Weather on August 21
Waterbury, CT
55 Years of Data
Avg High
81°F
Avg Low
61°F
Warmest
2009
82°F avg
Coldest
1977
58°F avg
About This Date
August 21st in Waterbury, CT typically brings warm summer weather, with average highs around 81°F and lows near 61°F. Over 51 years of records, the warmest August 21st was in 2009 (82°F average), while the coldest was 1977 (58°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 22% of August 21st dates historically, with the wettest August 21st recording 3.58" of rain. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Waterbury, CT? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 59° | 67° | 0.2" | — |
| 2024 | 76° | 55° | 65° | — | — |
| 2023 | 88° | 67° | 77° | — | — |
| 2022 | 84° | 66° | 75° | — | — |
| 2021 | 86° | 70° | 78° | 0.03" | — |
| 2020 | 80° | 57° | 69° | — | — |
| 2019 | 89° | 66° | 78° | — | — |
| 2018 | 76° | 61° | 68° | — | — |
| 2017 | 84° | 59° | 72° | — | — |
| 2016 | 83° | 72° | 77° | 3.58" | — |
| 2015 | 82° | 66° | 74° | 0.53" | — |
| 2014 | 78° | 66° | 72° | — | — |
| 2013 | 86° | 61° | 73° | — | — |
| 2012 | 82° | 67° | 74° | — | — |
| 2011 | 84° | 67° | 75° | 0.46" | — |
| 2010 | 77° | 61° | 69° | — | — |
| 2009warmest | 89° | 75° | 82° | 0.15" | — |
| 2008 | 78° | 56° | 67° | — | — |
| 2007 | 61° | 56° | 58° | 2.87" | — |
| 2006 | 81° | 62° | 71° | — | — |
| 2005 | 88° | 73° | 80° | — | — |
| 2004 | 78° | 62° | 70° | 2.92" | — |
| 2003 | 85° | 66° | 75° | — | — |
| 2002 | 80° | 61° | 70° | — | — |
| 2001 | 84° | 64° | 74° | — | — |
| 1999 | 61° | 57° | 59° | 0.2" | — |
| 1996 | 84° | 60° | 72° | — | — |
| 1995 | 93° | 49° | 71° | — | — |
| 1993 | 94° | 69° | 81° | — | — |
| 1992 | 77° | 47° | 62° | — | — |
| 1991 | 70° | 62° | 66° | 3.3" | — |
| 1990 | 72° | 56° | 64° | 0.03" | — |
| 1989 | 85° | 69° | 77° | — | — |
| 1988 | 81° | 53° | 67° | — | — |
| 1987 | 83° | 60° | 71° | — | — |
| 1986 | 76° | 64° | 70° | — | — |
| 1985 | 74° | 58° | 66° | — | — |
| 1984 | 78° | 50° | 64° | — | — |
| 1983 | 82° | 61° | 71° | — | — |
| 1982 | 76° | 60° | 68° | — | — |
| 1981 | 84° | 53° | 69° | — | — |
| 1980 | 73° | 62° | 68° | — | — |
| 1979 | 80° | 61° | 70° | — | — |
| 1978 | 81° | 60° | 70° | — | — |
| 1977coldest | 72° | 45° | 58° | — | — |
| 1976 | 90° | 59° | 74° | — | — |
| 1975 | 78° | 48° | 63° | — | — |
| 1974 | 84° | 59° | 72° | — | — |
| 1973 | 78° | 57° | 68° | — | — |
| 1972 | 81° | 52° | 66° | — | — |
| 1971 | 85° | 61° | 73° | — | — |
51 years of data from MT CARMEL