ERA5 almanac comparison — 8 years of real data
Charleston vs Memphis: weather in September
Memphis edges out Charleston for sun in September: 58% clear historically versus 32% (8-year ERA5 average, a 26-point gap). Charleston also sees measurably more rain than Memphis this month (46% vs 26% of days). Both are viable — Memphis is the safer bet.
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
Memphis
TN
- Clear days, September
- 58%
- Sample size
- n=240 days
- Avg high
- 85°F
- Early September (1st–15th)
- 57%
- Late September (16th–end)
- 60%
- Rain frequency
- 26% of days
Frequently asked
Is Charleston or Memphis warmer in September?
Memphis runs warmer by day in September. Charleston averages highs of 83°F (highs n=240 days); Memphis averages highs of 85°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Charleston or Memphis in September?
Charleston is measurably wetter than Memphis. Days with measurable rain: Charleston 46%, Memphis 26% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Charleston or Memphis?
Memphis edges out Charleston for sun in September: 58% clear historically versus 32% (8-year ERA5 average, a 26-point gap). Charleston also sees measurably more rain than Memphis this month (46% vs 26% of days). Both are viable — Memphis is the safer bet.
Compare Charleston vs Memphis 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.