Weather on August 21
Charleston, SC
55 Years of Data
Avg High
87°F
Avg Low
76°F
Warmest
1983
88°F avg
Coldest
1976
72°F avg
About This Date
August 21st in Charleston, SC typically brings warm summer weather, with average highs around 87°F and lows near 76°F. Over 55 years of records, the warmest August 21st was in 1983 (88°F average), while the coldest was 1976 (72°F) — a 16°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 4.29" of rain. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for August 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 | 90° | 76° | 83° | — | — |
| 2024 | 82° | 74° | 78° | — | — |
| 2023 | 90° | 82° | 86° | — | — |
| 2022 | 84° | 76° | 80° | 0.71" | — |
| 2021 | 90° | 79° | 84° | 2.82" | — |
| 2020 | 86° | 72° | 79° | 2.92" | — |
| 2019 | 88° | 80° | 84° | — | — |
| 2018 | 88° | 78° | 83° | — | — |
| 2017 | 89° | 80° | 85° | — | — |
| 2016 | 94° | 80° | 87° | — | — |
| 2015 | 90° | 76° | 83° | 4.29" | — |
| 2014 | 96° | 77° | 87° | — | — |
| 2013 | 86° | 78° | 82° | — | — |
| 2012 | 82° | 75° | 79° | 0.05" | — |
| 2011 | 89° | 81° | 85° | — | — |
| 2010 | 87° | 80° | 84° | — | — |
| 2009 | 89° | 80° | 85° | — | — |
| 2008 | 82° | 74° | 78° | 1.37" | — |
| 2007 | 91° | 80° | 86° | — | — |
| 2006 | 87° | 81° | 84° | — | — |
| 2005 | 92° | 81° | 86° | — | — |
| 2004 | 86° | 79° | 82° | — | — |
| 2003 | 84° | 78° | 81° | — | — |
| 2002 | 87° | 79° | 83° | — | — |
| 2001 | 90° | 75° | 82° | — | — |
| 2000 | 79° | 68° | 73° | — | — |
| 1999 | 94° | 76° | 85° | — | — |
| 1998 | 85° | 73° | 79° | — | — |
| 1997 | 89° | 76° | 82° | — | — |
| 1996 | 82° | 72° | 77° | — | — |
| 1995 | 83° | 76° | 79° | — | — |
| 1994 | 87° | 74° | 80° | 1.6" | — |
| 1993 | 89° | 79° | 84° | — | — |
| 1992 | 81° | 73° | 77° | — | — |
| 1991 | 88° | 71° | 79° | — | — |
| 1990 | 88° | 79° | 83° | — | — |
| 1989 | 83° | 80° | 81° | — | — |
| 1988 | 91° | 73° | 82° | 2.29" | — |
| 1987 | 84° | 75° | 80° | — | — |
| 1986 | 83° | 77° | 80° | 1.14" | — |
| 1985 | 93° | 74° | 83° | 1.4" | — |
| 1984 | 84° | 74° | 79° | — | — |
| 1983warmest | 97° | 80° | 88° | — | — |
| 1982 | 91° | 76° | 83° | — | — |
| 1981 | 75° | 70° | 72° | 0.2" | — |
| 1980 | 95° | 77° | 86° | 0.08" | — |
| 1979 | 94° | 77° | 85° | — | — |
| 1978 | 86° | 79° | 82° | — | — |
| 1977 | 84° | 73° | 79° | — | — |
| 1976coldest | 75° | 68° | 72° | 0.03" | — |
| 1975 | 88° | 76° | 82° | — | — |
| 1974 | 83° | 69° | 76° | — | — |
| 1973 | 86° | 67° | 76° | 3.48" | — |
| 1972 | 84° | 70° | 77° | — | — |
| 1971 | 92° | 75° | 83° | 3.43" | — |
55 years of data from DWTN CHARLESTON