French Guiana weather

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The weather guide for French Guiana shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.

Which is the hottest month in French Guiana?

The hottest time of year in Cayenne, French Guiana is normally October. Expect maximum daytime temperatures to reach 32°C with very high heat and humidity.

Which month has the most rain in French Guiana?

In terms of rainfall, May is usually the wettest month in Cayenne, French Guiana with 544mm on average. There are normally 26 days in May with some rain.

When is it sunniest in French Guiana?

The sunniest time of year in Cayenne, French Guiana is normally October with bright sunshine on average for 70% of daylight hours; that's 8 hours of sunshine per day.

When is the sea warmest in French Guiana?

The sea is usually at its warmest in Cayenne, French Guiana in August when the water temperature reaches 28°C.

Metric (°C / mm)  |  Imperial (°F / inches)

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French Guiana weather overview

French Guiana is a small country in South America bordering Brazil and Suriname, with an Atlantic coastline at its northern edge. It consists largely of lowland plains with small hills to the south, and has an equatorial rainforest interior. Expect a climate of Turkish bath-style sultriness throughout the year, though conditions are at their most steamy during the rainy season, which stretches from December to mid-July.

Best time to visit is August and November, when conditions are driest and sunniest, and humidity not too oppressive.

What to pack for French Guiana weather

Take very light cotton clothing and reliable waterproofs if you are visiting in the long wet season. Add a wrap for cooler evenings.

Compare French Guiana weather with the USA

Below the French Guiana weather chart shows average maximum daytime temperature for French Guiana (Cayenne) and the USA (Washington).

Maximum daytime temperature (°C)

French Guiana (Cayenne)
USA (Washington)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C / mm)  |  Imperial (°F / inches)

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