Weather on May 21
Charleston, SC
55 Years of Data
Avg High
81°F
Avg Low
69°F
Warmest
1998
87°F avg
Coldest
1994
61°F avg
About This Date
May 21st in Charleston, SC typically brings warm spring weather, with average highs around 81°F and lows near 69°F. Over 55 years of records, the warmest May 21st was in 1998 (87°F average), while the coldest was 1994 (61°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 22% of May 21st dates historically, with the wettest May 21st recording 3.61" 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 May 21st in Charleston, SC? 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 |
|---|---|---|---|---|---|
| 2025 | 92° | 78° | 85° | — | — |
| 2024 | 77° | 67° | 72° | — | — |
| 2023 | 78° | 70° | 74° | 0.08" | — |
| 2022 | 81° | 75° | 78° | — | — |
| 2021 | 79° | 68° | 73° | — | — |
| 2020 | 80° | 72° | 76° | 0.03" | — |
| 2019 | 85° | 76° | 80° | — | — |
| 2018 | 80° | 73° | 77° | — | — |
| 2017 | 79° | 76° | 77° | — | — |
| 2016 | 84° | 71° | 78° | 0.05" | — |
| 2015 | 90° | 73° | 81° | — | — |
| 2014 | 83° | 66° | 74° | — | — |
| 2013 | 81° | 67° | 74° | 2.08" | — |
| 2012 | 79° | 67° | 73° | — | — |
| 2011 | 84° | 72° | 78° | — | — |
| 2010 | 77° | 71° | 74° | — | — |
| 2009 | 74° | 68° | 71° | 0.03" | — |
| 2008 | 84° | 67° | 75° | 0.2" | — |
| 2007 | 79° | 65° | 72° | — | — |
| 2006 | 93° | 72° | 82° | — | — |
| 2005 | 69° | 58° | 63° | — | — |
| 2004 | 82° | 73° | 78° | — | — |
| 2003 | 77° | 68° | 73° | — | — |
| 2002 | 69° | 57° | 63° | — | — |
| 2001 | 87° | 75° | 81° | — | — |
| 2000 | 90° | 74° | 82° | — | — |
| 1999 | 80° | 67° | 73° | — | — |
| 1998warmest | 96° | 78° | 87° | — | — |
| 1997 | 77° | 70° | 73° | — | — |
| 1996 | 83° | 75° | 79° | — | — |
| 1995 | 80° | 67° | 73° | — | — |
| 1994coldest | 66° | 55° | 61° | — | — |
| 1993 | 73° | 59° | 66° | — | — |
| 1992 | 75° | 64° | 70° | 0.1" | — |
| 1991 | 77° | 72° | 74° | 2.9" | — |
| 1990 | 85° | 75° | 80° | 0.03" | — |
| 1989 | 85° | 69° | 77° | — | — |
| 1988 | 81° | 71° | 76° | — | — |
| 1987 | 76° | 68° | 72° | — | — |
| 1986 | 77° | 68° | 73° | — | — |
| 1985 | 82° | 69° | 76° | — | — |
| 1984 | 86° | 69° | 78° | — | — |
| 1983 | 82° | 69° | 76° | — | — |
| 1982 | 83° | 72° | 77° | — | — |
| 1981 | 73° | 56° | 64° | — | — |
| 1980 | 85° | 68° | 76° | — | — |
| 1979 | 76° | 65° | 70° | 2.24" | — |
| 1978 | 88° | 69° | 78° | — | — |
| 1977 | 81° | 68° | 74° | — | — |
| 1976 | 83° | 65° | 74° | — | — |
| 1975 | 85° | 70° | 77° | — | — |
| 1974 | 75° | 66° | 71° | — | — |
| 1973 | 79° | 64° | 71° | — | — |
| 1972 | 75° | 62° | 69° | 3.61" | — |
| 1971 | 77° | 67° | 72° | 1.07" | — |
55 years of data from DWTN CHARLESTON