Weather on August 31
Boston, MA
55 Years of Data
Avg High
78°F
Avg Low
63°F
Warmest
2010
86°F avg
Coldest
1985
58°F avg
About This Date
August 31st in Boston, MA typically brings pleasant summer weather, with average highs around 78°F and lows near 63°F. Over 55 years of records, the warmest August 31st was in 2010 (86°F average), while the coldest was 1985 (58°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 24% of August 31st dates historically, with the wettest August 31st recording 1.68" 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 August 31st in Boston, MA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 59° | 65° | — | — |
| 2024 | 79° | 62° | 70° | — | — |
| 2023 | 73° | 61° | 67° | — | — |
| 2022 | 86° | 68° | 77° | 0.84" | — |
| 2021 | 84° | 73° | 79° | — | — |
| 2020 | 71° | 58° | 64° | — | — |
| 2019 | 81° | 68° | 74° | — | — |
| 2018 | 73° | 63° | 68° | — | — |
| 2017 | 79° | 60° | 69° | — | — |
| 2016 | 82° | 68° | 75° | — | — |
| 2015 | 90° | 71° | 80° | — | — |
| 2014 | 85° | 67° | 76° | 1.37" | — |
| 2013 | 82° | 69° | 76° | — | — |
| 2012 | 90° | 68° | 79° | — | — |
| 2011 | 81° | 63° | 72° | — | — |
| 2010warmest | 96° | 75° | 86° | — | — |
| 2009 | 71° | 60° | 66° | — | — |
| 2008 | 82° | 67° | 74° | — | — |
| 2007 | 75° | 64° | 70° | 0.03" | — |
| 2006 | 74° | 55° | 64° | — | — |
| 2005 | 83° | 72° | 77° | 0.08" | — |
| 2004 | 82° | 66° | 74° | 0.43" | — |
| 2003 | 67° | 55° | 61° | — | — |
| 2002 | 66° | 59° | 63° | — | — |
| 2001 | 84° | 69° | 77° | — | — |
| 2000 | 86° | 67° | 76° | — | — |
| 1999 | 71° | 58° | 64° | — | — |
| 1998 | 77° | 67° | 72° | 0.05" | — |
| 1997 | 70° | 62° | 66° | — | — |
| 1996 | 83° | 59° | 71° | — | — |
| 1995 | 86° | 60° | 73° | — | — |
| 1994 | 71° | 62° | 67° | — | — |
| 1993 | 87° | 70° | 78° | — | — |
| 1992 | 81° | 64° | 72° | — | — |
| 1991 | 86° | 61° | 73° | 0.51" | — |
| 1990 | 78° | 62° | 70° | — | — |
| 1989 | 78° | 62° | 70° | — | — |
| 1988 | 73° | 59° | 66° | — | — |
| 1987 | 77° | 58° | 67° | — | — |
| 1986 | 76° | 56° | 66° | — | — |
| 1985coldest | 62° | 53° | 58° | 0.71" | — |
| 1984 | 84° | 69° | 77° | 0.03" | — |
| 1983 | 79° | 65° | 72° | 1.68" | — |
| 1982 | 81° | 58° | 69° | 0.03" | — |
| 1981 | 73° | 61° | 67° | — | — |
| 1980 | 88° | 71° | 79° | — | — |
| 1979 | 81° | 66° | 73° | — | — |
| 1978 | 70° | 62° | 66° | 0.13" | — |
| 1977 | 69° | 61° | 65° | — | — |
| 1976 | 72° | 49° | 60° | — | — |
| 1975 | 66° | 53° | 60° | — | — |
| 1974 | 80° | 60° | 70° | — | — |
| 1973 | 90° | 68° | 79° | 1.09" | — |
| 1972 | 82° | 63° | 72° | — | — |
| 1971 | 70° | 61° | 65° | — | — |
55 years of data from BOSTON