ERA5 almanac comparison — 8 years of real data
Costa Rica — Guanacaste vs Sea Island: weather in June
Sea Island edges out Costa Rica — Guanacaste for sun in June: 24% clear historically versus 5% (8-year ERA5 average, a 19-point gap). Costa Rica — Guanacaste also sees measurably more rain than Sea Island this month (88% vs 52% of days). Both are viable — Sea Island is the safer bet.
Costa Rica — Guanacaste
Costa Rica
- Clear days, June
- 5%
- Sample size
- n=240 days
- Avg high
- 87°F
- Early June (1st–15th)
- 1%
- Late June (16th–end)
- 9%
- Rain frequency
- 88% of days
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
Frequently asked
Is Costa Rica — Guanacaste or Sea Island warmer in June?
Costa Rica — Guanacaste runs warmer by day in June. Costa Rica — Guanacaste averages highs of 87°F (highs n=240 days); Sea Island averages highs of 85°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 June?
Costa Rica — Guanacaste is measurably wetter than Sea Island. Days with measurable rain: Costa Rica — Guanacaste 88%, Sea Island 52% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in June, Costa Rica — Guanacaste or Sea Island?
Sea Island edges out Costa Rica — Guanacaste for sun in June: 24% clear historically versus 5% (8-year ERA5 average, a 19-point gap). Costa Rica — Guanacaste also sees measurably more rain than Sea Island this month (88% vs 52% of days). Both are viable — Sea Island is the safer bet.
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.