ERA5 almanac comparison — 8 years of real data
Amelia Island vs St. Martin: weather in July
Essentially a tie in July: Amelia Island is 10% clear historically, St. Martin is 11% clear (8-year ERA5 average) — within the noise. Avg high 88°F vs 80°F. Amelia Island also sees measurably more rain than St. Martin this month (73% vs 49% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Amelia Island
FL
- Clear days, July
- 10%
- Sample size
- n=248 days
- Avg high
- 88°F
- Early July (1st–15th)
- 7%
- Late July (16th–end)
- 13%
- Rain frequency
- 73% of days
St. Martin
SX
- Clear days, July
- 11%
- Sample size
- n=248 days
- Avg high
- 80°F
- Early July (1st–15th)
- 15%
- Late July (16th–end)
- 7%
- Rain frequency
- 49% of days
Compare Amelia Island vs St. Martin 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 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.