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SunnyDays

ERA5 almanac comparison — 8 years of real data

Aruba vs Costa Rica — Guanacaste: weather in April

Essentially a tie in April: Aruba is 33% clear historically, Costa Rica — Guanacaste is 33% clear (8-year ERA5 average) — within the noise. Avg high 86°F vs 96°F. Costa Rica — Guanacaste also sees measurably more rain than Aruba this month (40% vs 24% of days). 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 April. For this week’s actual forecast, each destination links to its live page below.

Aruba

AW

Clear days, April
33%
Sample size
n=240 days
Avg high
86°F
Early April (1st–15th)
40%
Late April (16th–end)
26%
Rain frequency
24% of days

Costa Rica — Guanacaste

CR

Clear days, April
33%
Sample size
n=240 days
Avg high
96°F
Early April (1st–15th)
42%
Late April (16th–end)
24%
Rain frequency
40% of days

Compare Aruba vs Costa Rica — Guanacaste 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.