Boise May 18 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of May 18.
May 18 All-Time Records
1911–2023
Highest temperature 95 °F 2009
Lowest temperature 30 °F 1971
Lowest daily high 53 °F 1991
Highest daily low 62 °F 2006
Most precipitation 0.8 inches 1957
Most snow none -
May 18 Average Weather
1991–2020 1
Average high 73.0 °F
Average low 47.7 °F
Chance precipitation 28.0%
Chance snow 0%
Boise May 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 84 57 0.00 0.0
2022 76 46 0.00 0.0
2021 73 54 0.00 0.0
2020 60 51 0.15 0.0
2019 67 46 0.00 0.0
2018 75 54 0.00 0.0
2017 64 39 0.00 0.0
2016 82 52 0.00 0.0
2015 71 51 0.00 0.0
2014 69 50 0.04 0.0
2013 69 45 0.00 0.0
2012 69 45 0.00 0.0
2011 58 47 0.11 0.0
2010 62 52 0.25 0.0
2009 95 59 0.00 0.0
2008 92 61 0.00 0.0
2007 87 53 0.00 0.0
2006 92 62 0.01 0.0
2005 70 51 0.06 0.0
2004 61 50 0.27 0.0
2003 56 33 0.00 0.0
2002 87 52 0.00 0.0
2001 70 48 0.00 0.0
2000 73 45 0.00 0.0
1999 75 45 0.00 0.0
1998 63 37 0.00 0.0
1997 75 49 0.00 0.0
1996 62 47 0.25 0.0
1995 69 43 0.00 0.0
1994 64 34 0.09 0.0
1993 86 57 0.00 0.0
1992 88 57 0.00 0.0
1991 53 37 0.08 0.0
1990 68 44 0.00 0.0
1989 61 34 0.17 0.0
1988 66 38 0.00 0.0
1987 73 52 0.00 0.0
1986 85 57 0.00 0.0
1985 81 48 0.00 0.0
1984 73 41 0.00 0.0
1983 64 49 0.00 0.0
1982 59 43 0.01 0.0
1981 65 52 0.03 0.0
1980 77 48 0.00 0.0
1979 73 40 0.00 0.0
1978 65 48 0.01 0.0
1977 57 43 0.01 0.0
1976 75 41 0.00 0.0
1975 78 48 0.00 0.0
1974 57 36 0.00 0.0
1973 87 57 0.00 0.0
1972 68 41 0.00 0.0
1971 64 30 0.00 0.0
1970 81 51 0.00 0.0
1969 80 55 0.00 0.0
1968 83 52 0.00 0.0
1967 79 44 0.00 0.0
1966 72 34 0.00 0.0
1965 72 35 0.00 0.0
1964 84 50 0.00 0.0
1963 84 50 0.00 0.0
1962 62 48 0.27 0.0
1961 74 36 0.00 0.0
1960 57 34 0.16 0.0
1959 56 39 0.00 0.0
1958 90 54 0.00 0.0
1957 69 49 0.75 0.0
1956 84 60 0.06 0.0
1955 69 40 0.00 0.0
1954 93 55 0.00 0.0
1953 73 46 0.23 0.0
1952 77 46 0.00 0.0
1951 70 44 0.00 0.0
1950 56 36 0.00 0.0
1949 69 51 0.02 0.0
1948 68 41 0.27 0.0
1947 71 43 0.00 0.0
1946 78 45 0.00 0.0
1945 58 36 0.00 0.0
1944 60 47 0.00 0.0
1943 69 37 0.00 0.0
1942 71 46 0.00 0.0
1941 56 38 0.00 0.0
1940 76 39 0.00 0.0
1939 81 50 0.00 0.0
1938 56 34 0.46 0.0
1937 72 47 0.00 0.0
1936 89 42 0.00 0.0
1935 67 38 0.00 0.0
1934 78 43 0.00 n/a
1933 61 40 0.04 0.0
1932 84 55 0.00 n/a
1931 64 33 n/a n/a
1930 75 44 0.15 n/a
1929 80 34 0.00 0.0
1928 83 46 0.00 n/a
1927 67 41 0.00 0.0
1926 77 46 0.00 0.0
1925 85 51 0.00 0.0
1924 84 45 0.00 0.0
1923 71 48 0.43 0.0
1922 78 46 0.07 0.0
1921 64 42 0.32 0.0
1920 n/a 38 0.00 0.0
1919 89 52 0.00 0.0
1918 65 43 0.00 0.0
1917 64 38 0.06 0.0
1916 68 50 0.68 0.0
1915 53 48 0.22 0.0
1914 81 48 0.00 0.0
1913 61 46 0.55 0.0
1912 82 49 0.00 0.0
1911 57 43 0.04 0.0
What's the all-time high for Boise on 5/18?
For the date of May 18, the highest temperature ever reached in Boise history is 95 °F which happened in 2009.
Highest Temperatures in Boise on May 18
Rank Temperature Year
1 95 °F 2009
2 93 °F 1954
3 92 °F 2006
3 92 °F 2008
5 90 °F 1958
6 89 °F 1919
6 89 °F 1936
8 88 °F 1992
9 87 °F 2002
9 87 °F 2007
9 87 °F 1973
What's the all-time low for Boise on 5/18?
For the date of May 18, the lowest temperature ever reached in Boise history is 30 °F which happened in 1971.
Lowest Temperatures in Boise on May 18
Rank Temperature Year
1 30 °F 1971
2 33 °F 1931
2 33 °F 2003
4 34 °F 1966
4 34 °F 1929
4 34 °F 1994
4 34 °F 1989
4 34 °F 1938
4 34 °F 1960
10 35 °F 1965
Lowest High Temperatures in Boise on May 18
Rank Temperature Year
1 53 °F 1991
1 53 °F 1915
3 56 °F 1950
3 56 °F 2003
3 56 °F 1959
3 56 °F 1938
3 56 °F 1941
8 57 °F 1977
8 57 °F 1960
8 57 °F 1974
8 57 °F 1911
What's the most it has ever rained in Boise on 5/18?
For the date of May 18, the most precipitation ever recorded in Boise history is 0.75 inches which happened in 1957.
All-Time Most Precipitation in Boise on May 18
Rank Precipitation Year
1 0.75 inches 1957
2 0.68 inches 1916
3 0.55 inches 1913
4 0.46 inches 1938
5 0.43 inches 1923
6 0.32 inches 1921
7 0.27 inches 2004
7 0.27 inches 1962
7 0.27 inches 1948
10 0.25 inches 1996
10 0.25 inches 2010
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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