ERA5 almanac comparison — 8 years of real data
Aruba vs St. Augustine: weather in September
Aruba edges out St. Augustine for sun in September: 32% clear historically versus 17% (8-year ERA5 average, a 15-point gap). St. Augustine also sees measurably more rain than Aruba this month (64% vs 27% of days). Both are viable — Aruba is the safer bet.
Aruba
Aruba
- Clear days, September
- 32%
- Sample size
- n=240 days
- Avg high
- 90°F
- Early September (1st–15th)
- 36%
- Late September (16th–end)
- 27%
- Rain frequency
- 27% of days
St. Augustine
FL
- Clear days, September
- 17%
- Sample size
- n=240 days
- Avg high
- 83°F
- Early September (1st–15th)
- 11%
- Late September (16th–end)
- 23%
- Rain frequency
- 64% of days
Frequently asked
Is Aruba or St. Augustine warmer in September?
Aruba runs warmer by day in September. Aruba averages highs of 90°F (highs n=240 days); St. Augustine averages highs of 83°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Aruba or St. Augustine in September?
St. Augustine is measurably wetter than Aruba. Days with measurable rain: Aruba 27%, St. Augustine 64% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Aruba or St. Augustine?
Aruba edges out St. Augustine for sun in September: 32% clear historically versus 17% (8-year ERA5 average, a 15-point gap). St. Augustine also sees measurably more rain than Aruba this month (64% vs 27% of days). Both are viable — Aruba is the safer bet.
Compare Aruba vs St. Augustine 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.