ERA5 almanac comparison — 8 years of real data
Amelia Island vs Charleston: weather in September
Charleston edges out Amelia Island for sun in September: 32% clear historically versus 22% (8-year ERA5 average, a 10-point gap). Amelia Island also sees measurably more rain than Charleston this month (62% vs 46% of days). Both are viable — Charleston is the safer bet.
Amelia Island
FL
- Clear days, September
- 22%
- Sample size
- n=240 days
- Avg high
- 84°F
- Early September (1st–15th)
- 17%
- Late September (16th–end)
- 27%
- Rain frequency
- 62% of days
Charleston
SC
- Clear days, September
- 32%
- Sample size
- n=240 days
- Avg high
- 83°F
- Early September (1st–15th)
- 28%
- Late September (16th–end)
- 37%
- Rain frequency
- 46% of days
Frequently asked
Is Amelia Island or Charleston warmer in September?
Amelia Island runs warmer by day in September. Amelia Island averages highs of 84°F (highs n=240 days); Charleston averages highs of 83°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Amelia Island or Charleston in September?
Amelia Island is measurably wetter than Charleston. Days with measurable rain: Amelia Island 62%, Charleston 46% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Amelia Island or Charleston?
Charleston edges out Amelia Island for sun in September: 32% clear historically versus 22% (8-year ERA5 average, a 10-point gap). Amelia Island also sees measurably more rain than Charleston this month (62% vs 46% of days). Both are viable — Charleston is the safer bet.
Compare Amelia Island vs Charleston 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.