ERA5 almanac comparison — 8 years of real data
Palm Beach vs St. Martin: weather in May
Essentially a tie in May: Palm Beach is 20% clear historically, St. Martin is 24% clear (8-year ERA5 average) — within the noise. Avg high 84°F vs 78°F. Palm Beach also sees measurably more rain than St. Martin this month (55% vs 37% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Palm Beach
FL
- Clear days, May
- 20%
- Sample size
- n=248 days
- Avg high
- 84°F
- Early May (1st–15th)
- 26%
- Late May (16th–end)
- 15%
- Rain frequency
- 55% of days
St. Martin
SX
- Clear days, May
- 24%
- Sample size
- n=248 days
- Avg high
- 78°F
- Early May (1st–15th)
- 20%
- Late May (16th–end)
- 27%
- Rain frequency
- 37% of days
Compare Palm Beach 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.