Cayenne weather in September 2025

Expect daytime maximum temperatures of 90°F in Cayenne, French Guiana in September and very high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 1.6 inches of rainfall in the month.

  • 90°F maximum daytime temperature in September in Cayenne90
    90°F max day temperature
  • 8 hours of sunshine per day
  • 4 days with some rainfall in September in Cayenne4
    4 days with some rainfall
  • 73°F minimum night-time temperature in September in Cayenne73
    73°F min night temperature
  • 12 hours of daylight per day in September in Cayenne12
    12 hours of daylight per day
  • Very high heat & humidity in September in CayenneVH
    Very High heat & humidity
  • 1.6 inches monthly rainfall in September in Cayenne1.6
    1.6 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Cayenne11
    11+ (Extreme) UV index
  • 82°F sea temperature in September in Cayenne82
    82°F sea temperature

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The September weather guide for French Guiana, represented by Cayenne, (Cayenne) 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)  |  Imperial (°F)

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How hot is it in Cayenne in September?

Daytime temperatures usually reach 90°F in Cayenne in September with very high heat and humidity, falling to 73°F at night.

How sunny is it in Cayenne in September?

There are normally 8 hours of bright sunshine each day in Cayenne in September - that's 68% of daylight hours.

How warm is the sea around Cayenne in September?

The average sea temperature around Cayenne in September is 82°F.

Does it rain in Cayenne in September?

There are usually 4 days with some rain in Cayenne in September and the average monthly rainfall is 1.6 inches.

Cayenne September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:23 18:35
Monday, 15th September 2025 06:20 18:29
Tuesday, 30th September 2025 06:17 18:21

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