Weather on May 21
Cambridge, MA
55 Years of Data
Avg High
72°F
Avg Low
50°F
Warmest
1996
79°F avg
Coldest
1994
46°F avg
About This Date
May 21st in Cambridge, MA typically brings pleasant spring weather, with average highs around 72°F and lows near 50°F. Over 55 years of records, the warmest May 21st was in 1996 (79°F average), while the coldest was 1994 (46°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 36% of May 21st dates historically, with the wettest May 21st recording 4.34" 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 21st in Cambridge, MA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 47° | 56° | — | — |
| 2024 | 67° | 52° | 59° | — | — |
| 2023 | 67° | 57° | 62° | 4.34" | — |
| 2022 | 69° | 54° | 61° | 0.25" | — |
| 2021 | 77° | 51° | 64° | — | — |
| 2020 | 66° | 40° | 53° | — | — |
| 2019 | 87° | 55° | 71° | 0.05" | — |
| 2018 | 81° | 52° | 66° | 0.3" | — |
| 2017 | 68° | 44° | 56° | — | — |
| 2016 | 76° | 48° | 62° | — | — |
| 2015 | 67° | 41° | 54° | — | — |
| 2014 | 71° | 47° | 59° | — | — |
| 2013 | 82° | 58° | 70° | 0.2" | — |
| 2012 | 78° | 49° | 63° | — | — |
| 2011 | 67° | 52° | 59° | 0.03" | — |
| 2010 | 82° | 56° | 69° | — | — |
| 2009 | 83° | 56° | 69° | — | — |
| 2008 | 66° | 48° | 57° | — | — |
| 2007 | 66° | 50° | 58° | — | — |
| 2006 | 68° | 45° | 56° | 0.28" | — |
| 2005 | 54° | 46° | 50° | 0.58" | — |
| 2004 | 77° | 54° | 65° | — | — |
| 2003 | 70° | 55° | 62° | 0.23" | — |
| 2002 | 60° | 48° | 54° | — | — |
| 2001 | 64° | 47° | 55° | — | — |
| 2000 | 62° | 48° | 55° | — | — |
| 1999 | 78° | 45° | 61° | 0.2" | — |
| 1998 | 82° | 42° | 62° | — | — |
| 1997 | 72° | 44° | 58° | — | — |
| 1996warmest | 93° | 64° | 79° | — | — |
| 1995 | 74° | 45° | 59° | — | — |
| 1994coldest | 56° | 36° | 46° | — | — |
| 1993 | 52° | 47° | 49° | 0.36" | — |
| 1992 | 84° | 45° | 64° | — | — |
| 1991 | 78° | 50° | 64° | — | — |
| 1990 | 61° | 42° | 51° | 0.76" | — |
| 1989 | 90° | 55° | 72° | — | — |
| 1988 | 60° | 49° | 54° | 0.46" | — |
| 1987 | 65° | 40° | 52° | — | — |
| 1986 | 83° | 61° | 72° | — | — |
| 1985 | 84° | 65° | 74° | — | — |
| 1984 | 73° | 52° | 62° | 0.43" | — |
| 1983 | 65° | 49° | 57° | — | — |
| 1982 | 82° | 53° | 68° | 0.53" | — |
| 1981 | 75° | 44° | 60° | — | — |
| 1980 | 68° | 35° | 52° | — | — |
| 1979 | 59° | 51° | 55° | 0.08" | — |
| 1978 | 89° | 62° | 76° | 0.18" | — |
| 1977 | 85° | 55° | 70° | — | — |
| 1976 | — | 43° | — | 0.08" | — |
| 1975 | 92° | 65° | 78° | — | — |
| 1974 | 68° | 39° | 54° | — | — |
| 1973 | 69° | 51° | 60° | 3.18" | — |
| 1972 | 60° | 48° | 54° | 0.05" | — |
| 1971 | 66° | 48° | 57° | — | — |
55 years of data from CHESTNUT HILL