Adjuntas Weather in September
September in Adjuntas sees daytime temperatures around 27°C (81°F) and lows of 19°C (66°F) at night. As the wettest month of the year, keep in mind that rainfall is at its highest.
Rainfall in Adjuntas in September
Expect frequent, heavy rain this month, marking the peak rainfall period. A poncho will help protect you from getting soaked. You can typically expect 18 days of rain this month, averaging around 169 mm (6.7 in). Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Adjuntas in September
Temperatures in Adjuntas in September top out at 27°C (81°F) and drop to 19°C (66°F) overnight. This kind of day-to-night contrast is typical for this time of year. Nights drop to around 19°C (66°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.September in Adjuntas has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Adjuntas Temperature in September
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Adjuntas Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Adjuntas - and find the best time to visit.
Daily Historical Temperatures
48-year average (1977-2025)
Based on our historical records, temperatures in Adjuntas typically stay consistent throughout September, with daily highs averaging around 27°C (81°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Historical weather records for Adjuntas in September
Browse day-by-day weather records for Adjuntas spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Adjuntas historical weather extremes in September
Our historical data for Adjuntas spans 1999 to 2025, revealing these weather extremes.
- On September 3, 2024, temperatures climbed to 36°C (97°F), marking the warmest September day on record.
- On September 22, 2008, Adjuntas saw its coldest September day with temperatures maxing out at 26°C (79°F).
- The coldest night in September in Adjuntas was on September 27, 2025, with a minimum of 21°C (70°F).
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 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 Adjuntas in September
Warm but pleasant conditions in Adjuntas in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions.
What To Do in Adjuntas in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Adjuntas 3-Day Forecast
See the full Adjuntas 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) 
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