Weather on April 21
Boston, MA
55 Years of Data
Avg High
60°F
Avg Low
43°F
Warmest
1977
68°F avg
Coldest
1981
39°F avg
About This Date
April 21st in Boston, MA typically brings mild spring weather, with average highs around 60°F and lows near 43°F. Over 55 years of records, the warmest April 21st was in 1977 (68°F average), while the coldest was 1981 (39°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 29% of April 21st dates historically, with the wettest April 21st recording 8.43" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for April 21st in Boston, MA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 56° | 43° | 49° | — | — |
| 2024 | 52° | 41° | 46° | — | — |
| 2023 | 51° | 45° | 48° | — | — |
| 2022 | 62° | 41° | 52° | — | — |
| 2021 | 72° | 38° | 55° | 0.61" | — |
| 2020 | 54° | 34° | 44° | 0.84" | — |
| 2019 | 70° | 55° | 62° | 0.08" | — |
| 2018 | 59° | 39° | 49° | — | — |
| 2017 | 45° | 44° | 44° | 1.3" | — |
| 2016 | 77° | 43° | 60° | — | — |
| 2015 | 65° | 46° | 55° | 1.37" | — |
| 2014 | 69° | 36° | 52° | — | — |
| 2013 | 50° | 37° | 44° | — | — |
| 2012 | 78° | 54° | 66° | 0.03" | — |
| 2011 | 56° | 41° | 48° | — | — |
| 2010 | 69° | 47° | 58° | — | — |
| 2009 | 58° | 43° | 50° | 2.87" | — |
| 2008 | 52° | 44° | 48° | — | — |
| 2007 | 75° | 44° | 60° | — | — |
| 2006 | 49° | 43° | 46° | — | — |
| 2005 | 54° | 41° | 47° | 0.18" | — |
| 2004 | 61° | 43° | 52° | — | — |
| 2003 | 54° | 40° | 47° | 0.2" | — |
| 2002 | 56° | 43° | 49° | — | — |
| 2001 | 67° | 47° | 57° | — | — |
| 2000 | 47° | 42° | 44° | 2.59" | — |
| 1999 | 61° | 42° | 51° | — | — |
| 1998 | 65° | 41° | 53° | — | — |
| 1997 | 52° | 42° | 47° | — | — |
| 1996 | 79° | 56° | 67° | — | — |
| 1995 | 49° | 43° | 46° | 0.36" | — |
| 1994 | 55° | 41° | 48° | — | — |
| 1993 | 70° | 53° | 61° | — | — |
| 1992 | 75° | 54° | 64° | — | — |
| 1991 | 51° | 41° | 46° | 8.43" | — |
| 1990 | 56° | 47° | 51° | 1.22" | — |
| 1989 | 53° | 41° | 47° | — | — |
| 1988 | 57° | 38° | 47° | — | — |
| 1987 | 57° | 44° | 51° | 0.08" | — |
| 1986 | 65° | 46° | 55° | 0.38" | — |
| 1985 | 60° | 48° | 54° | — | — |
| 1984 | 54° | 34° | 44° | — | — |
| 1983 | 50° | 39° | 45° | — | — |
| 1982 | 61° | 40° | 50° | 0.03" | — |
| 1981coldest | 47° | 32° | 39° | — | — |
| 1980 | 71° | 43° | 57° | — | — |
| 1979 | 54° | 39° | 46° | — | — |
| 1978 | 56° | 48° | 52° | — | — |
| 1977warmest | 82° | 53° | 68° | — | — |
| 1976 | 68° | 49° | 58° | — | — |
| 1975 | 52° | 37° | 44° | — | — |
| 1974 | 77° | 41° | 59° | — | — |
| 1973 | 66° | 41° | 54° | — | — |
| 1972 | 54° | 38° | 46° | — | — |
| 1971 | 65° | 44° | 54° | — | — |
55 years of data from BOSTON