Climate · San Juan

San Juan in December

Hot and wet, as the days hold steady.

Typical weather, averaged over 30 years

December in San Juan is hot: highs near 86°F, lows near 72°F. Rain falls on about four days a week, and daylight holds at about 11 hours 3 minutes.December in San Juan is hot: highs near 30°C, lows near 22°C. Rain falls on about four days a week, and daylight holds at about 11 hours 3 minutes.

High
86°F30°Caverage
Low
72°F22°Caverage
Wet days
4a week · 51% of days
Daylight
11h 03mon average

Is December a good time to visit San Juan?


Yes. December is one of San Juan's most comfortable months (December 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 December sits in the year

week by week

Temperature

Highs near 86°F in December, against 85°F to 92°F through the year.Highs near 30°C in December, against 29°C to 33°C through the year.

Chance of a wet day

51% of days in December, against 35% to 80% through the year.

Cloud cover

35% cover in December, against 28% to 67% through the year.

Daylight

11h 03m in December, against 11h 03m to 13h 13m through the year.

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

Either side


  1. November87°31°low 74°low 23°5 wet days a weekRain on about five days a week.
  2. December86°30°low 72°low 22°4 wet days a weekRain on about four days a week.
  3. January85°29°low 71°low 22°3 wet days a weekRain on about three days a week.

Where San Juan sits, in December

America/Puerto Rico

this place
typical high in December 40°F4°C95°F35°C
Sunrise, mid-December
6:48 AMsets 5:50 PM
Above the sea
30 mlow-lying
Latitude
18.4°Nnorthern hemisphere
Nearest of ours
Dorado24 km west

The land around San Juan, shaded by its typical high in December, 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 Puerto Rico in December

high · low · wet days

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest San Juan. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. 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.