Weather on August 20
Boston, MA
55 Years of Data
Avg High
78°F
Avg Low
64°F
Warmest
1983
85°F avg
Coldest
2025
61°F avg
About This Date
August 20th in Boston, MA typically brings pleasant summer weather, with average highs around 78°F and lows near 64°F. Over 55 years of records, the warmest August 20th was in 1983 (85°F average), while the coldest was 2025 (61°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 31% of August 20th dates historically, with the wettest August 20th recording 2.03" of rain. The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Boston, MA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025coldest | 66° | 56° | 61° | 0.61" | — |
| 2024 | 70° | 60° | 65° | 0.03" | — |
| 2023 | 84° | 66° | 75° | — | — |
| 2022 | 90° | 70° | 80° | — | — |
| 2021 | 80° | 73° | 77° | 0.13" | — |
| 2020 | 81° | 61° | 71° | — | — |
| 2019 | 84° | 71° | 78° | — | — |
| 2018 | 74° | 67° | 70° | — | — |
| 2017 | 85° | 72° | 78° | — | — |
| 2016 | 86° | 66° | 76° | — | — |
| 2015 | 78° | 68° | 73° | — | — |
| 2014 | 74° | 59° | 66° | — | — |
| 2013 | 87° | 69° | 78° | — | — |
| 2012 | 75° | 62° | 69° | — | — |
| 2011 | 84° | 72° | 78° | — | — |
| 2010 | 86° | 67° | 76° | — | — |
| 2009 | 80° | 71° | 76° | 0.71" | — |
| 2008 | 75° | 56° | 65° | — | — |
| 2007 | 68° | 56° | 62° | — | — |
| 2006 | 84° | 63° | 73° | 2.03" | — |
| 2005 | 74° | 65° | 69° | — | — |
| 2004 | 90° | 70° | 80° | 0.28" | — |
| 2003 | 89° | 69° | 79° | — | — |
| 2002 | 76° | 66° | 71° | 0.86" | — |
| 2001 | 73° | 67° | 70° | 0.76" | — |
| 2000 | 72° | 58° | 65° | — | — |
| 1999 | 73° | 59° | 66° | 0.03" | — |
| 1998 | 71° | 57° | 64° | — | — |
| 1997 | 73° | 58° | 65° | 0.2" | — |
| 1996 | 81° | 60° | 70° | — | — |
| 1995 | 71° | 57° | 64° | — | — |
| 1994 | 81° | 64° | 72° | — | — |
| 1993 | 84° | 64° | 74° | 1.65" | — |
| 1992 | 75° | 60° | 68° | — | — |
| 1991 | 67° | 59° | 63° | 0.97" | — |
| 1990 | 68° | 55° | 62° | — | — |
| 1989 | 83° | 66° | 74° | — | — |
| 1988 | 77° | 59° | 68° | — | — |
| 1987 | 86° | 66° | 76° | 0.13" | — |
| 1986 | 76° | 64° | 70° | — | — |
| 1985 | 80° | 62° | 71° | — | — |
| 1984 | 76° | 62° | 69° | 1.47" | — |
| 1983warmest | 97° | 74° | 85° | — | — |
| 1982 | 83° | 70° | 76° | 0.2" | — |
| 1981 | 75° | 58° | 66° | — | — |
| 1980 | 64° | 60° | 62° | 0.23" | — |
| 1979 | 72° | 62° | 67° | — | — |
| 1978 | 85° | 68° | 76° | — | — |
| 1977 | 79° | 58° | 68° | — | — |
| 1976 | 87° | 57° | 72° | — | — |
| 1975 | 80° | 61° | 70° | — | — |
| 1974 | 75° | 64° | 70° | — | — |
| 1973 | 74° | 63° | 68° | — | — |
| 1972 | 71° | 62° | 67° | — | — |
| 1971 | 88° | 69° | 78° | 0.58" | — |
55 years of data from BOSTON