Cayenne weather in December 2025

Expect daytime maximum temperatures of 30°C in Cayenne, French Guiana in December and high heat and humidity based on long-term weather averages. There are 5 hours of sunshine per day on average with 18 days with some rainfall and typically 294 mm of rainfall in the month.

  • 30°C maximum daytime temperature in December in Cayenne30
    30°C max day temperature
  • 5 hours of sunshine per day
  • 18 days with some rainfall in December in Cayenne18
    18 days with some rainfall
  • 23°C minimum night-time temperature in December in Cayenne23
    23°C min night temperature
  • 12 hours of daylight per day in December in Cayenne12
    12 hours of daylight per day
  • High heat & humidity in December in CayenneH
    High heat & humidity
  • 294 mm monthly rainfall in December in Cayenne294
    294 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in December in Cayenne11
    11 (Extreme) UV index
  • 27°C sea temperature in December in Cayenne27
    27°C sea temperature

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The December 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Cayenne in December?

Daytime temperatures usually reach 30°C in Cayenne in December with high heat and humidity, falling to 23°C at night.

How sunny is it in Cayenne in December?

There are normally 5 hours of bright sunshine each day in Cayenne in December - that's 45% of daylight hours.

How warm is the sea around Cayenne in December?

The average sea temperature around Cayenne in December is 27°C.

Does it rain in Cayenne in December?

There are usually 18 days with some rain in Cayenne in December and the average monthly rainfall is 294mm.

Cayenne December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 06:23 18:14
Tuesday, 16th December 2025 06:30 18:20
Wednesday, 31st December 2025 06:37 18:28

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