Monthly weather forecast and climate
Cayenne, French Guiana

Palm trees in a botanical garden in Cayenne, French Guiana, overlooking green fields under clear skies
Palm trees in a botanical garden in Cayenne, French Guiana, overlooking green fields under clear skies

What is the coldest month in Cayenne?

With an average high-temperature of 29.1°C (84.4°F) and an average low-temperature of 23.3°C (73.9°F), January is the coldest month.

How many days does it rain in Cayenne?

In Cayenne, French Guiana, during the entire year, the rain falls for 221.1 days and collects up to 3516.3mm (138.4") of precipitation.

When is the sea coldest in Cayenne?

February is the month with the coldest seawater in Cayenne, with an average sea temperature of 27.3°C (81.1°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the rainiest month in Cayenne?

May is the month with the most rainfall. Rain falls for 26.4 days and accumulates 579.4mm (22.8") of precipitation.

What month is the sea warmest in Cayenne?

With an average sea temperature of 28.7°C (83.7°F), August is the month with the warmest seawater in Cayenne, French Guiana. For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the driest month in Cayenne?

September is the month with the least rainfall in Cayenne. Rain falls for 7.1 days and accumulates 55.7mm (2.2") of precipitation.

What is the warmest month in Cayenne?

October is the warmest month, with an average high-temperature of 32.2°C (90°F) and an average low-temperature of 22.3°C (72.1°F).
Average temperature - Cayenne, French Guiana
Average rainfall - Cayenne, French Guiana

The wettest month (with the highest rainfall) is May (579.4mm).
The driest month (with the lowest rainfall) is September (55.7mm).

Average rainfall days - Cayenne, French Guiana

The month with the highest number of rainy days is May (26.4 days).
The month with the lowest number of rainy days is September (7.1 days).

Average sea temperature - Cayenne, French Guiana

The best month for swimming (with the highest average sea temperature) is August (28.7°C).
The coldest month (with the lowest average sea temperature) is February (27.3°C).

Average daylight / Average sunshine - Cayenne, French Guiana

Months with the longest days are June and July (Average daylight: 12.4h).
The month with shortest days is December (Average daylight: 11.8h).

The month with most sunshine is September (Average sunshine: 8.5h).
The month with least sunshine is January (Average sunshine: 3h).

Average UV index - Cayenne, French Guiana

Months with the highest UV index are January, February, March, April, May, June, August, September, October and November (UV index 12).
Months with the lowest UV index are July and December (UV index 11).

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