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Charleston in September: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Charleston in September is climatically well suited to beach holidays and family holidays. The average daily high is around 29 °C, and the sea is about 27 °C. With about 14 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
68/100 · #5
Warmth
#4
Dryness
#9
Sun
#6
Sea warmth
#3
Published best categories: Beach, Family
Charleston · SeptemberPhoto: Something Original ( talk ) · CC BY-SA 3.0Climate facts
- Average high
- 29 °C
- Average low
- 21 °C
- Sea
- 27 °C
- Rainy days (est.)
- 14 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 80 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 32 | 24 | 21 | 173 | 6.8 | 79 | 1.1 | 28 | 51 |
| September (selected) | 29 | 21 | 14 | 128 | 5.9 | 80 | 1.3 | 27 | 68 |
| October | 25 | 15 | 9 | 101 | 5.0 | 79 | 1.3 | 24 | 85 |
How do the previous and next months compare?
Baseline: September (68/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | -17 | +2.5 °C | +2.8 °C | +6.9 | +44.7 mm | +0.9 h | -0.8 % | -0.2 m/s | +1.3 °C |
| October | +17 | -4.2 °C | -5.7 °C | -4.9 | -27.3 mm | -0.9 h | -1.2 % | ±0 m/s | -3.3 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Charleston in September?
The average daily high is around 29 °C, with an average daily low of about 21 °C.
Can you swim in Charleston in September?
The sea is about 27 °C (very warm).
Does it rain a lot in Charleston in September?
The curated estimate is about 14 rainy days per month, not a directly measured long-term average. Total precipitation averages around 128 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Charleston?
By the climate score, April, May, October and November are the strongest months for Charleston. For a beach trip: May, June, September and October. September is not among them.