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Climate · Arenal

Arenal in January

Warm and wet, as the days hold steady.

Typical weather, averaged over 30 years

January in Arenal is warm: highs near 81°F, lows near 67°F. Rain falls on about four days a week, less often as the month goes on, and daylight holds at about 11 hours 35 minutes.January in Arenal is warm: highs near 27°C, lows near 19°C. Rain falls on about four days a week, less often as the month goes on, and daylight holds at about 11 hours 35 minutes.

High
81°F27°Caverage
Low
67°F19°Caverage
Wet days
4a week · 59% of days
Daylight
11h 35mon average

Is January a good time to visit Arenal?

Yes. January is one of Arenal's best months (January to March).

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How January sits in the year

week by week

Temperature

Highs near 81°F in January, against 81°F to 87°F through the year.Highs near 27°C in January, against 27°C to 31°C through the year.

Chance of a wet day

59% of days in January, against 28% to 99% through the year.

Cloud cover

51% cover in January, against 51% to 83% through the year.

Daylight

11h 35m in January, against 11h 31m to 12h 44m through the year.

Week by week, lightly smoothed, with January shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. December81°27°low 68°low 20°5 wet days a weekRain on about five days a week.
  2. January81°27°low 67°low 19°4 wet days a weekRain on about four days a week.
  3. February82°28°low 67°low 19°3 wet days a weekRain on about three days a week.

Where Arenal sits, in January

America/Costa Rica
this place
typical high in January 40°F4°C95°F35°C
Sunrise, mid-January
6:00 AMsets 5:34 PM
Above the sea
410 mlow-lying
Latitude
10.5°Nnorthern hemisphere
Nearest of ours
Bijagua51 km north-west

The land around Arenal, shaded by its typical high in January, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Costa Rica in January

high · low · wet days
See January on the planning mapThe whole year in Arenal

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Arenal. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (410 m) against the climate model's (533 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (410 m) against the climate model's (533 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.