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SunnyDays

ERA5 almanac comparison — 8 years of real data

Costa Rica — Manuel Antonio vs Jamaica: weather in January

Costa Rica — Manuel Antonio edges out Jamaica for sun in January: 37% clear historically versus 23% (8-year ERA5 average, a 14-point gap). Jamaica also sees measurably more rain than Costa Rica — Manuel Antonio this month (42% vs 27% of days). 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

Jamaica

JM

Clear days, January
23%
Sample size
n=248 days
Avg high
81°F
Early January (1st–15th)
23%
Late January (16th–end)
23%
Rain frequency
42% of days

Compare Costa Rica — Manuel Antonio vs Jamaica 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.