May weather forecast
Cayenne, French Guiana

Sheltering under an umbrella becomes a common sight as May clocks the highest rainfall for the year in Cayenne, French Guiana. It brings the wet season to its peak with intense rainy spells, although the temperature remains uniformly warm. Venturing out in the water remains a pleasant experience thanks to the unchanged sea temperature. Indoor activities become popular during this phase, allowing the city's indoor tourism to thrive. The whopping 579mm (22.8") of rainfall makes May the wettest month, imprinted in the memory of locals and tourist for its significant downpours.

Temperature

May's weather in Cayenne, recording an average high temperature of a still warm 29.9°C (85.8°F), matches that of April. Cayenne witnesses an average low-temperature of 23.5°C (74.3°F) throughout the month of May.

Rainfall

May is the month with the most rainfall in Cayenne. Rain falls for 26.4 days and accumulates 579mm (22.8") of precipitation.

Sea temperature

In May, the average sea temperature is 28.3°C (82.9°F).
Note: Swimming, diving, and other water activities in the temperature range of 25°C (77°F) to 29°C (84.2°F) are perceived as very enjoyable and comfortable for prolonged durations.

Daylight

In Cayenne, the average length of the day in May is 12h and 21min.
On the first day of May, sunrise is at 06:17 and sunset at 18:35. On the last day of the month, sunrise is at 06:15 and sunset at 18:38 -03.

Sunshine

The average sunshine in May is 3.8h.

UV index

The months with the highest UV index in Cayenne are January through June, August through November, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In May, the maximum UV index of 12 transforms into these recommendations:
Put into effect every essential safeguard, as unprotected skin and eyes might burn instantly. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Even if the day is cloudy, sunscreen with SPF of at least 30 should be applied generously and reapplied often, particularly after swimming or outdoor exercise. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.