ERA5 almanac comparison — 8 years of real data
Jacksonville vs Miami: weather in September
Jacksonville edges out Miami for sun in September: 22% clear historically versus 4% (8-year ERA5 average, a 18-point gap). Miami also sees measurably more rain than Jacksonville this month (80% vs 58% of days). Both are viable — Jacksonville is the safer bet.
Jacksonville
FL
- Clear days, September
- 22%
- Sample size
- n=240 days
- Avg high
- 86°F
- Early September (1st–15th)
- 17%
- Late September (16th–end)
- 27%
- Rain frequency
- 58% 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 Jacksonville or Miami warmer in September?
Equally warm by day in September. Jacksonville 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 Jacksonville or Miami in September?
Miami is measurably wetter than Jacksonville. Days with measurable rain: Jacksonville 58%, Miami 80% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Jacksonville or Miami?
Jacksonville edges out Miami for sun in September: 22% clear historically versus 4% (8-year ERA5 average, a 18-point gap). Miami also sees measurably more rain than Jacksonville this month (80% vs 58% of days). Both are viable — Jacksonville is the safer bet.
Compare Jacksonville 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.