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Puerto Rico weather in September 2025
Expect daytime maximum temperatures of 86°F in Puerto Rico in September and high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 18 days with some rainfall and typically 7.4 inches of rainfall in the month.
- 86°F max day temperature
86 - 8 hours of sunshine per day
- 18 days with some rainfall
18 - 73°F min night temperature
73 - 12 hours of daylight per day
12 - High heat & humidity
H - 7.4 inches of monthly rainfall
7.4 - 11+ (Extreme) UV index
11 - 84°F sea temperature
84
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The September weather guide for Puerto Rico (San Juan) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Top Puerto Rico destinations
Below are average maximum temperatures at popular countries, regions and places in Puerto Rico in September. Select a holiday destination to see more weather parameters.
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Metric (°C) | Imperial (°F)
More about Puerto Rico
How hot is it in Puerto Rico in September?
Daytime temperatures usually reach 86°F in San Juan, Puerto Rico in September with high heat and humidity, falling to 73°F at night.
How sunny is it in Puerto Rico in September?
There are normally 8 hours of bright sunshine each day in San Juan, Puerto Rico in September - that's 64% of daylight hours.
How warm is the sea around Puerto Rico in September?
The average sea temperature around San Juan, Puerto Rico in September is 84°F.
Does it rain in Puerto Rico in September?
There are usually 18 days with some rain in San Juan, Puerto Rico in September and the average monthly rainfall is 7.4 inches.
What is the chance of a hurricane in Puerto Rico in September?
On average 1.1 days in September in San Juan, Puerto Rico are likely to be affected by the passage of one or more tropical storms.
Puerto Rico September sunrise & sunset times
Browse the sunrise and sunset times for Puerto Rico in September 2025. Select a month to view Puerto Rico sunrise and sunset times for the next 12 months. The Puerto Rico sunrise and sunset times shown below are for San Juan.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 06:10 | 18:38 |
| Monday, 15th September 2025 | 06:12 | 18:26 |
| Tuesday, 30th September 2025 | 06:15 | 18:13 |
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