Weather on July 21
Cambridge, MA
55 Years of Data
Avg High
86°F
Avg Low
65°F
Warmest
2019
86°F avg
Coldest
1974
62°F avg
About This Date
July 21st in Cambridge, MA typically brings warm summer weather, with average highs around 86°F and lows near 65°F. Over 55 years of records, the warmest July 21st was in 2019 (86°F average), while the coldest was 1974 (62°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 29% of July 21st dates historically, with the wettest July 21st recording 4.14" of rain. The last decade has been 6.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.7°F warmer on this date compared to 20-30 years ago.
Planning for July 21st in Cambridge, MA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 63° | 75° | 2.67" | — |
| 2024 | 88° | 67° | 77° | — | — |
| 2023 | 85° | 64° | 74° | — | — |
| 2022 | 98° | 73° | 86° | — | — |
| 2021 | 87° | 64° | 76° | 0.1" | — |
| 2020 | 95° | 72° | 83° | — | — |
| 2019warmest | 97° | 76° | 86° | — | — |
| 2018 | 87° | 56° | 71° | — | — |
| 2017 | 94° | 67° | 80° | — | — |
| 2016 | 86° | 60° | 73° | — | — |
| 2015 | 94° | 68° | 81° | — | — |
| 2014 | 75° | 59° | 67° | — | — |
| 2013 | 95° | 70° | 82° | 0.1" | — |
| 2012 | 72° | 56° | 64° | — | — |
| 2011 | 91° | 68° | 80° | — | — |
| 2010 | 80° | 67° | 73° | — | — |
| 2009 | 79° | 65° | 72° | 0.13" | — |
| 2008 | 88° | 71° | 79° | 4.14" | — |
| 2007 | 75° | 63° | 69° | — | — |
| 2006 | 88° | 68° | 78° | 3.28" | — |
| 2005 | 83° | 71° | 77° | — | — |
| 2004 | 81° | 69° | 75° | — | — |
| 2003 | 84° | 66° | 75° | — | — |
| 2002 | 72° | 59° | 65° | — | — |
| 2001 | 85° | 55° | 70° | — | — |
| 2000 | 75° | 63° | 69° | — | — |
| 1999 | 83° | 54° | 68° | — | — |
| 1998 | 86° | 67° | 76° | 0.05" | — |
| 1997 | 80° | 65° | 72° | — | — |
| 1996 | 72° | 62° | 67° | — | — |
| 1995 | 89° | 69° | 79° | — | — |
| 1994 | 96° | 74° | 85° | — | — |
| 1993 | 89° | 63° | 76° | — | — |
| 1992 | 88° | 68° | 78° | — | — |
| 1991 | 99° | 71° | 85° | — | — |
| 1990 | 93° | 69° | 81° | 0.18" | — |
| 1989 | 77° | 62° | 70° | 3.18" | — |
| 1988 | 78° | 66° | 72° | 0.84" | — |
| 1987 | 88° | 67° | 77° | 0.03" | — |
| 1986 | 82° | 68° | 75° | — | — |
| 1985 | 90° | 65° | 77° | — | — |
| 1984 | 84° | 60° | 72° | — | — |
| 1983 | 91° | 60° | 76° | — | — |
| 1982 | 78° | 61° | 69° | 3.86" | — |
| 1981 | 80° | 67° | 73° | 1.24" | — |
| 1980 | 94° | 73° | 83° | — | — |
| 1979 | 88° | 62° | 75° | — | — |
| 1978 | 93° | 69° | 81° | — | — |
| 1977 | 95° | 76° | 85° | — | — |
| 1976 | 92° | 69° | 80° | 0.05" | — |
| 1975 | 82° | 69° | 76° | 1.47" | — |
| 1974coldest | 75° | 48° | 62° | — | — |
| 1973 | 88° | 68° | 78° | 3.05" | — |
| 1972 | 80° | 62° | 71° | — | — |
| 1971 | 78° | 60° | 69° | — | — |
55 years of data from CHESTNUT HILL