French Guiana weather in December 2025

Q: How hot is it in French Guiana in December?

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

Q: How sunny is it in French Guiana in December?

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

Q: How warm is the sea around French Guiana in December?

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

Q: Does it rain in French Guiana in December?

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

Expect daytime maximum temperatures of 30°C in 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
30°C max day temperature
5
5 hours of sunshine per day
18
18 days with some rainfall
23
23°C min night temperature
12
12 hours of daylight per day
H
High heat & humidity
294
294 mm of monthly rainfall
11
11 (Extreme) UV index
27
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)

How hot is it in French Guiana in December?

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

How sunny is it in French Guiana in December?

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

How warm is the sea around French Guiana in December?

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

Does it rain in French Guiana in December?

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

French Guiana December sunrise & sunset times

Browse the sunrise and sunset times for French Guiana in December 2025. Select a month to view French Guiana sunrise and sunset times for the next 12 months. The French Guiana sunrise and sunset times shown below are for Cayenne.

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