Weather on August 18
Boston, MA
55 Years of Data
Avg High
80°F
Avg Low
65°F
Warmest
1987
85°F avg
Coldest
2000
63°F avg
About This Date
August 18th in Boston, MA typically brings warm summer weather, with average highs around 80°F and lows near 65°F. Over 55 years of records, the warmest August 18th was in 1987 (85°F average), while the coldest was 2000 (63°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 35% of August 18th dates historically, with the wettest August 18th recording 6.02" of rain. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Boston, MA? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 68° | 60° | 64° | — | — |
| 2024 | 69° | 65° | 67° | 0.08" | — |
| 2023 | 81° | 67° | 74° | 3.43" | — |
| 2022 | 84° | 66° | 75° | — | — |
| 2021 | 89° | 72° | 80° | — | — |
| 2020 | 86° | 66° | 76° | 0.41" | — |
| 2019 | 81° | 69° | 75° | 0.41" | — |
| 2018 | 88° | 67° | 77° | 0.33" | — |
| 2017 | 81° | 65° | 73° | 0.61" | — |
| 2016 | 90° | 69° | 79° | — | — |
| 2015 | 87° | 71° | 79° | 0.36" | — |
| 2014 | 79° | 62° | 70° | — | — |
| 2013 | 78° | 63° | 70° | — | — |
| 2012 | 72° | 64° | 68° | 0.1" | — |
| 2011 | 88° | 68° | 78° | — | — |
| 2010 | 81° | 68° | 74° | — | — |
| 2009 | 95° | 72° | 83° | — | — |
| 2008 | 87° | 69° | 78° | — | — |
| 2007 | 74° | 58° | 66° | 0.1" | — |
| 2006 | 82° | 66° | 74° | — | — |
| 2005 | 75° | 62° | 69° | — | — |
| 2004 | 81° | 61° | 71° | — | — |
| 2003 | 74° | 65° | 69° | — | — |
| 2002 | 95° | 72° | 83° | — | — |
| 2001 | 83° | 71° | 77° | — | — |
| 2000coldest | 71° | 56° | 63° | 0.33" | — |
| 1999 | 87° | 68° | 78° | — | — |
| 1998 | 87° | 61° | 74° | 1.47" | — |
| 1997 | 78° | 58° | 68° | 1.24" | — |
| 1996 | 80° | 68° | 74° | — | — |
| 1995 | 81° | 65° | 73° | — | — |
| 1994 | 87° | 65° | 76° | 6.02" | — |
| 1993 | 75° | 65° | 70° | — | — |
| 1992 | 69° | 62° | 66° | 2.9" | — |
| 1991 | 92° | 70° | 81° | — | — |
| 1990 | 90° | 70° | 80° | — | — |
| 1989 | 72° | 62° | 67° | — | — |
| 1988 | 78° | 62° | 70° | 0.03" | — |
| 1987warmest | 94° | 76° | 85° | — | — |
| 1986 | 70° | 64° | 67° | 2.69" | — |
| 1985 | 75° | 65° | 70° | — | — |
| 1984 | 72° | 59° | 65° | — | — |
| 1983 | 75° | 68° | 72° | 0.66" | — |
| 1982 | 71° | 64° | 68° | — | — |
| 1981 | 78° | 60° | 69° | — | — |
| 1980 | 76° | 61° | 68° | — | — |
| 1979 | 72° | 60° | 66° | 0.48" | — |
| 1978 | 85° | 70° | 77° | — | — |
| 1977 | 75° | 63° | 69° | — | — |
| 1976 | 74° | 60° | 67° | — | — |
| 1975 | 87° | 66° | 77° | — | — |
| 1974 | 78° | 69° | 74° | — | — |
| 1973 | 80° | 65° | 72° | — | — |
| 1972 | 79° | 63° | 71° | 0.1" | — |
| 1971 | 81° | 66° | 73° | — | — |
55 years of data from BOSTON