ERA5 almanac comparison — 8 years of real data
Costa Rica — Guanacaste vs Puerto Vallarta: weather in April
Puerto Vallarta is the clear winner for sun in April: 99% of days historically clear versus just 33% in Costa Rica — Guanacaste — a 66-point gap across 8 years of ERA5 data. Costa Rica — Guanacaste also sees measurably more rain than Puerto Vallarta this month (40% vs 0% of days). This isn't close.
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
Puerto Vallarta
MX
- Clear days, April
- 99%
- Sample size
- n=240 days
- Avg high
- 81°F
- Early April (1st–15th)
- 100%
- Late April (16th–end)
- 98%
- Rain frequency
- 0% of days
Compare Costa Rica — Guanacaste vs Puerto Vallarta 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.