Boston August 21 Weather Records

Daily averages and all-time records for weather in Boston, Massachusetts for the date of August 21.
August 21 All-Time Records
1893–2024
Highest temperature 97 °F 1955
Lowest temperature 53 °F 1897
Lowest daily high 63 °F 1893
Highest daily low 76 °F 1955
Most precipitation 1.72 inches 1991
Most snow none -
August 21 Average Weather
1991–2020 1
Average high 79.8 °F
Average low 64.5 °F
Chance precipitation 28.7%
Chance snow 0%
Boston August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 86 68 0.28 0.0
2022 89 68 0.00 0.0
2021 83 72 0.00 0.0
2020 89 63 0.00 0.0
2019 88 69 0.08 0.0
2018 72 65 0.00 0.0
2017 87 69 0.00 0.0
2016 78 65 0.01 0.0
2015 83 67 0.63 0.0
2014 72 60 0.00 0.0
2013 89 67 0.00 0.0
2012 83 66 0.00 0.0
2011 86 69 0.00 0.0
2010 73 62 0.00 0.0
2009 90 72 0.00 0.0
2008 78 59 0.00 0.0
2007 67 55 0.00 0.0
2006 77 62 0.00 0.0
2005 88 69 0.02 0.0
2004 79 63 1.05 0.0
2003 90 73 0.00 0.0
2002 76 65 0.00 0.0
2001 72 64 0.00 0.0
2000 75 56 0.00 0.0
1999 66 59 0.12 0.0
1998 76 64 0.00 0.0
1997 64 60 0.85 0.0
1996 84 65 0.00 0.0
1995 94 59 0.00 0.0
1994 85 66 0.78 0.0
1993 75 62 0.00 0.0
1992 80 57 0.00 0.0
1991 66 58 1.72 0.0
1990 69 61 0.00 0.0
1989 87 70 0.35 0.0
1988 81 59 0.00 0.0
1987 84 64 0.00 0.0
1986 70 60 0.04 0.0
1985 78 63 0.01 0.0
1984 77 56 0.00 0.0
1983 85 67 0.00 0.0
1982 70 54 0.00 0.0
1981 76 56 0.00 0.0
1980 67 59 0.00 0.0
1979 71 62 0.00 0.0
1978 72 63 0.00 0.0
1977 69 56 0.00 0.0
1976 93 71 0.00 0.0
1975 82 60 0.02 0.0
1974 77 62 0.00 0.0
1973 72 62 0.00 0.0
1972 85 63 0.00 0.0
1971 87 71 0.00 0.0
1970 84 68 0.01 0.0
1969 76 58 0.00 0.0
1968 87 71 0.00 0.0
1967 80 66 0.00 0.0
1966 76 61 0.00 0.0
1965 69 59 0.00 0.0
1964 75 54 0.00 0.0
1963 87 64 0.00 0.0
1962 86 67 0.01 0.0
1961 70 61 0.73 0.0
1960 87 68 0.00 0.0
1959 95 65 0.31 0.0
1958 87 66 0.01 0.0
1957 68 62 0.00 0.0
1956 66 59 0.58 0.0
1955 97 76 0.00 0.0
1954 73 61 0.00 0.0
1953 71 59 0.00 0.0
1952 75 63 0.03 0.0
1951 76 62 0.01 0.0
1950 80 61 0.00 0.0
1949 84 57 0.00 0.0
1948 81 64 0.00 0.0
1947 72 64 0.00 0.0
1946 80 62 0.00 0.0
1945 92 69 0.00 0.0
1944 84 62 0.00 0.0
1943 82 63 0.00 0.0
1942 92 71 0.00 0.0
1941 71 57 0.00 0.0
1940 68 54 0.00 0.0
1939 85 70 0.00 0.0
1938 86 67 0.00 0.0
1937 95 72 0.32 0.0
1936 71 56 0.25 0.0
1935 84 68 0.00 0.0
1934 74 55 0.00 0.0
1933 70 63 0.44 0.0
1932 76 63 0.00 0.0
1931 74 60 0.00 0.0
1930 68 56 0.00 0.0
1929 78 54 0.00 0.0
1928 74 62 0.00 0.0
1927 67 58 0.00 0.0
1926 67 56 0.00 0.0
1925 69 55 0.00 0.0
1924 73 62 0.00 0.0
1923 79 58 0.00 0.0
1922 75 54 0.00 0.0
1921 73 61 0.00 0.0
1920 73 56 0.00 0.0
1919 83 62 0.00 0.0
1918 86 60 0.00 0.0
1917 82 64 0.04 0.0
1916 91 66 0.00 0.0
1915 80 65 0.00 0.0
1914 68 61 0.63 0.0
1913 70 58 0.00 0.0
1912 73 62 0.00 0.0
1911 81 57 0.00 0.0
1910 78 58 0.00 0.0
1909 74 60 0.00 0.0
1908 77 56 0.00 0.0
1907 76 62 0.06 0.0
1906 82 73 0.15 0.0
1905 75 62 0.00 0.0
1904 78 65 0.01 0.0
1903 79 62 0.00 0.0
1902 72 61 0.01 0.0
1901 71 64 0.00 0.0
1900 72 59 0.00 0.0
1899 73 63 0.00 0.0
1898 84 60 0.00 0.0
1897 77 53 0.00 0.0
1896 76 57 0.00 0.0
1895 73 57 0.00 0.0
1894 67 55 0.00 0.0
1893 63 58 1.65 0.0
What's the all-time high for Boston on 8/21?
For the date of Aug 21, the highest temperature ever reached in Boston history is 97 °F which happened in 1955.
Highest Temperatures in Boston on August 21
Rank Temperature Year
1 97 °F 1955
2 95 °F 1959
2 95 °F 1937
4 94 °F 1995
5 93 °F 1976
6 92 °F 1945
6 92 °F 1942
8 91 °F 1916
9 90 °F 2003
9 90 °F 2009
What's the all-time low for Boston on 8/21?
For the date of Aug 21, the lowest temperature ever reached in Boston history is 53 °F which happened in 1897.
Lowest Temperatures in Boston on August 21
Rank Temperature Year
1 53 °F 1897
2 54 °F 1940
2 54 °F 1929
2 54 °F 1922
2 54 °F 1964
2 54 °F 1982
7 55 °F 1934
7 55 °F 1894
7 55 °F 1925
7 55 °F 2007
Lowest High Temperatures in Boston on August 21
Rank Temperature Year
1 63 °F 1893
2 64 °F 1997
3 66 °F 1991
3 66 °F 1956
3 66 °F 1999
6 67 °F 1926
6 67 °F 1894
6 67 °F 2007
6 67 °F 1927
6 67 °F 1980
What's the most it has ever rained in Boston on 8/21?
For the date of Aug 21, the most precipitation ever recorded in Boston history is 1.72 inches which happened in 1991.
All-Time Most Precipitation in Boston on August 21
Rank Precipitation Year
1 1.72 inches 1991
2 1.65 inches 1893
3 1.05 inches 2004
4 0.85 inches 1997
5 0.78 inches 1994
6 0.73 inches 1961
7 0.63 inches 2015
7 0.63 inches 1914
9 0.58 inches 1956
10 0.44 inches 1933
Weather Station Details
Years Station Coordinates
1936–2024 Boston Logan International Airport location
1893–1935 Boston City location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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