Daytime highs, nighttime lows and the warmest cities across Puerto Rico this September.
Puerto Rico, experiences maximum daytime temperatures in September ranging from 27°C (81°F) in Adjuntas to 31°C (88°F) in Dorado. Nighttime temperatures generally drop to 25°C (77°F) in Dorado and 19°C (66°F) in Adjuntas.
Explore the map below to discover average September temperatures at the top destinations in Puerto Rico. For a deeper dive, simply click on any destination dot.
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Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Puerto Rico.
Marker color shows the average daytime high temperature in September: blue is cold, red is hot.
Drill down to September weather for any region in Puerto Rico.
Pick a city to see its September weather averages.
San Juan averages a daytime high of 31°C (88°F) in September, which is very high for Puerto Rico.
Nighttime temperatures in San Juan typically drop to around 25°C (77°F) in September.
Dorado tops the warmest city list in our database with average maximum daytime temperatures around 31°C (88°F) and a minimum nighttime temperature of around 25°C (77°F).
When looking through our records, we find that Adjuntas stands out as the coolest city in Puerto Rico for the month of September. Daytime highs average 27°C (81°F) and it cools down to about 19°C (66°F) at night.
San Juan enjoys approximately 236 hours of sunshine, offering a mostly sunny climate that adds a pleasant and vibrant feel to the month.
The water temperature averages approximately 29°C (84°F) in San Juan this month, which is a bit warm for swimming. For many people, water temperatures around 29°C (84°F) might feel quite warm, especially compared to typical swimming pool temperatures of 25°C (77°F) to 28°C (82°F).
We have much more information about the climate in Puerto Rico.
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