Boston September 21 Weather Records

Daily averages and all-time records for weather in Boston, Massachusetts for the date of September 21.
September 21 All-Time Records
1893–2024
Highest temperature 94 °F 1895
Lowest temperature 40 °F 1929
Lowest daily high 55 °F 1977
Highest daily low 69 °F 2016
Most precipitation 2.77 inches 1961
Most snow none -
September 21 Average Weather
1991–2020 1
Average high 71.5 °F
Average low 56.5 °F
Chance precipitation 31.3%
Chance snow 0%
Boston September 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 69 57 0.00 0.0
2022 69 57 0.00 0.0
2021 73 57 0.00 0.0
2020 61 45 0.00 0.0
2019 83 65 0.00 0.0
2018 73 61 0.00 0.0
2017 72 63 0.00 0.0
2016 83 69 0.00 0.0
2015 66 53 0.00 0.0
2014 82 63 0.01 0.0
2013 77 57 0.00 0.0
2012 63 51 0.00 0.0
2011 75 59 0.00 0.0
2010 72 51 0.00 0.0
2009 70 51 0.00 0.0
2008 75 52 0.31 0.0
2007 71 59 0.00 0.0
2006 66 53 0.00 0.0
2005 79 64 0.00 0.0
2004 69 59 0.00 0.0
2003 72 61 0.00 0.0
2002 83 65 0.00 0.0
2001 69 62 0.35 0.0
2000 78 60 0.01 0.0
1999 70 59 0.01 0.0
1998 80 63 0.00 0.0
1997 62 49 0.00 0.0
1996 77 58 0.00 0.0
1995 66 52 0.00 0.0
1994 78 58 0.00 0.0
1993 60 50 0.07 0.0
1992 76 53 0.00 0.0
1991 62 45 0.00 0.0
1990 65 52 0.00 0.0
1989 76 66 0.26 0.0
1988 79 65 0.28 0.0
1987 65 57 0.01 0.0
1986 57 50 0.13 0.0
1985 86 66 0.00 0.0
1984 71 55 0.00 0.0
1983 85 69 0.00 0.0
1982 60 52 0.00 0.0
1981 68 53 0.00 0.0
1980 85 67 0.00 0.0
1979 69 53 0.80 0.0
1978 88 59 0.00 0.0
1977 55 48 0.01 0.0
1976 75 60 0.04 0.0
1975 80 64 0.08 0.0
1974 72 64 1.93 0.0
1973 61 43 0.00 0.0
1972 63 50 0.03 0.0
1971 76 58 0.11 0.0
1970 81 59 0.00 0.0
1969 62 46 0.00 0.0
1968 67 56 0.00 0.0
1967 75 53 0.00 0.0
1966 62 55 0.30 0.0
1965 88 68 0.00 0.0
1964 62 46 0.00 0.0
1963 59 53 0.05 0.0
1962 59 41 0.00 0.0
1961 65 58 2.77 0.0
1960 65 56 0.00 0.0
1959 80 55 0.00 0.0
1958 68 57 0.22 0.0
1957 80 67 0.00 0.0
1956 62 41 0.00 0.0
1955 67 51 0.00 0.0
1954 65 55 0.12 0.0
1953 70 59 0.97 0.0
1952 74 55 0.00 0.0
1951 78 58 0.00 0.0
1950 74 53 0.00 0.0
1949 70 51 0.00 0.0
1948 67 50 0.00 0.0
1947 71 49 0.00 0.0
1946 77 62 0.00 0.0
1945 80 56 0.00 0.0
1944 76 65 0.08 0.0
1943 78 58 0.00 0.0
1942 56 51 0.01 0.0
1941 82 52 0.00 0.0
1940 86 66 0.15 0.0
1939 65 53 0.10 0.0
1938 75 60 0.10 0.0
1937 68 45 0.00 0.0
1936 65 57 0.10 0.0
1935 71 55 0.00 0.0
1934 69 60 0.00 0.0
1933 68 57 0.05 0.0
1932 74 58 0.00 0.0
1931 62 55 0.00 0.0
1930 84 64 0.00 0.0
1929 58 40 0.00 0.0
1928 78 64 0.00 0.0
1927 71 58 0.00 0.0
1926 67 56 0.00 0.0
1925 82 57 0.01 0.0
1924 63 51 0.00 0.0
1923 79 58 0.02 0.0
1922 65 54 0.00 0.0
1921 68 55 0.17 0.0
1920 64 51 0.00 0.0
1919 80 64 0.00 0.0
1918 60 49 0.36 0.0
1917 74 57 0.00 0.0
1916 75 57 0.00 0.0
1915 71 57 0.59 0.0
1914 90 64 0.00 0.0
1913 65 58 0.08 0.0
1912 56 47 0.00 0.0
1911 63 56 0.00 0.0
1910 78 59 0.14 0.0
1909 64 52 0.00 0.0
1908 72 52 0.00 0.0
1907 86 68 0.07 0.0
1906 74 65 0.66 0.0
1905 76 58 0.00 0.0
1904 60 40 0.00 0.0
1903 62 51 0.00 0.0
1902 62 58 0.00 0.0
1901 68 45 0.00 0.0
1900 74 59 0.00 0.0
1899 73 54 0.21 0.0
1898 66 44 0.00 0.0
1897 62 47 0.00 0.0
1896 70 48 0.00 0.0
1895 94 60 0.00 0.0
1894 80 61 0.00 0.0
1893 65 47 0.00 0.0
What's the all-time high for Boston on 9/21?
For the date of Sep 21, the highest temperature ever reached in Boston history is 94 °F which happened in 1895.
Highest Temperatures in Boston on September 21
Rank Temperature Year
1 94 °F 1895
2 90 °F 1914
3 88 °F 1965
3 88 °F 1978
5 86 °F 1907
5 86 °F 1985
5 86 °F 1940
8 85 °F 1983
8 85 °F 1980
10 84 °F 1930
What's the all-time low for Boston on 9/21?
For the date of Sep 21, the lowest temperature ever reached in Boston history is 40 °F which has happened 2 times, most recently in 1929.
Lowest Temperatures in Boston on September 21
Rank Temperature Year
1 40 °F 1929
1 40 °F 1904
3 41 °F 1956
3 41 °F 1962
5 43 °F 1973
6 44 °F 1898
7 45 °F 1937
7 45 °F 2020
7 45 °F 1991
7 45 °F 1901
Lowest High Temperatures in Boston on September 21
Rank Temperature Year
1 55 °F 1977
2 56 °F 1942
2 56 °F 1912
4 57 °F 1986
5 58 °F 1929
6 59 °F 1963
6 59 °F 1962
8 60 °F 1904
8 60 °F 1993
8 60 °F 1918
8 60 °F 1982
What's the most it has ever rained in Boston on 9/21?
For the date of Sep 21, the most precipitation ever recorded in Boston history is 2.77 inches which happened in 1961.
All-Time Most Precipitation in Boston on September 21
Rank Precipitation Year
1 2.77 inches 1961
2 1.93 inches 1974
3 0.97 inches 1953
4 0.80 inches 1979
5 0.66 inches 1906
6 0.59 inches 1915
7 0.36 inches 1918
8 0.35 inches 2001
9 0.31 inches 2008
10 0.30 inches 1966
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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