ERA5 almanac comparison — 8 years of real data
Amelia Island vs Tulum: weather in September
Amelia Island edges out Tulum for sun in September: 22% clear historically versus 4% (8-year ERA5 average, a 18-point gap). Both are viable — Amelia Island 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
Tulum
Mexico
- Clear days, September
- 4%
- Sample size
- n=240 days
- Avg high
- 88°F
- Early September (1st–15th)
- 5%
- Late September (16th–end)
- 3%
- Rain frequency
- 72% of days
Frequently asked
Is Amelia Island or Tulum warmer in September?
Tulum runs warmer by day in September. Amelia Island averages highs of 84°F (highs n=240 days); Tulum averages highs of 88°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Amelia Island or Tulum in September?
Days with measurable rain: Amelia Island 62%, Tulum 72% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Amelia Island or Tulum?
Amelia Island edges out Tulum for sun in September: 22% clear historically versus 4% (8-year ERA5 average, a 18-point gap). Both are viable — Amelia Island is the safer bet.
Compare Amelia Island vs Tulum 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.