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Charleston in August: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Charleston in August is climatically mixed. The average daily high is around 32 °C, and the sea is about 28 °C. With about 21 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
51/100 · #10
Warmth
#2
Dryness
#11
Sun
#5
Sea warmth
#1
Published best categories: none
Charleston · AugustPhoto: Something Original ( talk ) · CC BY-SA 3.0Climate facts
- Average high
- 32 °C
- Average low
- 24 °C
- Sea
- 28 °C
- Rainy days (est.)
- 21 rainy days (est.)
- Sun (est.)
- 7 h/day
- Humidity
- 79 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| July | 32 | 24 | 21 | 153 | 7.7 | 77 | 1.2 | 28 | 49 |
| August (selected) | 32 | 24 | 21 | 173 | 6.8 | 79 | 1.1 | 28 | 51 |
| September | 29 | 21 | 14 | 128 | 5.9 | 80 | 1.3 | 27 | 68 |
How do the previous and next months compare?
Baseline: August (51/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| July | -2 | +0.8 °C | +0.6 °C | +0.6 | -19.6 mm | +0.9 h | -2.1 % | +0.1 m/s | -0.1 °C |
| September | +17 | -2.5 °C | -2.8 °C | -6.9 | -44.7 mm | -0.9 h | +0.8 % | +0.2 m/s | -1.3 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Charleston in August?
The average daily high is around 32 °C, with an average daily low of about 24 °C.
Can you swim in Charleston in August?
The sea is about 28 °C (very warm).
Does it rain a lot in Charleston in August?
The curated estimate is about 21 rainy days per month, not a directly measured long-term average. Total precipitation averages around 173 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. August is not among them.