ERA5 almanac comparison — 8 years of real data
Costa Rica — Guanacaste vs St. Barthélemy: weather in November
Essentially a tie in November: Costa Rica — Guanacaste is 18% clear historically, St. Barthélemy is 19% clear (8-year ERA5 average) — within the noise. Avg high 86°F vs 82°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific November. For this
week’s actual forecast, each destination links to its live page below.
Costa Rica — Guanacaste
CR
- Clear days, November
- 18%
- Sample size
- n=240 days
- Avg high
- 86°F
- Early November (1st–15th)
- 10%
- Late November (16th–end)
- 25%
- Rain frequency
- 62% of days
St. Barthélemy
BL
- Clear days, November
- 19%
- Sample size
- n=240 days
- Avg high
- 82°F
- Early November (1st–15th)
- 12%
- Late November (16th–end)
- 26%
- Rain frequency
- 50% of days
Compare Costa Rica — Guanacaste vs St. Barthélemy 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.