Arroyo weather in September 2025

Expect 31°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Arroyo in September. Check more long-term weather averages for Arroyo in September before you book your next holiday to Puerto Rico in 2025/2026.

  • 31°C maximum daytime temperature in September in Arroyo31
    31°C max day temperature
  • 8 hours of sunshine per day
  • 17 days with some rainfall in September in Arroyo17
    17 days with some rainfall
  • 24°C minimum night-time temperature in September in Arroyo24
    24°C min night temperature
  • 12 hours of daylight per day in September in Arroyo12
    12 hours of daylight per day
  • Very high heat & humidity in September in ArroyoVH
    Very High heat & humidity
  • 181 mm monthly rainfall in September in Arroyo181
    181 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Arroyo11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Arroyo29
    29°C sea temperature

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The September weather guide for Puerto Rico (Arroyo) 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.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Puerto Rico

How hot is it in Arroyo in September?

Daytime temperatures usually reach 31°C in Arroyo in September with very high heat and humidity, falling to 24°C at night.

How sunny is it in Arroyo in September?

There are normally 8 hours of bright sunshine each day in Arroyo in September - that's 64% of daylight hours.

How warm is the sea around Arroyo in September?

The average sea temperature around Arroyo in September is 29°C.

Does it rain in Arroyo in September?

There are usually 17 days with some rain in Arroyo in September and the average monthly rainfall is 181mm.

What is the chance of a hurricane in Arroyo in September?

On average 1 day in September in Arroyo is likely to be affected by the passage of one or more tropical storms.

Arroyo September sunrise & sunset times

Browse the sunrise and sunset times for Arroyo in September 2025. Select a month to view Arroyo sunrise and sunset times for the next 12 months.

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 06:14 18:13

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