Weather on August 20
Charleston, SC
55 Years of Data
Avg High
87°F
Avg Low
76°F
Warmest
1978
87°F avg
Coldest
1981
71°F avg
About This Date
August 20th 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 20th was in 1978 (87°F average), while the coldest was 1981 (71°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 40% of August 20th dates historically, with the wettest August 20th recording 5.03" 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 20th in Charleston, SC? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 76° | 81° | — | — |
| 2024 | 86° | 75° | 81° | 1.37" | — |
| 2023 | 89° | 80° | 85° | — | — |
| 2022 | 90° | 75° | 82° | — | — |
| 2021 | 94° | 81° | 87° | 0.08" | — |
| 2020 | 86° | 75° | 81° | 0.25" | — |
| 2019 | 86° | 80° | 83° | — | — |
| 2018 | 88° | 78° | 83° | — | — |
| 2017 | 89° | 82° | 86° | — | — |
| 2016 | 92° | 78° | 85° | 0.36" | — |
| 2015 | 90° | 77° | 83° | 0.36" | — |
| 2014 | 94° | 75° | 84° | — | — |
| 2013 | 85° | 77° | 81° | — | — |
| 2012 | 85° | 75° | 80° | 0.08" | — |
| 2011 | 87° | 79° | 83° | — | — |
| 2010 | 89° | 78° | 84° | 4.8" | — |
| 2009 | 87° | 81° | 84° | — | — |
| 2008 | 83° | 76° | 79° | 1.6" | — |
| 2007 | 90° | 81° | 85° | — | — |
| 2006 | 86° | 80° | 83° | — | — |
| 2005 | 93° | 80° | 87° | — | — |
| 2004 | 84° | 78° | 81° | — | — |
| 2003 | 84° | 78° | 81° | — | — |
| 2002 | 86° | 77° | 82° | — | — |
| 2001 | 84° | 73° | 79° | 1.32" | — |
| 2000 | 85° | 73° | 79° | — | — |
| 1999 | 93° | 75° | 84° | — | — |
| 1998 | 83° | 77° | 80° | — | — |
| 1997 | 88° | 77° | 82° | 0.71" | — |
| 1996 | 84° | 76° | 80° | — | — |
| 1995 | 82° | 78° | 80° | — | — |
| 1994 | 84° | 73° | 79° | 3.35" | — |
| 1993 | 84° | 77° | 81° | — | — |
| 1992 | 86° | 74° | 80° | — | — |
| 1991 | 90° | 78° | 84° | — | — |
| 1990 | 84° | 75° | 80° | 5.03" | — |
| 1989 | 84° | 79° | 81° | — | — |
| 1988 | 87° | 80° | 84° | 0.25" | — |
| 1987 | 82° | 77° | 80° | — | — |
| 1986 | 81° | 73° | 77° | 2.67" | — |
| 1985 | 94° | 78° | 86° | — | — |
| 1984 | 87° | 74° | 80° | 0.56" | — |
| 1983 | 94° | 78° | 86° | — | — |
| 1982 | 88° | 75° | 81° | 0.23" | — |
| 1981coldest | 73° | 68° | 71° | — | — |
| 1980 | 94° | 76° | 85° | — | — |
| 1979 | 95° | 76° | 85° | — | — |
| 1978warmest | 93° | 80° | 87° | — | — |
| 1977 | 83° | 71° | 77° | — | — |
| 1976 | 78° | 67° | 72° | 2.34" | — |
| 1975 | 88° | 73° | 80° | 0.23" | — |
| 1974 | 82° | 70° | 76° | 4.17" | — |
| 1973 | 89° | 72° | 80° | 0.97" | — |
| 1972 | 83° | 75° | 79° | 0.84" | — |
| 1971 | 92° | 78° | 85° | 1.52" | — |
55 years of data from DWTN CHARLESTON