Weather on September 21
Lowell, MA
55 Years of Data
Avg High
73°F
Avg Low
49°F
Warmest
1980
74°F avg
Coldest
1977
46°F avg
About This Date
September 21st in Lowell, MA typically brings pleasant fall weather, with average highs around 73°F and lows near 49°F. Over 55 years of records, the warmest September 21st was in 1980 (74°F average), while the coldest was 1977 (46°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 35% of September 21st dates historically, with the wettest September 21st recording 5.13" of rain. The last decade has been 4.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.0°F cooler on this date compared to 20-30 years ago.
Planning for September 21st in Lowell, MA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 44° | 58° | — | — |
| 2024 | 64° | 57° | 61° | 0.56" | — |
| 2023 | 75° | 49° | 62° | — | — |
| 2022 | 65° | 55° | 60° | 0.08" | — |
| 2021 | 77° | 49° | 63° | — | — |
| 2020 | 65° | 30° | 48° | — | — |
| 2019 | 80° | 41° | 61° | — | — |
| 2018 | 68° | 58° | 63° | — | — |
| 2017 | 71° | 65° | 68° | 0.05" | — |
| 2016 | 82° | 56° | 69° | — | — |
| 2015 | 71° | 44° | 58° | — | — |
| 2014 | 70° | 34° | 52° | 0.99" | — |
| 2013 | 81° | 47° | 64° | — | — |
| 2012 | 68° | 41° | 55° | — | — |
| 2011 | 65° | 49° | 57° | 0.97" | — |
| 2010 | 69° | 42° | 56° | — | — |
| 2009 | 75° | 38° | 56° | — | — |
| 2008 | 69° | 40° | 54° | — | — |
| 2007 | 83° | 49° | 66° | — | — |
| 2006 | 74° | 50° | 62° | — | — |
| 2005 | 76° | 54° | 65° | 0.08" | — |
| 2004 | 71° | 42° | 57° | — | — |
| 2003 | 84° | 55° | 70° | — | — |
| 2002 | 81° | 58° | 69° | — | — |
| 2001 | 71° | 59° | 65° | 0.25" | — |
| 2000 | 83° | 59° | 71° | 0.05" | — |
| 1999 | 75° | 45° | 60° | — | — |
| 1998 | 87° | 55° | 71° | — | — |
| 1997 | 83° | 45° | 64° | 0.79" | — |
| 1996 | 76° | 46° | 61° | — | — |
| 1995 | 68° | 43° | 55° | — | — |
| 1994 | 77° | 42° | 60° | — | — |
| 1993 | 62° | 32° | 47° | — | — |
| 1992 | 70° | 43° | 56° | — | — |
| 1991 | 62° | 39° | 51° | 0.08" | — |
| 1990 | 68° | 45° | 56° | — | — |
| 1989 | 71° | 58° | 64° | 2.29" | — |
| 1988 | 75° | 64° | 70° | 0.33" | — |
| 1987 | 55° | 53° | 54° | 1.65" | — |
| 1986 | 73° | 51° | 62° | — | — |
| 1985 | 83° | 60° | 71° | — | — |
| 1984 | 70° | 45° | 57° | — | — |
| 1983 | 82° | 63° | 72° | — | — |
| 1982 | 60° | 50° | 55° | 0.03" | — |
| 1981 | 66° | 42° | 54° | — | — |
| 1980warmest | 85° | 63° | 74° | — | — |
| 1979 | 75° | 36° | 55° | — | — |
| 1978 | 86° | 56° | 71° | — | — |
| 1977coldest | 50° | 43° | 46° | 5.13" | — |
| 1976 | 82° | 55° | 69° | 0.05" | — |
| 1975 | 71° | 61° | 66° | 0.05" | — |
| 1974 | 79° | 58° | 68° | 0.81" | — |
| 1973 | 71° | 31° | 51° | — | — |
| 1972 | 61° | 36° | 48° | — | — |
| 1971 | 70° | 56° | 63° | 0.25" | — |
55 years of data from LOWELL