ERA5 almanac comparison — 8 years of real data
Barbados vs Puerto Rico: weather in May
Essentially a tie in May: Barbados is 11% clear historically, Puerto Rico is 7% clear (8-year ERA5 average) — within the noise. Avg high 83°F vs 87°F. Puerto Rico also sees measurably more rain than Barbados this month (62% vs 47% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Barbados
BB
- Clear days, May
- 11%
- Sample size
- n=248 days
- Avg high
- 83°F
- Early May (1st–15th)
- 14%
- Late May (16th–end)
- 9%
- Rain frequency
- 47% of days
Puerto Rico
PR
- Clear days, May
- 7%
- Sample size
- n=248 days
- Avg high
- 87°F
- Early May (1st–15th)
- 8%
- Late May (16th–end)
- 7%
- Rain frequency
- 62% of days
Compare Barbados vs Puerto Rico 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.