Local Forecast for Charleston, SC Currently 74.0°F HI: 81°F LO: 69°F Extended Forecast Overnight Partly cloudy, with a low around 69. South wind around 5 mph. Monday A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. South wind around 8 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible. Monday Night A chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 68. South wind 3 to 7 mph. Chance of precipitation is 30%. Tuesday A slight chance of showers and thunderstorms. Partly sunny, with a high near 85. Light south wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 20%. Tuesday Night A slight chance of showers and thunderstorms before 9pm. Mostly cloudy, with a low around 69. South wind 5 to 9 mph. Chance of precipitation is 20%. Wednesday Partly sunny, with a high near 86. Wednesday Night Mostly cloudy, with a low around 67. Thursday Partly sunny, with a high near 84. Thursday Night Mostly cloudy, with a low around 67. Friday Partly sunny, with a high near 85. Friday Night Partly cloudy, with a low around 68. Saturday Mostly sunny, with a high near 86. Saturday Night Mostly clear, with a low around 66.