Weather on June 21
Boston, MA
55 Years of Data
Avg High
78°F
Avg Low
62°F
Warmest
2012
88°F avg
Coldest
1978
59°F avg
About This Date
June 21st in Boston, MA typically brings pleasant summer weather, with average highs around 78°F and lows near 62°F. Over 55 years of records, the warmest June 21st was in 2012 (88°F average), while the coldest was 1978 (59°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 27% of June 21st dates historically, with the wettest June 21st recording 4.37" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for June 21st in Boston, MA? Great weather for outdoor activities.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 66° | 73° | — | — |
| 2024 | 82° | 63° | 72° | 1.22" | — |
| 2023 | 66° | 57° | 62° | — | — |
| 2022 | 71° | 53° | 62° | — | — |
| 2021 | 87° | 69° | 78° | — | — |
| 2020 | 87° | 67° | 77° | — | — |
| 2019 | 76° | 61° | 68° | 3.02" | — |
| 2018 | 80° | 64° | 72° | — | — |
| 2017 | 84° | 67° | 75° | — | — |
| 2016 | 87° | 64° | 76° | 0.05" | — |
| 2015 | 76° | 60° | 68° | 4.37" | — |
| 2014 | 75° | 57° | 66° | — | — |
| 2013 | 84° | 61° | 72° | — | — |
| 2012warmest | 96° | 80° | 88° | — | — |
| 2011 | 76° | 65° | 70° | — | — |
| 2010 | 85° | 68° | 76° | — | — |
| 2009 | 64° | 60° | 62° | 0.1" | — |
| 2008 | 83° | 63° | 73° | — | — |
| 2007 | 81° | 62° | 71° | 0.23" | — |
| 2006 | 79° | 64° | 71° | — | — |
| 2005 | 84° | 57° | 71° | — | — |
| 2004 | 78° | 59° | 69° | — | — |
| 2003 | 66° | 58° | 62° | 0.53" | — |
| 2002 | 85° | 60° | 72° | — | — |
| 2001 | 71° | 61° | 66° | — | — |
| 2000 | 83° | 61° | 72° | — | — |
| 1999 | 74° | 59° | 66° | — | — |
| 1998 | 68° | 58° | 63° | — | — |
| 1997 | 92° | 68° | 80° | — | — |
| 1996 | 77° | 60° | 69° | 0.28" | — |
| 1995 | 69° | 61° | 65° | — | — |
| 1994 | 74° | 65° | 69° | 0.23" | — |
| 1993 | 85° | 61° | 73° | 0.2" | — |
| 1992 | 80° | 63° | 71° | 0.03" | — |
| 1991 | 88° | 70° | 79° | — | — |
| 1990 | 64° | 57° | 61° | 0.05" | — |
| 1989 | 78° | 62° | 70° | — | — |
| 1988 | 93° | 71° | 82° | — | — |
| 1987 | 66° | 58° | 62° | — | — |
| 1986 | 67° | 53° | 60° | — | — |
| 1985 | 78° | 58° | 68° | — | — |
| 1984 | 76° | 59° | 67° | — | — |
| 1983 | 81° | 65° | 73° | — | — |
| 1982 | 73° | 56° | 64° | 2.08" | — |
| 1981 | 79° | 67° | 73° | — | — |
| 1980 | 76° | 55° | 65° | — | — |
| 1979 | 70° | 56° | 63° | — | — |
| 1978coldest | 63° | 55° | 59° | — | — |
| 1977 | 81° | 63° | 72° | — | — |
| 1976 | 90° | 71° | 80° | — | — |
| 1975 | 81° | 60° | 70° | — | — |
| 1974 | 81° | 66° | 73° | 0.66" | — |
| 1973 | 87° | 68° | 78° | — | — |
| 1972 | 70° | 59° | 64° | — | — |
| 1971 | 90° | 67° | 78° | 1.14" | — |
55 years of data from BOSTON