Cayo Guillermo weather in September 2025

Expect 32°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Cayo Guillermo in September. Check more long-term weather averages for Cayo Guillermo in September before you book your next holiday to Cuba in 2025/2026.

  • 32°C maximum daytime temperature in September in Cayo Guillermo32
    32°C max day temperature
  • 7 hours of sunshine per day
  • 15 days with some rainfall in September in Cayo Guillermo15
    15 days with some rainfall
  • 22°C minimum night-time temperature in September in Cayo Guillermo22
    22°C min night temperature
  • 12 hours of daylight per day in September in Cayo Guillermo12
    12 hours of daylight per day
  • Very high heat & humidity in September in Cayo GuillermoVH
    Very High heat & humidity
  • 160 mm monthly rainfall in September in Cayo Guillermo160
    160 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in September in Cayo Guillermo11
    11 (Extreme) UV index
  • 29°C sea temperature in September in Cayo Guillermo29
    29°C sea temperature

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Cayo Guillermo by month

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The September weather guide for Cuba (Cayo Guillermo) 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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How hot is it in Cayo Guillermo in September?

Daytime temperatures usually reach 32°C in Cayo Guillermo in September with very high heat and humidity, falling to 22°C at night.

How sunny is it in Cayo Guillermo in September?

There are normally 7 hours of bright sunshine each day in Cayo Guillermo in September - that's 57% of daylight hours.

How warm is the sea around Cayo Guillermo in September?

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

Does it rain in Cayo Guillermo in September?

There are usually 15 days with some rain in Cayo Guillermo in September and the average monthly rainfall is 160mm.

What is the chance of a hurricane in Cayo Guillermo in September?

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

Cayo Guillermo September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:57 18:31
Monday, 15th September 2025 06:01 18:18
Tuesday, 30th September 2025 06:06 18:03

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