San German Weather in September
September in San German sees daytime temperatures around 31°C (88°F) and lows of 25°C (77°F) at night. As the wettest month of the year, keep in mind that rainfall is at its highest.
Rainfall in San German in September
As the month with the highest rainfall, make sure to have an umbrella to manage the showers. You can expect rain on roughly 17 days based on historical data, averaging 131 mm (5.2 in) for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in San German in September
Daytime temperatures in San German reach 31°C (88°F) in September, dropping to 25°C (77°F) at night. Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. With overnight lows of 25°C (77°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit San German. Our weather planner can help you explore destinations with more pleasant weather conditions.
San German Temperature in September
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San German Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San German - and find the best time to visit.
Daily Historical Temperatures
48-year average (1977-2025)
Based on our historical records, temperatures in San German typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Historical weather records for San German in September
Browse day-by-day weather records for San German spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San German historical weather extremes in September
Based on weather observations in San German between 1999 and 2025, these are the recorded extremes during September.
- On September 29, 2013, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 26°C (79°F), recorded on September 18, 2004.
- Nighttime temperatures dropped to 20°C (68°F) on September 30, 2014, marking the coldest September night on record.
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 San German 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 San German 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
San German 3-Day Forecast
See the full San German 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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