ERA5 almanac comparison — 8 years of real data
Costa Rica — Manuel Antonio vs San Antonio: weather in October
San Antonio is the clear winner for sun in October: 49% of days historically clear versus just 0% in Costa Rica — Manuel Antonio — a 49-point gap across 8 years of ERA5 data. Costa Rica — Manuel Antonio also sees measurably more rain than San Antonio this month (97% vs 26% of days). This isn't close.
Costa Rica — Manuel Antonio
CR
- Clear days, October
- 0%
- Sample size
- n=248 days
- Avg high
- 82°F
- Early October (1st–15th)
- 1%
- Late October (16th–end)
- 0%
- Rain frequency
- 97% of days
San Antonio
TX
- Clear days, October
- 49%
- Sample size
- n=248 days
- Avg high
- 84°F
- Early October (1st–15th)
- 58%
- Late October (16th–end)
- 40%
- Rain frequency
- 26% 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.