French Guiana weather in May 2025

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

Daytime temperatures usually reach 29°C in Cayenne, French Guiana in May with high heat and humidity, falling to 23°C at night.

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

There are normally 4 hours of bright sunshine each day in Cayenne, French Guiana in May - that's 36% of daylight hours.

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

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

Q: Does it rain in French Guiana in May?

There are usually 26 days with some rain in Cayenne, French Guiana in May and the average monthly rainfall is 544mm.

Expect 84°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in French Guiana in May. Check more long-term weather averages for French Guiana in May before you book your next holiday to French Guiana in 2025/2026.

84
84°F max day temperature
4
4 hours of sunshine per day
26
26 days with some rainfall
73
73°F min night temperature
12
12 hours of daylight per day
H
High heat & humidity
21.4
21.4 inches of monthly rainfall
11
11+ (Extreme) UV index
81
81°F sea temperature

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The May 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)

How hot is it in French Guiana in May?

Daytime temperatures usually reach 84°F in Cayenne, French Guiana in May with high heat and humidity, falling to 73°F at night.

How sunny is it in French Guiana in May?

There are normally 4 hours of bright sunshine each day in Cayenne, French Guiana in May - that's 36% of daylight hours.

How warm is the sea around French Guiana in May?

The average sea temperature around Cayenne, French Guiana in May is 81°F.

Does it rain in French Guiana in May?

There are usually 26 days with some rain in Cayenne, French Guiana in May and the average monthly rainfall is 21.4 inches.

French Guiana May sunrise & sunset times

Browse the sunrise and sunset times for French Guiana in May 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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