ERA5 almanac comparison — 8 years of real data
Costa Rica — Manuel Antonio vs San Antonio: weather in January
Costa Rica — Manuel Antonio edges out San Antonio for sun in January: 37% clear historically versus 10% (8-year ERA5 average, a 27-point gap). Both are viable — Costa Rica — Manuel Antonio is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific January. For this
week’s actual forecast, each destination links to its live page below.
Costa Rica — Manuel Antonio
CR
- Clear days, January
- 37%
- Sample size
- n=248 days
- Avg high
- 84°F
- Early January (1st–15th)
- 24%
- Late January (16th–end)
- 50%
- Rain frequency
- 27% of days
San Antonio
TX
- Clear days, January
- 10%
- Sample size
- n=248 days
- Avg high
- 64°F
- Early January (1st–15th)
- 15%
- Late January (16th–end)
- 5%
- 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.