August Weather in Puerto Rico





The tables below give the normal August temperatures and rainfall for cities and popular vacation spots in Puerto Rico. There's also information here on hurricanes, plus this month's average humidity and ocean temperature.

The temperature and rain measurements are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

One site, Pico Del Este, is much cooler than others on the list. That's because it's a high mountain peak, at 3448 feet (1050 metres) elevation, in the El Yunque Caribbean National Forest.

Temperature

Average August temperatures in Puerto Rico
High °F Low °F Place High °C Low °C
89 73 Aguirre 31 23
82 68 Aibonito 28 20
91 71 Caguas 33 21
89 78 Ceiba 32 25
88 74 Dorado 31 23
90 77 Guayama 32 25
87 73 Isabela 30 23
89 72 Juncos 31 22
91 76 La Parguera 33 24
92 70 Lajas 33 21
89 76 Levittown 31 25
87 72 Manati 31 22
80 68 Maricao 27 20
90 72 Mayagüez 32 22
93 73 Mona Island 34 23
71 64 Pico Del Este 22 18
92 69 Ponce 33 21
89 78 San Juan 32 25

Ocean Temperature at San Juan, Puerto Rico averages 83 degrees Fahrenheit (28 degrees Celsius) in August.

Rainfall

Average total precipitation in August. Days are when it rains at least 0.01 inches (0.25 millimetres).
Days Place Inches Milli­metres
10 Aguirre 5.3 134
14 Aibonito 5.5 141
19 Caguas 8.2 209
18 Ceiba 4.3 110
14 Dorado 6.3 161
19 Guayama 7.1 180
16 Isabela 6.7 171
17 Juncos 7.2 183
La Parguera 4.3 110
12 Lajas 4.9 124
Levittown 7.7 196
15 Manati 5.4 136
Maricao 11.6 296
15 Mayagüez 6.8 173
11 Mona Island 4.2 107
10 Ponce 4.6 116
20 San Juan 6.3 160

Relative Humidity at San Juan, Puerto Rico in August averages 80 percent in the morning and 67 percent in the afternoon.

Hurricanes and Tropical Storms

With hurricane season in full swing, there's about a two percent chance of a hurricane approaching Puerto Rico in August. The likelihood of a named tropical coming within 100 miles (165 kilometres) of land is 12 percent for most of Puerto Rico and 14 percent in the southeast.

References

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

National Oceanographic Data Center. NODC Coastal Water Temperature Guide (CWTG).

NOAA. National Weather Service. National Hurricane Center.

Puerto Rico
Temperature & Rainfall
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