Discover French Guiana
Very few tourists make it to this small South American country. It's a shame, because nature in French Guiana is still pure and unspoiled.
Cayenne Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Cayenne.
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Climate overview of Cayenne
Cayenne, French Guiana, has a stable climate with little temperature variation across the year. Average daytime temperatures hover around 31°C (88°F), peaking in October at 33°C (91°F) and dipping in January to 29°C (84°F).
With around 2663 mm (105 in) of annual rainfall, Cayenne has a notably wet climate. However, this rainfall is not evenly distributed, the city has a distinct rainy season from December to July. The wettest month is May. October is the sunniest month, averaging 8.5 hours of sunshine per day.
Cayenne Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Cayenne - and find the best time to visit.
Monthly Temperature in Cayenne
With minimal seasonal shifts, Cayenne experiences a constant climate year-round. Average daytime temperatures reach a very warm 33°C (91°F) in October. In January, the coolest month of the year, temperatures drop to a comfortable 29°C (84°F).
At night, temperatures range from around 24°C (75°F) in October to 23°C (73°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Cayenne
Cayenne has a notably wet climate with abundant precipitation, recording 2663 mm (105 in) of rainfall per year. Cayenne can be quite wet during May, receiving approximately 403 mm (16 in) of precipitation over 26 rainy days.
In contrast, during the driest month (September), you will experience much drier conditions, with 65 mm (2.6 in) of precipitation spread across 5 rainy days. For more details, please visit our Cayenne Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Cayenne
Cayenne can be enjoyed more throughout the sunniest month of October under a blue sky, with approximately 8.5 hours of sunshine daily. In contrast, the city experiences much darker days in February, with only 3.1 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Water Temperature in Cayenne
The mean water temperature over the year ranges from 27°C (81°F) in January to 28°C (82°F) in March.
Water temperature over the year
Humidity in Cayenne by Month
The relative humidity is high throughout the year in Cayenne.
The city experiences its highest humidity in May, reaching 85%. In September, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Cayenne
The average wind speed over the year ranges from 2 m/s (4 knots) to 4 m/s (8 knots). It is lower in June and July and higher in March. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Cayenne
The most favourable weather available in Cayenne usually occurs in September. Conditions are generally most challenging in March, April, May, June, July and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
mixed
Feb
mixed
Mar
wet
Apr
very wet
May
very wet
Jun
very wet
Jul
very wet
Aug
mixed
Sep
good
Oct
mixed
Nov
mixed
Dec
very wet
- Best overall: September
- Warmest weather: August, September, October and November
- Most sunshine: September and October
- Fewest rainy days: September and October
- Best for swimming: Any time of year. The sea stays pleasantly warm year-round.
- Wettest months: April, May, June and July, when rainfall is highest.
- Seasonal pattern: A distinct rainy season from December to July
Frequently asked questions about the climate in Cayenne
What is the best time to visit Cayenne?
September typically offers the most optimal weather in Cayenne. In contrast, March, April, May, June, July and December tend to have less optimal conditions. Cayenne has a distinct rainy season from December to July.
What temperatures can I expect in Cayenne?
Daytime highs range from 29°C (84°F) in January to 33°C (91°F) in October. Nighttime lows range from 23°C (73°F) to 24°C (75°F). Temperatures stay relatively stable year-round.
How much rain does Cayenne get?
Annual rainfall is around 2663 mm (105 in). May is the wettest month with 403 mm (16 in), while September is the driest with 65 mm (2.6 in).
How sunny is Cayenne?
Cayenne receives around 2,024 hours of sunshine per year. October is the sunniest month with 256 hours, while February is the cloudiest with just 93 hours. Overall, Cayenne enjoys abundant sunshine.
Cayenne 3-Day Forecast
Cayenne on the map
Cayenne is highlighted - select any city to see its climate.
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