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The climate of French Guiana
French Guiana is officially an overseas department of France, through which it is the largest territory of the European Union outside Europe. French Guiana therefore has the French president for head of state and the official monetary unit in French Guyana is the euro. French Guiana has a tropical climate, with which the north-west has a tropical rainforest climate (type Af) with much precipitation throughout the year and the rest of the country has a tropical monsoon climate (type Am) because there is a distinct drier period and a long rainy season. The Marowijne river (called Maroni by the French) for the greater part forms the physical border between French Guiana and Suriname which is situated to the west. This river not only forms the border between both countries, but is also, due to the bad controllability, an important smuggling route from Suriname to French Guiana. Marowijne lies in an area where, on an average, falls an amount of thousands of millimeters of precipitation a year, through which the river regularly overflows its banks with all the misery in consequence of that. The region around Marowijne is on an average wetter than most parts of the Amazone region.


Climate information of places and areas in French Guiana
The climate information on this page is only brief. Specific information about weather and climate can be found on the climate pages per area or town. As for French Guiana the following climate information is available:


Tropical heat
The temperature in French Guiana is around the tropical value of thirty degrees practically throughout the year. In the dry season it is mostly somewhat warmer because the sun shines much more abundantly then and the air temperature can rise further than in the rainy season. At night the temperature does not drop until far after midnight to a minimum value of about 23-24 degrees Centigrade. In the highlands of the Toemoek-Hoemak mountains, in the extreme south of French Guiana, it can be somewhat cooler. Because the large amounts of precipitation and the high temperatures cause a very high relative air humidity it can feel very damp and sultry in French Guiana. This tropical dampness is present throughout the year.

Rainy season and hurricanes
In French Guiana ther is no immediate danger of hurricanes. These enormous tropical depressions develop between latitude 5 and 20 over the Atlantic and then travel on in western, north-western and later on often north or north-east direction. Due to the fact that French Guiana lies between latitude 2 and 6 it is just outside the route followed by the hurricanes. The rainy season in French Guiana is from December up to and including June. In July the average amount of precipitation fairly diminishes, just like the frequency of the showers. Large parts of French Guiana can be called relatively dry in the months of September and October.


Climate figures
Scattered over French Guiana you find different climate data and temperatures. The information in the table below applies to the capital of Cayenne and cannot be considered an average of the country. Visit the individual climate information pages for the climate data of other places in French Guiana.

temperature (°C)


temperature (°C)
hours of sunshine

average days with precipitation
per month
per month
temperature (°C)
January 29 23 4 21 27
February 29 23 4 17 27
March 29 23 5 22 27
April 30 24 5 22 28
May 29 23 4 27 28
June 30 23 5 24 28
July 31 23 7 19 28
August 32 22 8 10 28
September 32 23 8 5 28
October 32 23 8 5 28
November 31 23 7 11 28
December 30 23 5 18 27
= 0-5 mm ● = 6-30 mm ● = 31-60 mm ● = 61-100 mm ● = 101-200 mm ● = over 200 mm
= 0-0.2 inches ● = 0.2-1.2 inches ● = 1.2-2.4 inches ● = 2.5-4 inches ● = 4.1-8 inches ● = over 8 inches

More climate information
Climate figures come in handy, but they do not offer an over-all view of the climate and the possible weather circumstances in a particular period. How big the chance is of wintry weather, (extreme) heat or hurricanes cannot often be found again in figures. Therefore we offer monthly handy climate information. The information below applies to the capital of Cayenne. For information about specific areas and places in French Guiana you best visit the specific climate pages of those places and/or areas .

chance of
(very) hot


chance of
(very) cool
chance of

chance of
chance of
sunny days


click here for the explanation of the symbols


The information at this site was carefully composed from climate data collected by meteorological services, meteorological offices, climate experts and other sources. “More climate info” is based on statistics, climate data and personal experience. No rights can be derived from this site. Weather has no memory and gives no guaranties. Nothing is as changeable and unpredictable as the weather. The authors of this site feel in no way responsible for any damages caused by misinterpretation or other circumstances that may influence your holiday or trip to a certain destination. We provide information, it’s up to the reader to use it to it’s benefit.


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