Weather on October 21
Boston, MA
55 Years of Data
Avg High
63°F
Avg Low
47°F
Warmest
1979
69°F avg
Coldest
1974
36°F avg
About This Date
October 21st in Boston, MA typically brings mild fall weather, with average highs around 63°F and lows near 47°F. Over 55 years of records, the warmest October 21st was in 1979 (69°F average), while the coldest was 1974 (36°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 31% of October 21st dates historically, with the wettest October 21st recording 4.52" of rain. The last decade has been 6.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.8°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Boston, MA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 51° | 59° | — | — |
| 2024 | 83° | 52° | 67° | — | — |
| 2023 | 60° | 56° | 58° | 1.42" | — |
| 2022 | 62° | 46° | 54° | — | — |
| 2021 | 75° | 58° | 66° | — | — |
| 2020 | 65° | 56° | 60° | 0.15" | — |
| 2019 | 63° | 51° | 57° | — | — |
| 2018 | 53° | 37° | 45° | 0.08" | — |
| 2017 | 78° | 51° | 65° | — | — |
| 2016 | 75° | 59° | 67° | 2.82" | — |
| 2015 | 61° | 53° | 57° | 0.18" | — |
| 2014 | 62° | 49° | 55° | — | — |
| 2013 | 68° | 45° | 56° | — | — |
| 2012 | 64° | 49° | 56° | — | — |
| 2011 | 64° | 53° | 59° | — | — |
| 2010 | 60° | 45° | 52° | 0.05" | — |
| 2009 | 68° | 52° | 60° | — | — |
| 2008 | 59° | 44° | 52° | 0.03" | — |
| 2007 | 75° | 55° | 65° | — | — |
| 2006 | 56° | 42° | 49° | — | — |
| 2005 | 58° | 44° | 51° | — | — |
| 2004 | 51° | 43° | 47° | — | — |
| 2003 | 70° | 46° | 58° | 0.05" | — |
| 2002 | 54° | 38° | 46° | — | — |
| 2001 | 74° | 47° | 60° | — | — |
| 2000 | 74° | 50° | 62° | — | — |
| 1999 | 57° | 45° | 51° | — | — |
| 1998 | 57° | 45° | 51° | — | — |
| 1997 | 58° | 44° | 51° | — | — |
| 1996 | 57° | 49° | 53° | 4.52" | — |
| 1995 | 68° | 58° | 63° | 3.56" | — |
| 1994 | 66° | 56° | 61° | 0.03" | — |
| 1993 | 70° | 48° | 59° | 1.3" | — |
| 1992 | 50° | 45° | 47° | 0.25" | — |
| 1991 | 54° | 36° | 45° | — | — |
| 1990 | 63° | 40° | 51° | — | — |
| 1989 | 57° | 42° | 50° | 0.05" | — |
| 1988 | 52° | 35° | 43° | — | — |
| 1987 | 67° | 47° | 57° | 0.13" | — |
| 1986 | 68° | 45° | 56° | — | — |
| 1985 | 54° | 39° | 46° | — | — |
| 1984 | 70° | 49° | 59° | — | — |
| 1983 | 47° | 35° | 41° | — | — |
| 1982 | 68° | 45° | 56° | — | — |
| 1981 | 72° | 48° | 60° | — | — |
| 1980 | 57° | 41° | 49° | 0.03" | — |
| 1979warmest | 80° | 57° | 69° | — | — |
| 1978 | 70° | 41° | 55° | — | — |
| 1977 | 68° | 50° | 59° | — | — |
| 1976 | 67° | 47° | 57° | 0.79" | — |
| 1975 | 69° | 48° | 59° | — | — |
| 1974coldest | 42° | 30° | 36° | — | — |
| 1973 | 58° | 44° | 51° | — | — |
| 1972 | 49° | 33° | 41° | — | — |
| 1971 | 67° | 49° | 58° | — | — |
55 years of data from BOSTON