ERA5 almanac comparison — 8 years of real data
Birmingham vs Miami: weather in September
Birmingham is the clear winner for sun in September: 49% of days historically clear versus just 4% in Miami — a 45-point gap across 8 years of ERA5 data. Miami also sees measurably more rain than Birmingham this month (80% vs 31% of days). This isn't close.
Birmingham
AL
- Clear days, September
- 49%
- Sample size
- n=240 days
- Avg high
- 86°F
- Early September (1st–15th)
- 44%
- Late September (16th–end)
- 54%
- Rain frequency
- 31% of days
Miami
FL
- Clear days, September
- 4%
- Sample size
- n=240 days
- Avg high
- 86°F
- Early September (1st–15th)
- 5%
- Late September (16th–end)
- 4%
- Rain frequency
- 80% of days
Frequently asked
Is Birmingham or Miami warmer in September?
Equally warm by day in September. Birmingham averages highs of 86°F (highs n=240 days); Miami averages highs of 86°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Birmingham or Miami in September?
Miami is measurably wetter than Birmingham. Days with measurable rain: Birmingham 31%, Miami 80% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Birmingham or Miami?
Birmingham is the clear winner for sun in September: 49% of days historically clear versus just 4% in Miami — a 45-point gap across 8 years of ERA5 data. Miami also sees measurably more rain than Birmingham this month (80% vs 31% of days). This isn't close.
Compare Birmingham vs Miami 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.