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SunnyDays

ERA5 almanac comparison — 8 years of real data

Amelia Island vs Vail: weather in September

Essentially a tie in September: Amelia Island is 22% clear historically, Vail is 23% clear (8-year ERA5 average) — within the noise. Avg high 84°F vs 70°F. Amelia Island also sees measurably more rain than Vail this month (62% vs 22% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.

What you are reading: 8-year historical averages, not a forecast. Either destination can still surprise you this specific September. For this week’s actual forecast, each destination links to its live page below.

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
See this week’s live forecast →

Vail

CO

Clear days, September
23%
Sample size
n=240 days
Avg high
70°F
Early September (1st–15th)
38%
Late September (16th–end)
8%
Rain frequency
22% of days

Compare Amelia Island vs Vail 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.