August · United States
Best time to visit Charleston in August Weather, crowds & prices
Weather in Charleston in August
Average temperature 28°C, 243 mm of rain, about 26 days with 6+ hours of sunshine and 81% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
4.0/10
Ranked #12 of 12 months
- Avg temp
- 28°C
- Rainfall
- 243 mm
- Humidity
- 81%
- Days with 6h+ sun
- 26
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
August in Charleston scores 4.0/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 28°C, 243 mm of rain, and roughly 26 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.
August in Charleston — off-season conditions
Days in August average 28°C (82°F) and humidity near 81% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
This is the year's wettest stretch at 243 mm, but with about 26 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 4/10 on the same scale — 12th of 12 months, versus 8.8/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, October is materially better in Charleston — 4.8 points higher on the same scale.
Frequently asked
- What is the weather like in Charleston in August?
- In August, Charleston averages 28°C, 243 mm of rain, and about 26 days with 6+ hours of sunshine. Its climate-comfort score is 4.0/10.
- Is August a good time to visit Charleston?
- August earns a 4.0/10 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 August?
- Expect about 243 mm of rain in August. Average humidity is 81% and there are about 26 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.