Charleston, South Carolina – Thunderstorms are set to roll into Charleston by Monday afternoon, bringing oppressive heat, heavy rain, and travel delays along I-26.
According to the National Weather Service, showers and thunderstorms are expected after 2 p.m. Monday, July 21st, with a high near 94°F and a heat index up to 112°F. Winds will shift from southwest to west at 6–10 mph, with gusts as high as 20 mph. Rainfall amounts could exceed a quarter inch during storms, and flash flooding in low-lying areas is possible.
Localized downpours and lightning may cause delays on U.S. 17 and I-526 during the Monday evening commute. Residents should limit outdoor activity during peak heat and ensure electronic devices are fully charged in case of isolated outages. Keep an eye on storm drains, especially in flood-prone neighborhoods like West Ashley and Mount Pleasant.
Storms may persist into Monday night, with a 40% chance of continued thunderstorm activity. On Tuesday, storms intensify with an 80% chance of showers and thunderstorms between 2 p.m. and 5 p.m., followed by more storms overnight into early Wednesday.
Looking ahead, here’s your five-day summer forecast for Charleston:
- Monday, July 21: High 94°F | PM storms likely | Heat Index 112°F
- Tuesday, July 22: High 89°F | Thunderstorms 80% | Risk of flash flooding
- Wednesday, July 23: High 86°F | Showers/storms before 2 p.m.
- Thursday, July 24: High 86°F | Isolated PM storms
- Friday, July 25: High 89°F | Mostly dry with stray storms possible
- Saturday, July 26: High 92°F | Afternoon showers likely | Humid weekend returns
Heat advisories may return midweek — stay alert for more updates and avoid non-essential travel during storms.
