ERA5 almanac comparison — 8 years of real data
Sea Island vs St. Martin: weather in June
Sea Island edges out St. Martin for sun in June: 24% clear historically versus 18% (8-year ERA5 average, a 6-point gap). Sea Island also sees measurably more rain than St. Martin this month (52% vs 34% of days). Both are viable — Sea Island is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific June. For this
week’s actual forecast, each destination links to its live page below.
Sea Island
GA
- Clear days, June
- 24%
- Sample size
- n=240 days
- Avg high
- 85°F
- Early June (1st–15th)
- 24%
- Late June (16th–end)
- 25%
- Rain frequency
- 52% of days
St. Martin
SX
- Clear days, June
- 18%
- Sample size
- n=240 days
- Avg high
- 79°F
- Early June (1st–15th)
- 17%
- Late June (16th–end)
- 18%
- Rain frequency
- 34% of days
Compare Sea 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.