ERA5 almanac comparison — 8 years of real data
Cayman Islands vs Hilton Head: weather in November
Essentially a tie in November: Cayman Islands is 12% clear historically, Hilton Head is 12% clear (8-year ERA5 average) — within the noise. Avg high 84°F vs 68°F. Cayman Islands also sees measurably more rain than Hilton Head this month (60% vs 31% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Cayman Islands
KY
- Clear days, November
- 12%
- Sample size
- n=240 days
- Avg high
- 84°F
- Early November (1st–15th)
- 5%
- Late November (16th–end)
- 19%
- Rain frequency
- 60% of days
Hilton Head
SC
- Clear days, November
- 12%
- Sample size
- n=240 days
- Avg high
- 68°F
- Early November (1st–15th)
- 18%
- Late November (16th–end)
- 7%
- Rain frequency
- 31% of days
Compare Cayman Islands vs Hilton Head 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.