‹ South Carolina weather by month
South Carolina weather in September
The state broadly agrees with itself in September: afternoons run 86° in Hilton Head Island and 83° in Charleston, with everywhere else in between.
Based on 3 weather stations. Three stations, all on the water — inland South Carolina and the upstate around Greenville run hotter in summer and colder on winter nights than any row here.
Charleston & the Lowcountry
Highs 83–86°, nights 70–73°, and 4.0–5.3 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Charleston | 83° / 73° | 6 | The tropics are awake, and the crowds have gone home. |
| Hilton Head Island | 86° / 70° | 6 | Summer without the summer people — but watch the forecast. |
The Grand Strand
Highs near 83°, nights around 68°, and 6.7 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Myrtle Beach | 83° / 68° | 6 | Everything you wanted from July, minus the people. |
Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.