ERA5 almanac comparison — 8 years of real data
Costa Rica — Manuel Antonio vs San Antonio: weather in August
San Antonio is the clear winner for sun in August: 45% of days historically clear versus just 3% in Costa Rica — Manuel Antonio — a 42-point gap across 8 years of ERA5 data. Costa Rica — Manuel Antonio also sees measurably more rain than San Antonio this month (88% vs 24% of days). This isn't close.
Costa Rica — Manuel Antonio
CR
- Clear days, August
- 3%
- Sample size
- n=248 days
- Avg high
- 82°F
- Early August (1st–15th)
- 3%
- Late August (16th–end)
- 3%
- Rain frequency
- 88% of days
San Antonio
TX
- Clear days, August
- 45%
- Sample size
- n=248 days
- Avg high
- 97°F
- Early August (1st–15th)
- 51%
- Late August (16th–end)
- 39%
- Rain frequency
- 24% of days
Compare Costa Rica — Manuel Antonio vs San Antonio 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.