The climate in French Guiana

Average daytime and nighttime temperatures

All climatic diagrams of this page are taken from the collected data from 5 measuring stations in French Guiana.
All data correspond to the average monthly values of the last 20 years.

Back to overview: French Guiana

Climate zone: tropics

High humidity in French Guiana and high temperatures are causing a pleasant weather at times, but also and partly tropical hot and humid. It is yearlong warm or hot. Dued to the lesser rain the best time for traveling is from August to November. Most precipitation decrease from January to June.

Duration of daylight and sunshine in French Guiana

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/m³ (approx.)Absolute humidity in French Guiana

Temperature records of the last 71 years

The hottest temperature measured from 1950 to June 2021 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 71 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 71 years.

Long-term development of temperatures from 1991 - 2020

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 2020 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 26.5 °C in the last years before 2020. So over the past 30 years it has only increased by a minimal 0.4 °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: German Weather Service, individual values averaged and supplemented by own elements.
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