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Cabo Rojo Weather in September
September in Cabo Rojo brings very high temperatures, with highs of 30°C (86°F) and nights dropping to 26°C (79°F). It's the rainiest month of the year, so come prepared with waterproof gear.
Rainfall in Cabo Rojo in September
Since this is the rainiest month of the year, it's a good idea to carry an umbrella just in case. Analyzing past climate data, one can expect approximately 17 days of rain, averaging 117 mm (4.6 in). Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Cabo Rojo in September
Expect highs of 30°C (86°F) in Cabo Rojo in September, with nights dropping to around 26°C (79°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. Nights are warm at 26°C (79°F). It's worth making sure your accommodation has decent ventilation or air conditioning.September in Cabo Rojo has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Cabo Rojo Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
30°C (86°F)
Chance of Rain
55%
Precipitation
117 mm (4.6 in)
Rainy days
17 days
Cabo Rojo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Cabo Rojo - and find the best time to visit.
Daily Historical Temperatures
48-year average (1977-2025)
Based on our historical records, temperatures in Cabo Rojo typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Historical weather records for Cabo Rojo in September
Browse day-by-day weather records for Cabo Rojo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cabo Rojo historical weather extremes in September
Based on 26 years of weather observations in Cabo Rojo between 1999 and 2025, these are the recorded extremes.
- Cabo Rojo recorded its highest September temperature of 35°C (95°F) on September 29, 2013.
- The coldest September day was on September 18, 2004, with a maximum of 26°C (79°F).
- The lowest overnight temperature recorded in September was 20°C (68°F) (September 30, 2014).
Best Places in Puerto Rico in September
Find out more about the weather in Puerto Rico and which places have the best travel conditions in this month. See all of Puerto Rico in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Cabo Rojo in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho.
What To Do in Cabo Rojo in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Cabo Rojo 3-Day Forecast
More climate data for Cabo Rojo
See the full Cabo Rojo climate overview or explore weather in Puerto Rico.
Popular in September
Where to go in September - average daytime high across popular destinations.
San Juan
31°C (88°F) Fajardo30°C (86°F) Luquillo30°C (86°F) Aguada
30°C (86°F) Rincon
30°C (86°F) Rio Grande31°C (88°F) Culebra30°C (86°F) Vieques30°C (86°F) Bucket list
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