ERA5 almanac comparison — 8 years of real data
Cayman Islands vs Hilton Head: weather in April
Hilton Head edges out Cayman Islands for sun in April: 38% clear historically versus 10% (8-year ERA5 average, a 28-point gap). Cayman Islands also sees measurably more rain than Hilton Head this month (58% vs 28% of days). Both are viable — Hilton Head is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific April. For this
week’s actual forecast, each destination links to its live page below.
Cayman Islands
KY
- Clear days, April
- 10%
- Sample size
- n=240 days
- Avg high
- 84°F
- Early April (1st–15th)
- 15%
- Late April (16th–end)
- 5%
- Rain frequency
- 58% of days
Hilton Head
SC
- Clear days, April
- 38%
- Sample size
- n=240 days
- Avg high
- 74°F
- Early April (1st–15th)
- 31%
- Late April (16th–end)
- 44%
- Rain frequency
- 28% 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.