The climate in French Guiana

Average daytime and nighttime temperatures

All climate diagrams on this page result from the collected data of 5 weather stations.
All data correspond to the average monthly values of the last 20 years.
Back to overview: French Guiana
Climate zone: tropics
High humidity and hot temperatures make the weather in French Guiana at times pleasant but also tropical humid. It is yearlong warm or hot. Dued to the lesser rain the best time for traveling is from August to November. Most precipitation falls from January to June.
Duration of daylight and sunshine in French Guiana
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in French Guiana
Rainy days per monthRainy days per month in French Guiana
Precipitation in mm/dayPrecipitation in French Guiana
Relative humidity in %Relative humidity in French Guiana
Absolute humidity in g/m³Absolute humidity in French Guiana

Temperature records of the last 72 years

The hottest temperature measured from 1950 to September 2022 was reported by the Saint Laurent Du Maroni weather station. In September 2016 the record temperature of 38.0 °C was reported here. The hottest summer from July to September, based on all 4 weather stations in French Guiana , was recorded in 1998 with an average temperature of 27.0 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 26.4 degrees Celsius. The average maximum daily temperature at that time was 32.6 °C.
The coldest day in these 72 years was reported by the weather station Cayenne Matoury. Here the temperature dropped to 18.6 °C in January 2020. Cayenne Matoury lies at an altitude of 9 meters above sea level. The coldest winter (January to March) was in 1971 with an average temperature of 24.8 °C. In French Guiana, it is usual to have about 1.0 degrees more at 25.8 °C for this three-month period.
The most precipitation fell in May 1984. With 32.9 mm per day, the Cayenne Matoury weather station recorded the highest monthly average of the last 72 years.

Long-term development of temperatures from 1991 - 2021

In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 1 measuring points in order to have actually comparable data over as long a period as possible.
In the years 1991 to 2021 there were only these 1 weather stations in the whole country, which reported continuous temperature values (Cayenne Matoury). From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was October 2004 with 27.7 °C. January 2000 was the coldest month with an average temperature of 24.9 °C.
The average annual temperature was about 26.1 °C in the years after 1991 and about 26.4 °C in the last years before 2021. So over the past 31 years it has only increased by a minimal 0.3 °C. This trend only applies to the selected 1 weather stations in French Guiana. A considerably more comprehensive evaluation of the global warming has been provided separately.
Long-term development of temperatures in French Guiana

Data basis and methodology

The data of the individual measuring stations are based on the archives of the German Weather Service, individual values averaged and supplemented by own elements. In order to determine a representative national average, average values were first calculated for each part of the country, which were then summarized at the national level.
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