Weather on October 21
Cambridge, MA
55 Years of Data
Avg High
62°F
Avg Low
42°F
Warmest
2007
65°F avg
Coldest
1974
32°F avg
About This Date
October 21st in Cambridge, MA typically brings mild fall weather, with average highs around 62°F and lows near 42°F. Over 55 years of records, the warmest October 21st was in 2007 (65°F average), while the coldest was 1974 (32°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 29% of October 21st dates historically, with the wettest October 21st recording 3.81" of rain. The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Cambridge, MA? Great weather for outdoor activities.
Warming Trend
1.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 47° | 56° | 2.06" | — |
| 2024 | 79° | 43° | 61° | — | — |
| 2023 | 68° | 47° | 57° | 0.08" | — |
| 2022 | 61° | 38° | 49° | — | — |
| 2021 | 74° | 51° | 62° | — | — |
| 2020 | 69° | 51° | 60° | 0.1" | — |
| 2019 | 61° | 38° | 49° | — | — |
| 2018 | 66° | 43° | 54° | 0.05" | — |
| 2017 | 71° | 43° | 57° | — | — |
| 2016 | 66° | 55° | 61° | 0.3" | — |
| 2015 | 67° | 50° | 58° | — | — |
| 2014 | 60° | 35° | 48° | — | — |
| 2013 | 62° | 39° | 51° | — | — |
| 2012 | 74° | 44° | 59° | — | — |
| 2011 | 68° | 47° | 57° | 0.05" | — |
| 2010 | 63° | 39° | 51° | — | — |
| 2009 | 64° | 36° | 50° | — | — |
| 2008 | 56° | 37° | 46° | — | — |
| 2007warmest | 75° | 55° | 65° | — | — |
| 2006 | 56° | 42° | 49° | — | — |
| 2005 | 58° | 44° | 51° | — | — |
| 2004 | 51° | 43° | 47° | — | — |
| 2003 | 70° | 46° | 58° | 0.05" | — |
| 2002 | 60° | 34° | 47° | — | — |
| 2001 | — | 41° | — | — | — |
| 2000 | 66° | 44° | 55° | — | — |
| 1999 | 54° | 42° | 48° | 1.85" | — |
| 1998 | 68° | 38° | 53° | — | — |
| 1997 | 64° | 39° | 52° | — | — |
| 1996 | 54° | 46° | 50° | — | — |
| 1995 | 65° | 51° | 58° | — | — |
| 1994 | 67° | 55° | 61° | 0.03" | — |
| 1993 | 50° | 45° | 47° | 0.15" | — |
| 1992 | 53° | 38° | 45° | — | — |
| 1991 | 58° | 28° | 43° | — | — |
| 1990 | 62° | 30° | 46° | — | — |
| 1989 | 66° | 46° | 56° | 2.26" | — |
| 1988 | 55° | 25° | 40° | — | — |
| 1987 | 67° | 47° | 57° | 0.13" | — |
| 1986 | 62° | 38° | 50° | — | — |
| 1985 | 60° | 52° | 56° | — | — |
| 1984 | 71° | 42° | 57° | — | — |
| 1983 | 41° | 30° | 36° | — | — |
| 1982 | 70° | 45° | 57° | — | — |
| 1981 | 57° | 32° | 45° | — | — |
| 1980 | 65° | 33° | 49° | — | — |
| 1979 | 72° | 54° | 63° | — | — |
| 1978 | 64° | 35° | 50° | — | — |
| 1977 | 50° | 47° | 48° | 1.27" | — |
| 1976 | 65° | — | — | 3.81" | — |
| 1975 | 57° | 48° | 53° | 0.13" | — |
| 1974coldest | 40° | 25° | 32° | — | — |
| 1973 | 54° | 37° | 45° | 0.25" | — |
| 1972 | 48° | 21° | 35° | — | — |
| 1971 | 64° | 42° | 53° | — | — |
55 years of data from CHESTNUT HILL