Boise August 18 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of August 18.
August 18 All-Time Records
1911–2024
Highest temperature 103 °F 2008
Lowest temperature 38 °F 1995
Lowest daily high 64 °F 1975
Highest daily low 74 °F 1977
Most precipitation 0.24 inches 1926
Most snow none -
August 18 Average Weather
1991–2020 1
Average high 90.2 °F
Average low 60.1 °F
Chance precipitation 6.9%
Chance snow 0%
Boise August 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 96 72 0.00 0.0
2022 99 71 0.00 0.0
2021 77 53 0.00 0.0
2020 101 73 0.00 0.0
2019 94 59 0.00 0.0
2018 91 60 0.00 0.0
2017 92 59 0.00 0.0
2016 96 69 0.00 0.0
2015 87 56 0.00 0.0
2014 95 62 0.00 0.0
2013 97 62 0.00 0.0
2012 97 60 0.00 0.0
2011 92 59 0.00 0.0
2010 91 65 0.00 0.0
2009 85 56 0.00 0.0
2008 103 70 0.00 0.0
2007 91 61 0.00 0.0
2006 85 54 0.00 0.0
2005 84 62 0.00 0.0
2004 88 62 0.00 0.0
2003 93 63 0.00 0.0
2002 83 57 0.00 0.0
2001 94 62 0.00 0.0
2000 90 59 0.00 0.0
1999 96 60 0.00 0.0
1998 83 51 0.00 0.0
1997 88 58 0.00 0.0
1996 75 55 0.00 0.0
1995 75 38 0.00 0.0
1994 94 53 0.00 0.0
1993 82 50 0.00 0.0
1992 102 66 0.00 0.0
1991 98 65 0.00 0.0
1990 68 56 0.03 0.0
1989 86 56 0.00 0.0
1988 82 55 0.00 0.0
1987 87 47 0.00 0.0
1986 100 62 0.00 0.0
1985 90 56 0.03 0.0
1984 95 66 0.00 0.0
1983 91 62 0.00 0.0
1982 86 57 0.00 0.0
1981 95 66 0.00 0.0
1980 73 53 0.00 0.0
1979 82 62 0.00 0.0
1978 77 42 0.00 0.0
1977 96 74 0.00 0.0
1976 71 51 0.01 0.0
1975 64 57 0.05 0.0
1974 92 60 0.00 0.0
1973 88 50 0.00 0.0
1972 93 49 0.00 0.0
1971 94 53 0.00 0.0
1970 90 48 0.00 0.0
1969 89 65 0.00 0.0
1968 66 52 0.18 0.0
1967 99 69 0.00 0.0
1966 92 59 0.00 0.0
1965 86 61 0.04 0.0
1964 87 58 0.00 0.0
1963 90 62 0.00 0.0
1962 85 53 0.00 0.0
1961 98 63 0.00 0.0
1960 91 61 0.00 0.0
1959 84 53 0.00 0.0
1958 83 64 0.00 0.0
1957 93 57 0.00 0.0
1956 89 54 0.00 0.0
1955 94 59 0.00 0.0
1954 86 52 0.00 0.0
1953 96 63 0.00 0.0
1952 90 56 0.00 0.0
1951 91 58 0.00 0.0
1950 97 62 0.00 0.0
1949 89 58 0.00 0.0
1948 89 53 0.00 0.0
1947 95 61 0.00 0.0
1946 93 53 0.00 0.0
1945 91 68 0.00 0.0
1944 86 57 0.00 0.0
1943 88 58 0.00 0.0
1942 98 64 0.00 0.0
1941 78 60 0.03 0.0
1940 96 58 0.00 0.0
1939 87 53 0.00 0.0
1938 82 51 0.00 0.0
1937 91 55 0.00 0.0
1936 86 51 0.00 0.0
1935 79 43 0.00 0.0
1934 86 55 0.00 n/a
1933 81 66 0.00 0.0
1932 94 50 0.00 n/a
1931 92 61 0.00 n/a
1930 90 55 0.05 n/a
1929 93 63 0.00 n/a
1928 94 48 0.00 n/a
1927 90 53 0.00 n/a
1926 75 58 0.24 0.0
1925 91 53 0.00 0.0
1924 83 50 0.00 0.0
1923 96 57 0.00 0.0
1922 90 57 0.00 0.0
1921 80 53 0.00 0.0
1920 72 46 0.00 0.0
1919 98 64 0.00 0.0
1918 78 42 0.00 0.0
1917 94 52 0.00 0.0
1916 64 42 0.00 0.0
1915 94 59 0.00 0.0
1914 81 38 0.00 0.0
1913 79 49 0.00 0.0
1912 64 45 0.00 0.0
1911 95 46 0.00 0.0
What's the all-time high for Boise on 8/18?
For the date of Aug 18, the highest temperature ever reached in Boise history is 103 °F which happened in 2008.
Highest Temperatures in Boise on August 18
Rank Temperature Year
1 103 °F 2008
2 102 °F 1992
3 101 °F 2020
4 100 °F 1986
5 99 °F 2022
5 99 °F 1967
7 98 °F 1961
7 98 °F 1991
7 98 °F 1919
7 98 °F 1942
What's the all-time low for Boise on 8/18?
For the date of Aug 18, the lowest temperature ever reached in Boise history is 38 °F which has happened 2 times, most recently in 1995.
Lowest Temperatures in Boise on August 18
Rank Temperature Year
1 38 °F 1995
1 38 °F 1914
3 42 °F 1918
3 42 °F 1978
3 42 °F 1916
6 43 °F 1935
7 45 °F 1912
8 46 °F 1920
8 46 °F 1911
10 47 °F 1987
Lowest High Temperatures in Boise on August 18
Rank Temperature Year
1 64 °F 1916
1 64 °F 1975
1 64 °F 1912
4 66 °F 1968
5 68 °F 1990
6 71 °F 1976
7 72 °F 1920
8 73 °F 1980
9 75 °F 1995
9 75 °F 1926
9 75 °F 1996
What's the most it has ever rained in Boise on 8/18?
For the date of Aug 18, the most precipitation ever recorded in Boise history is 0.24 inches which happened in 1926.
All-Time Most Precipitation in Boise on August 18
Rank Precipitation Year
1 0.24 inches 1926
2 0.18 inches 1968
3 0.05 inches 1975
3 0.05 inches 1930
5 0.04 inches 1965
6 0.03 inches 1990
6 0.03 inches 1985
6 0.03 inches 1941
9 0.01 inches 1976
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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