Weather on May 20
Boston, MA
55 Years of Data
Avg High
69°F
Avg Low
51°F
Warmest
2019
77°F avg
Coldest
1987
48°F avg
About This Date
May 20th in Boston, MA typically brings mild spring weather, with average highs around 69°F and lows near 51°F. Over 55 years of records, the warmest May 20th was in 2019 (77°F average), while the coldest was 1987 (48°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 20th dates historically, with the wettest May 20th recording 4.65" 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 May 20th in Boston, MA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 57° | 49° | 53° | — | — |
| 2024 | 60° | 52° | 56° | — | — |
| 2023 | 66° | 53° | 60° | 4.65" | — |
| 2022 | 66° | 52° | 59° | — | — |
| 2021 | 69° | 55° | 62° | — | — |
| 2020 | 58° | 45° | 51° | — | — |
| 2019warmest | 88° | 66° | 77° | 0.33" | — |
| 2018 | 81° | 54° | 67° | 0.2" | — |
| 2017 | 59° | 52° | 55° | — | — |
| 2016 | 71° | 51° | 61° | — | — |
| 2015 | 66° | 51° | 59° | — | — |
| 2014 | 69° | 53° | 61° | — | — |
| 2013 | 82° | 56° | 69° | 0.1" | — |
| 2012 | 71° | 55° | 63° | — | — |
| 2011 | 65° | 51° | 58° | 0.03" | — |
| 2010 | 84° | 53° | 69° | — | — |
| 2009 | 80° | 52° | 66° | — | — |
| 2008 | 66° | 45° | 55° | — | — |
| 2007 | 64° | 50° | 57° | 1.32" | — |
| 2006 | 68° | 50° | 59° | — | — |
| 2005 | 64° | 48° | 56° | — | — |
| 2004 | 72° | 52° | 62° | — | — |
| 2003 | 82° | 51° | 67° | — | — |
| 2002 | 57° | 42° | 50° | — | — |
| 2001 | 60° | 49° | 54° | — | — |
| 2000 | 54° | 44° | 49° | — | — |
| 1999 | 69° | 53° | 61° | 0.53" | — |
| 1998 | 78° | 54° | 66° | — | — |
| 1997 | 71° | 46° | 59° | 0.91" | — |
| 1996 | 91° | 53° | 72° | — | — |
| 1995 | 76° | 51° | 63° | — | — |
| 1994 | 57° | 44° | 51° | — | — |
| 1993 | 52° | 49° | 50° | 0.2" | — |
| 1992 | 74° | 50° | 62° | — | — |
| 1991 | 70° | 47° | 58° | — | — |
| 1990 | 52° | 44° | 48° | 0.41" | — |
| 1989 | 79° | 54° | 66° | — | — |
| 1988 | 58° | 50° | 54° | 0.3" | — |
| 1987coldest | 54° | 43° | 48° | — | — |
| 1986 | 80° | 60° | 70° | — | — |
| 1985 | 83° | 55° | 69° | — | — |
| 1984 | 64° | 53° | 59° | 0.2" | — |
| 1983 | 67° | 56° | 61° | 0.3" | — |
| 1982 | 84° | 63° | 73° | 0.58" | — |
| 1981 | 67° | 50° | 58° | — | — |
| 1980 | 66° | 46° | 56° | — | — |
| 1979 | 58° | 52° | 55° | 1.78" | — |
| 1978 | 82° | 57° | 70° | — | — |
| 1977 | 80° | 50° | 65° | — | — |
| 1976 | 60° | 47° | 53° | 0.08" | — |
| 1975 | 90° | 61° | 75° | — | — |
| 1974 | 58° | 46° | 52° | — | — |
| 1973 | 67° | 50° | 58° | 2.18" | — |
| 1972 | 51° | 47° | 49° | 1.85" | — |
| 1971 | 54° | 46° | 50° | — | — |
55 years of data from BOSTON