ERA5 almanac comparison — 8 years of real data
Charleston vs Sea Island: weather in August
Charleston edges out Sea Island for sun in August: 12% clear historically versus 7% (8-year ERA5 average, a 5-point gap). Both are viable — Charleston is the safer bet.
Charleston
SC
- Clear days, August
- 12%
- Sample size
- n=248 days
- Avg high
- 85°F
- Early August (1st–15th)
- 11%
- Late August (16th–end)
- 12%
- Rain frequency
- 62% of days
Sea Island
GA
- Clear days, August
- 7%
- Sample size
- n=248 days
- Avg high
- 85°F
- Early August (1st–15th)
- 6%
- Late August (16th–end)
- 8%
- Rain frequency
- 66% of days
Frequently asked
Is Charleston or Sea Island warmer in August?
Equally warm by day in August. Charleston averages highs of 85°F (highs n=248 days); Sea Island averages highs of 85°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Charleston or Sea Island in August?
Days with measurable rain: Charleston 62%, Sea Island 66% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in August, Charleston or Sea Island?
Charleston edges out Sea Island for sun in August: 12% clear historically versus 7% (8-year ERA5 average, a 5-point gap). Both are viable — Charleston is the safer bet.
Compare Charleston vs Sea Island in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.