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Climate · San Juan

San Juan in August

Hot and wet, as the days shorten.

Typical weather, averaged over 30 years

August in San Juan is hot: highs near 92°F, lows near 77°F. Rain falls on about five days a week, and the days shorten by 26 minutes from the first week to the last.August in San Juan is hot: highs near 33°C, lows near 25°C. Rain falls on about five days a week, and the days shorten by 26 minutes from the first week to the last.

High
92°F33°Caverage
Low
77°F25°Caverage
Wet days
5a week · 72% of days
Daylight
12h 43mon average

Is August a good time to visit San Juan?

August sits outside San Juan's most comfortable months, which run from December to March. Expect hot days and rain on about five days a week.

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 August sits in the year

week by week

Temperature

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

Chance of a wet day

72% of days in August, against 35% to 80% through the year.

Cloud cover

62% cover in August, against 28% to 67% through the year.

Daylight

12h 43m in August, against 11h 03m to 13h 13m through the year.

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

Either side

  1. July92°33°low 76°low 24°4 wet days a weekRain on about four days a week.
  2. August92°33°low 77°low 25°5 wet days a weekRain on about five days a week.
  3. September91°33°low 76°low 24°6 wet days a weekRain on about six days a week.

Where San Juan sits, in August

America/Puerto Rico
this place
typical high in August 40°F4°C95°F35°C
Sunrise, mid-August
6:06 AMsets 6:52 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 August, 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 August

high · low · wet days
See August on the planning mapThe whole year in San Juan

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.