Weather on August 21
Dayton, OH
55 Years of Data
Avg High
85°F
Avg Low
64°F
Warmest
1983
86°F avg
Coldest
2024
62°F avg
About This Date
August 21st in Dayton, OH typically brings warm summer weather, with average highs around 85°F and lows near 64°F. Over 55 years of records, the warmest August 21st was in 1983 (86°F average), while the coldest was 2024 (62°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 27% of August 21st dates historically, with the wettest August 21st recording 5.51" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Dayton, OH? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 64° | 68° | — | — |
| 2024coldest | 73° | 50° | 62° | — | — |
| 2023 | 91° | 73° | 82° | — | — |
| 2022 | 83° | 66° | 74° | 0.84" | — |
| 2021 | 88° | 67° | 77° | — | — |
| 2020 | 88° | 64° | 76° | — | — |
| 2019 | 95° | 72° | 83° | — | — |
| 2018 | 85° | 68° | 76° | 0.86" | — |
| 2017 | 92° | 71° | 81° | — | — |
| 2016 | 81° | 62° | 71° | 2.51" | — |
| 2015 | 79° | 56° | 67° | — | — |
| 2014 | 90° | 67° | 78° | 0.1" | — |
| 2013 | 86° | 64° | 75° | — | — |
| 2012 | 82° | 58° | 70° | — | — |
| 2011 | 89° | 69° | 79° | — | — |
| 2010 | 93° | 73° | 83° | — | — |
| 2009 | 83° | 69° | 76° | 0.15" | — |
| 2008 | 88° | 63° | 75° | — | — |
| 2007 | 94° | 70° | 82° | 5.51" | — |
| 2006 | 79° | 59° | 69° | — | — |
| 2005 | 97° | 70° | 83° | 0.69" | — |
| 2004 | 75° | 56° | 65° | 0.2" | — |
| 2003 | 91° | 66° | 79° | — | — |
| 2002 | 83° | 64° | 73° | — | — |
| 2001 | 82° | 59° | 71° | — | — |
| 2000 | 79° | 56° | 67° | — | — |
| 1999 | 86° | 58° | 72° | — | — |
| 1998 | 90° | 59° | 74° | — | — |
| 1997 | 70° | 62° | 66° | 0.25" | — |
| 1996 | 94° | 71° | 82° | — | — |
| 1995 | 92° | 74° | 83° | — | — |
| 1994 | 86° | 66° | 76° | 0.38" | — |
| 1993 | 89° | 63° | 76° | — | — |
| 1992 | 78° | 55° | 67° | — | — |
| 1991 | 74° | 58° | 66° | 0.41" | — |
| 1990 | 83° | 68° | 75° | 0.79" | — |
| 1989 | 76° | 67° | 71° | 2.62" | — |
| 1988 | 84° | 63° | 73° | — | — |
| 1987 | 90° | 67° | 78° | — | — |
| 1986 | 88° | 62° | 75° | — | — |
| 1985 | 78° | 60° | 69° | — | — |
| 1984 | 81° | 56° | 68° | — | — |
| 1983warmest | 100° | 72° | 86° | — | — |
| 1982 | 76° | 59° | 67° | 0.61" | — |
| 1981 | 83° | 59° | 71° | — | — |
| 1980 | 92° | 72° | 82° | — | — |
| 1979 | 82° | 67° | 74° | 2.95" | — |
| 1978 | 78° | 55° | 67° | — | — |
| 1977 | 78° | 60° | 69° | — | — |
| 1976 | 86° | 60° | 73° | — | — |
| 1975 | 86° | 66° | 76° | — | — |
| 1974 | 88° | 66° | 77° | — | — |
| 1973 | 75° | 57° | 66° | — | — |
| 1972 | 86° | 65° | 75° | — | — |
| 1971 | 88° | 73° | 80° | — | — |
55 years of data from DAYTON MCD