September · United States
Best time to visit Charleston in September Weather, crowds & prices
Weather in Charleston in September
Average temperature 25°C, 141 mm of rain, about 17 days with 6+ hours of sunshine and 82% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
5.6/10
Ranked #9 of 12 months
- Avg temp
- 25°C
- Rainfall
- 141 mm
- Humidity
- 82%
- Days with 6h+ sun
- 17
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Charleston scores 5.6/10 for sightseeing and cultural travel - ranked #9 of 12. Expect around 25°C, 141 mm of rain, and roughly 17 days with 6+ hours of sunshine this month.
Charleston's peninsula holds the French Quarter, Rainbow Row, and the Battery, where the Ashley and Cooper rivers meet the harbor.
September in Charleston — workable with trade-offs
At 25°C (76°F) this is comfortable city weather in September, with sightseeing easiest before lunch and after the afternoon peak.
141 mm of rain signals a properly wet month, with only about 17 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 5.6/10 on the same scale — 9th of 12 months, versus 8.8/10 for the best month here.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella.
Budget for low-season pricing, and crowds are light for this destination.
If your dates are flexible, October is materially better in Charleston — 3.2 points higher on the same scale.
Frequently asked
- What is the weather like in Charleston in September?
- In September, Charleston averages 25°C, 141 mm of rain, and about 17 days with 6+ hours of sunshine. Its climate-comfort score is 5.6/10.
- Is September a good time to visit Charleston?
- September earns a 5.6/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Charleston in September?
- Expect about 141 mm of rain in September. Average humidity is 82% and there are about 17 days with 6+ hours of sunshine.
Curated in Charleston
Tickets & experiences
Things to do in Charleston
Charleston, United States. Live activities and tours from GetYourGuide, matched to this destination.