September Weather in Puerto Rico

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The tables below give the normal September 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 measures of climate are averages of historical data collected at weather stations over several decades.

One site, Pico Del Este, is much cooler and rainier 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 September temperatures in Puerto Rico
High °F Low °F Place High °C Low °C
92 71 Arecibo 33 21
84 68 Cayey 29 20
87 73 Dorado 31 23
89 74 Fajardo 32 23
89 76 Guayama 32 25
88 72 Isabela 31 22
88 73 Manati 31 23
81 67 Maricao 27 19
91 71 Mayagüez 33 22
91 73 Mona Island 33 23
72 64 Pico Del Este 22 18
91 73 Ponce 33 23
90 72 Rincón 32 22
89 78 San Juan 32 25
93 68 San Sebastián 34 20
90 66 Utuado 32 19

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

Rainfall

Average total precipitation in September. Days are when it rains at least 0.01 inches (0.25 millimetres).
Days Place Inches Millimetres
12 Arecibo   5.1 130
16 Cayey   9.0 228
14 Dorado   5.9 151
17 Fajardo   6.8 174
15 Guayama   6.9 176
16 Isabela   6.5 166
14 Manati   5.7 145
  – Maricao 11.6 296
17 Mayagüez   8.7 221
12 Mona Island   5.1 129
27 Pico Del Este 14.8 376
12 Ponce   6.4 162
  – Rincón   8.1 205
17 San Juan   5.8 147
17 Utuado   8.4 214

Relative Humidity at San Juan, Puerto Rico in September averages 79 percent in the morning and 67 percent in the afternoon.

Hurricanes and Tropical Storms

September is the height of hurricane and tropical storm activity for Puerto Rico. All areas of the country could be affected by severe weather.

Overall, the chance of a tropical storm or hurricane getting within 100 miles (165 kilometres) of Puerto Rico this month is 20 percent. There's an eight percent chance of a hurricane and a 1 to 2 percent chance of a major hurricane.

References

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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

NOAA. National Weather Service. National Hurricane Center.

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Average Weather

Puerto Rico
Temperature & Rainfall

WEATHER AVERAGES
Weather Extremes