Weather on May 21
Dayton, OH
55 Years of Data
Avg High
77°F
Avg Low
57°F
Warmest
1977
82°F avg
Coldest
2002
47°F avg
About This Date
May 21st in Dayton, OH typically brings pleasant spring weather, with average highs around 77°F and lows near 57°F. Over 55 years of records, the warmest May 21st was in 1977 (82°F average), while the coldest was 2002 (47°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 27% of May 21st dates historically, with the wettest May 21st recording 3.91" of rain. The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Dayton, OH? Great weather for outdoor activities.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 54° | 60° | 0.18" | — |
| 2024 | 87° | 69° | 78° | — | — |
| 2023 | 75° | 47° | 61° | — | — |
| 2022 | 85° | 66° | 75° | 3.91" | — |
| 2021 | 90° | 68° | 79° | — | — |
| 2020 | 59° | 51° | 55° | 0.05" | — |
| 2019 | 70° | 49° | 59° | — | — |
| 2018 | 83° | 62° | 72° | — | — |
| 2017 | 79° | 55° | 67° | 1.3" | — |
| 2016 | 75° | 57° | 66° | 0.79" | — |
| 2015 | 58° | 44° | 51° | 0.03" | — |
| 2014 | 80° | 61° | 70° | — | — |
| 2013 | 87° | 68° | 78° | — | — |
| 2012 | 80° | 62° | 71° | — | — |
| 2011 | 82° | 59° | 71° | — | — |
| 2010 | 78° | 52° | 65° | 0.58" | — |
| 2009 | 85° | 55° | 70° | — | — |
| 2008 | 66° | 48° | 57° | — | — |
| 2007 | 83° | 53° | 68° | — | — |
| 2006 | 71° | 51° | 61° | — | — |
| 2005 | 64° | 47° | 55° | — | — |
| 2004 | 83° | 69° | 76° | 0.13" | — |
| 2003 | 69° | 48° | 59° | 1.78" | — |
| 2002coldest | 52° | 42° | 47° | — | — |
| 2001 | 81° | 59° | 70° | — | — |
| 2000 | 62° | 52° | 57° | — | — |
| 1999 | 82° | 56° | 69° | — | — |
| 1998 | 89° | 62° | 76° | 2.54" | — |
| 1997 | 69° | 45° | 57° | — | — |
| 1996 | 92° | 65° | 78° | — | — |
| 1995 | 76° | 55° | 65° | — | — |
| 1994 | 77° | 50° | 64° | — | — |
| 1993 | 67° | 46° | 56° | — | — |
| 1992 | 80° | 62° | 71° | — | — |
| 1991 | 81° | 61° | 71° | — | — |
| 1990 | 78° | 56° | 67° | — | — |
| 1989 | 82° | 58° | 70° | 0.25" | — |
| 1988 | 72° | 56° | 64° | — | — |
| 1987 | 90° | 71° | 80° | 0.03" | — |
| 1986 | 52° | 47° | 49° | — | — |
| 1985 | 81° | 62° | 71° | — | — |
| 1984 | 72° | 55° | 63° | 0.79" | — |
| 1983 | 72° | 56° | 64° | — | — |
| 1982 | 84° | 62° | 73° | 2.49" | — |
| 1981 | 72° | 44° | 58° | — | — |
| 1980 | 72° | 56° | 64° | — | — |
| 1979 | 81° | 57° | 69° | — | — |
| 1978 | 85° | 58° | 71° | 0.69" | — |
| 1977warmest | 93° | 71° | 82° | — | — |
| 1976 | 83° | 57° | 70° | — | — |
| 1975 | 90° | 72° | 81° | — | — |
| 1974 | 83° | 59° | 71° | — | — |
| 1973 | 66° | 50° | 58° | — | — |
| 1972 | 77° | 59° | 68° | — | — |
| 1971 | 74° | 54° | 64° | — | — |
55 years of data from DAYTON MCD