Weather on May 21
Deltona, FL
55 Years of Data
Avg High
88°F
Avg Low
67°F
Warmest
2025
84°F avg
Coldest
1994
67°F avg
About This Date
May 21st in Deltona, FL typically brings warm spring weather, with average highs around 88°F and lows near 67°F. Over 55 years of records, the warmest May 21st was in 2025 (84°F average), while the coldest was 1994 (67°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 25% of May 21st dates historically, with the wettest May 21st recording 3.89" of rain. The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Deltona, FL? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 94° | 75° | 84° | — | — |
| 2024 | 87° | 68° | 78° | — | — |
| 2023 | 89° | 73° | 81° | 0.05" | — |
| 2022 | — | 71° | — | 1.93" | — |
| 2021 | 84° | 69° | 77° | — | — |
| 2020 | 93° | 69° | 81° | — | — |
| 2019 | 91° | 71° | 81° | — | — |
| 2018 | 77° | 70° | 73° | 1.27" | — |
| 2017 | 93° | 73° | 83° | — | — |
| 2016 | 89° | 71° | 80° | 0.76" | — |
| 2015 | 93° | 72° | 82° | — | — |
| 2014 | 84° | 62° | 73° | — | — |
| 2013 | 90° | 71° | 80° | 0.51" | — |
| 2012 | 88° | 66° | 77° | — | — |
| 2011 | 95° | 69° | 82° | — | — |
| 2010 | 94° | 72° | 83° | — | — |
| 2009 | 76° | 67° | 71° | 3.89" | — |
| 2008 | 89° | 70° | 79° | 0.1" | — |
| 2007 | 83° | 60° | 71° | — | — |
| 2006 | 93° | 67° | 80° | — | — |
| 2005 | 90° | 67° | 78° | — | — |
| 2004 | 88° | 68° | 78° | 0.03" | — |
| 2003 | 88° | 73° | 80° | — | — |
| 2002 | 78° | 62° | 70° | — | — |
| 2001 | 91° | 64° | 78° | — | — |
| 2000 | 92° | 69° | 80° | — | — |
| 1999 | 89° | 65° | 77° | — | — |
| 1998 | 94° | 65° | 79° | — | — |
| 1997 | 94° | 71° | 82° | — | — |
| 1996 | 91° | 70° | 80° | 0.05" | — |
| 1995 | 90° | 72° | 81° | — | — |
| 1994coldest | 75° | 59° | 67° | — | — |
| 1993 | 90° | 63° | 76° | — | — |
| 1992 | 84° | 66° | 75° | — | — |
| 1991 | 86° | 70° | 78° | 0.89" | — |
| 1990 | 94° | 72° | 83° | 2.16" | — |
| 1989 | 92° | 63° | 77° | — | — |
| 1988 | 88° | 62° | 75° | — | — |
| 1987 | 89° | 66° | 78° | — | — |
| 1986 | 87° | 62° | 75° | 0.94" | — |
| 1985 | 91° | 68° | 80° | 1.83" | — |
| 1984 | 85° | 66° | 75° | — | — |
| 1983 | 87° | 67° | 77° | — | — |
| 1982 | 86° | 61° | 73° | — | — |
| 1981 | 88° | 65° | 76° | 0.43" | — |
| 1980 | 92° | 69° | 80° | — | — |
| 1979 | 87° | — | — | — | — |
| 1978 | 84° | 64° | 74° | — | — |
| 1977 | 88° | 57° | 72° | — | — |
| 1976 | 82° | 61° | 71° | — | — |
| 1975 | 90° | 66° | 78° | — | — |
| 1974 | 89° | 65° | 77° | — | — |
| 1973 | 91° | 64° | 78° | — | — |
| 1972 | 84° | 59° | 72° | — | — |
| 1971 | 91° | 67° | 79° | — | — |
55 years of data from SANFORD