 66 0.37 0.0
2022 100 69 0.00 0.0
2021 77 57 0.05 0.0
2020 92 66 0.00 0.0
2019 97 66 0.00 0.0
2018 81 55 0.00 0.0
2017 88 56 0.00 0.0
2016 95 63 0.00 0.0
2015 88 59 0.00 0.0
2014 83 58 0.00 0.0
2013 92 62 0.00 0.0
2012 94 72 0.00 0.0
2011 99 63 0.00 0.0
2010 94 63 0.00 0.0
2009 97 67 0.00 0.0
2008 83 61 0.00 0.0
2007 80 55 0.00 0.0
2006 100 65 0.00 0.0
2005 101 66 0.00 0.0
2004 94 67 0.01 0.0
2003 89 66 0.01 0.0
2002 75 54 0.00 0.0
2001 89 55 0.00 0.0
2000 83 49 0.00 0.0
1999 90 66 0.00 0.0
1998 90 58 0.00 0.0
1997 93 60 0.00 0.0
1996 82 50 0.00 0.0
1995 97 61 0.00 0.0
1994 89 54 0.00 0.0
1993 81 55 0.00 0.0
1992 96 62 0.00 0.0
1991 98 65 0.00 0.0
1990 80 53 0.01 0.0
1989 83 59 0.00 0.0
1988 81 44 0.00 0.0
1987 89 53 0.00 0.0
1986 84 62 0.03 0.0
1985 78 49 0.00 0.0
1984 90 52 0.00 0.0
1983 78 58 0.00 0.0
1982 94 58 0.00 0.0
1981 88 48 0.00 0.0
1980 88 50 0.00 0.0
1979 81 59 0.03 0.0
1978 87 47 0.00 0.0
1977 91 67 0.00 0.0
1976 96 55 0.00 0.0
1975 79 53 0.00 0.0
1974 87 53 0.00 0.0
1973 92 63 0.00 0.0
1972 89 56 0.00 0.0
1971 92 61 0.00 0.0
1970 93 56 0.00 0.0
1969 99 64 0.00 0.0
1968 67 46 0.00 0.0
1967 89 63 0.00 0.0
1966 86 50 0.00 0.0
1965 78 55 0.00 0.0
1964 82 47 0.00 0.0
1963 81 51 0.00 0.0
1962 89 63 0.00 0.0
1961 96 65 0.00 0.0
1960 97 56 0.00 0.0
1959 71 47 0.00 0.0
1958 90 63 0.00 0.0
1957 89 54 0.00 0.0
1956 93 62 0.00 0.0
1955 95 53 0.00 0.0
1954 70 50 0.03 0.0
1953 84 52 0.00 0.0
1952 92 58 0.00 0.0
1951 93 65 0.00 0.0
1950 94 58 0.00 0.0
1949 83 52 0.00 0.0
1948 89 53 0.00 0.0
1947 78 51 0.00 0.0
1946 96 67 0.00 0.0
1945 95 56 0.00 0.0
1944 90 53 0.00 0.0
1943 85 53 0.00 0.0
1942 88 58 0.00 0.0
1941 85 59 0.00 0.0
1940 90 56 0.00 0.0
1939 92 50 0.00 0.0
1938 n/a n/a 0.00 0.0
1937 95 53 0.00 0.0
1936 94 47 0.00 0.0
1935 97 51 0.00 0.0
1934 91 50 0.00 n/a
1933 75 42 0.00 0.0
1932 86 67 0.00 n/a
1931 91 53 0.00 n/a
1930 93 45 0.00 n/a
1929 93 45 0.00 n/a
1928 92 46 0.00 n/a
1927 88 49 0.00 n/a
1926 87 44 0.00 0.0
1925 94 57 0.00 0.0
1924 82 41 0.00 0.0
1923 93 54 0.00 0.0
1922 85 50 0.00 0.0
1921 86 51 0.00 0.0
1920 94 45 0.00 0.0
1919 95 52 0.00 0.0
1918 73 39 0.00 0.0
1917 92 53 0.00 0.0
1916 82 38 0.00 0.0
1915 91 56 0.00 0.0
1914 90 47 0.00 0.0
1913 96 50 0.00 0.0
1912 91 48 0.00 0.0
1911 81 42 0.00 0.0
What's the all-time high for Boise on 8/21?
For the date of Aug 21, the highest temperature ever reached in Boise history is 101 °F which happened in 2005.
Highest Temperatures in Boise on August 21
Rank Temperature Year
1 101 °F 2005
2 100 °F 2006
2 100 °F 2022
4 99 °F 2011
4 99 °F 1969
6 98 °F 1991
7 97 °F 2019
7 97 °F 2009
7 97 °F 1960
7 97 °F 1995
7 97 °F 1935
What's the all-time low for Boise on 8/21?
For the date of Aug 21, the lowest temperature ever reached in Boise history is 38 °F which happened in 1916.
Lowest Temperatures in Boise on August 21
Rank Temperature Year
1 38 °F 1916
2 39 °F 1918
3 41 °F 1924
4 42 °F 1933
4 42 °F 1911
6 44 °F 1926
6 44 °F 1988
8 45 °F 1929
8 45 °F 1920
8 45 °F 1930
Lowest High Temperatures in Boise on August 21
Rank Temperature Year
1 67 °F 1968
2 70 °F 1954
3 71 °F 1959
4 73 °F 1918
5 75 °F 1933
5 75 °F 2002
7 77 °F 2021
8 78 °F 1947
8 78 °F 1965
8 78 °F 1983
8 78 °F 1985
What's the most it has ever rained in Boise on 8/21?
For the date of Aug 21, the most precipitation ever recorded in Boise history is 0.37 inches which happened in 2023.
All-Time Most Precipitation in Boise on August 21
Rank Precipitation Year
1 0.37 inches 2023
2 0.05 inches 2021
3 0.03 inches 1979
3 0.03 inches 1986
3 0.03 inches 1954
6 0.01 inches 2003
6 0.01 inches 1990
6 0.01 inches 2004
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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