ERA5 almanac comparison — 8 years of real data
Costa Rica — Guanacaste vs Sea Island: weather in November
Essentially a tie in November: Costa Rica — Guanacaste is 18% clear historically, Sea Island is 17% clear (8-year ERA5 average) — within the noise. Avg high 86°F vs 70°F. Costa Rica — Guanacaste also sees measurably more rain than Sea Island this month (62% vs 28% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Costa Rica — Guanacaste
Costa Rica
- 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
Sea Island
GA
- Clear days, November
- 17%
- Sample size
- n=240 days
- Avg high
- 70°F
- Early November (1st–15th)
- 22%
- Late November (16th–end)
- 12%
- Rain frequency
- 28% of days
Frequently asked
Is Costa Rica — Guanacaste or Sea Island warmer in November?
Costa Rica — Guanacaste runs warmer by day in November. Costa Rica — Guanacaste averages highs of 86°F (highs n=240 days); Sea Island averages highs of 70°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Costa Rica — Guanacaste or Sea Island in November?
Costa Rica — Guanacaste is measurably wetter than Sea Island. Days with measurable rain: Costa Rica — Guanacaste 62%, Sea Island 28% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in November, Costa Rica — Guanacaste or Sea Island?
Essentially a tie in November: Costa Rica — Guanacaste is 18% clear historically, Sea Island is 17% clear (8-year ERA5 average) — within the noise. Avg high 86°F vs 70°F. Costa Rica — Guanacaste also sees measurably more rain than Sea Island this month (62% vs 28% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare Costa Rica — Guanacaste vs Sea Island 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 forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.