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Charleston, SC Weather on May 15
May 15th in Charleston, SC typically brings pleasant spring weather, with average highs around 79°F and lows near 68°F. Over 55 years of records, the warmest May 15th was in 1995 (81°F average), while the coldest was 1984 (65°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 20% of May 15th dates historically, with the wettest May 15th recording 5.92" of rain. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
What to Expect on May 15
Planning for May 15th in Charleston, SC? Great weather for outdoor activities.
May 15 Weather Records for Charleston
- •The all-time record high for May 15th in Charleston, SC is 93°F, set in 1995.
- •The coldest May 15th on record dropped to 58°F in 1999.
- •Temperatures have reached 90°F or higher on May 15th in 2 of the last 55 years.
- •Last year (1971), May 15th was 9°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest May 15 ever in Charleston?
The warmest May 15 in Charleston, SC reached 93°F in 1995. That is 14°F above the long-term average high of 79°F.
What was the coldest May 15 ever in Charleston?
The coldest May 15 in Charleston, SC dropped to 58°F in 1999. That is 10°F below the long-term average low of 68°F.
What is the average temperature on May 15 in Charleston?
On May 15, Charleston averages a high of 79°F and a low of 68°F based on 55 years of NOAA weather observations from DWTN CHARLESTON.
How many years of weather data are available for May 15 in Charleston?
We have 55 years of weather records for May 15 in Charleston, SC, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
May 15 Weather History in Charleston
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 82°F | 74°F | 0" | -- |
| 2024 | 82°F | 72°F | 0" | -- |
| 2023 | 77°F | 72°F | 0" | -- |
| 2022 | 81°F | 69°F | 0" | -- |
| 2021 | 75°F | 60°F | 0" | -- |
| 2020 | 77°F | 69°F | 0" | -- |
| 2019 | 71°F | 63°F | 0" | -- |
| 2018 | 79°F | 75°F | 0.03" | -- |
| 2017 | 85°F | 66°F | 0" | -- |
| 2016 | 74°F | 64°F | 0" | -- |
| 2015 | 75°F | 70°F | 0" | -- |
| 2014 | 78°F | 71°F | 2.21" | -- |
| 2013 | 79°F | 64°F | 0" | -- |
| 2012 | 80°F | 73°F | 0" | -- |
| 2011 | 81°F | 66°F | 0.36" | -- |
| 2010 | 80°F | 70°F | 0" | -- |
| 2009 | 78°F | 72°F | 0" | -- |
| 2008 | 76°F | 68°F | 0" | -- |
| 2007 | 75°F | 65°F | 0" | -- |
| 2006 | 71°F | 65°F | 0.15" | -- |
| 2005 | 78°F | 69°F | 0" | -- |
| 2004 | 78°F | 73°F | 0" | -- |
| 2003 | 76°F | 64°F | 1.88" | -- |
| 2002 | 72°F | 63°F | 0" | -- |
| 2001 | 88°F | 67°F | 0" | -- |
| 2000 | 78°F | 68°F | 0" | -- |
| 1999 | 77°F | 58°F | 0" | -- |
| 1998 | 81°F | 67°F | 0" | -- |
| 1997 | 83°F | 69°F | 0" | -- |
| 1996 | 70°F | 60°F | 0" | -- |
| 1995 | 93°F | 70°F | 2.57" | -- |
| 1994 | 82°F | 71°F | 0.03" | -- |
| 1993 | 77°F | 65°F | 0" | -- |
| 1992 | 76°F | 69°F | 0" | -- |
| 1991 | 87°F | 73°F | 0" | -- |
| 1990 | 80°F | 72°F | 0" | -- |
| 1989 | 84°F | 67°F | 0" | -- |
| 1988 | 80°F | 66°F | 0" | -- |
| 1987 | 75°F | 70°F | 0" | -- |
| 1986 | 74°F | 68°F | 0" | -- |
| 1985 | 82°F | 70°F | 0" | -- |
| 1984 | 70°F | 60°F | 0" | -- |
| 1983 | 81°F | 69°F | 0" | -- |
| 1982 | 85°F | 67°F | 0" | -- |
| 1981 | 84°F | 66°F | 0" | -- |
| 1980 | 74°F | 69°F | 0" | -- |
| 1979 | 76°F | 63°F | 0" | -- |
| 1978 | 75°F | 60°F | 0.89" | -- |
| 1977 | 90°F | 68°F | 0" | -- |
| 1976 | 80°F | 71°F | 2.36" | -- |
| 1975 | 83°F | 73°F | 0.03" | -- |
| 1974 | 80°F | 69°F | 0" | -- |
| 1973 | 77°F | 63°F | 0" | -- |
| 1972 | 81°F | 70°F | 0" | -- |
| 1971 | 70°F | 65°F | 5.92" | -- |
Based on 55 years of data from NOAA station: DWTN CHARLESTON
Monthly Climate Averages
Historical temperature and precipitation averages for Charleston, SC, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.