Cayenne
French Guiana
Long-term weather forecast
Long-term weather forecast

May 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
May, the last month of the spring, in Cayenne, is another warm month, with average temperature ranging between min 23.5°C (74.3°F) and max 29.9°C (85.8°F).

Temperature

In May, the average high-temperature remains equal as in April - a still warm 29.9°C (85.8°F). In Cayenne, the average low-temperature is 23.5°C (74.3°F).

Rainfall

The month with the most rainfall is May when the rain falls for 26.4 days and typically aggregates up to 579.4mm (22.81") of precipitation.

Sea temperature

In May, the average sea temperature in Cayenne is 28.3°C (82.9°F).
Note: 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.

Daylight

Months with the longest days are May through July, with an average of 12.4h of daylight.

Sunshine

The average sunshine in May is 3.8h.

UV index

Months with the highest UV index in Cayenne, French Guiana, are January through June, August through November, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 12 interpret into the following advice:
Take all required precautions, as unprotected skin and eyes can burn in minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in May in Cayenne?

In Cayenne, in May, the average high-temperature is 29.9°C (85.8°F), and the average low-temperature is 23.5°C (74.3°F).

How many days does it rain in May in Cayenne?

In Cayenne, French Guiana, in May, it is raining for 26.4 days, with typically 579.4mm (22.81") of accumulated precipitation.

What is the rainiest month in Cayenne?

May is the month with the most rainfall in Cayenne. Rain falls for 26.4 days and accumulates 579.4mm (22.81") of precipitation.

What is the sea water temperature in May in Cayenne?

In May, the average sea temperature in Cayenne is 28.3°C (82.9°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.

When are the longest days in Cayenne?

Months with the longest days in Cayenne are May through July, with an average of 12.4h of daylight.

What is the average length of the day in May in Cayenne?

In May, the average length of the day is 12.4h.

How many hours of sunshine does Cayenne have in May?

In Cayenne, French Guiana, the average sunshine in May is 3.8h.

What is the month with the highest UV index in Cayenne?

Months with the highest UV index are January through June, August through November, with an average maximum UV index of 12.

What is the UV index intensity in May in Cayenne?

In Cayenne, the average daily maximum UV index in May is 12. A UV Index estimate of 11, and higher, represents an ultimate hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in May - Cayenne, French Guiana
  • Average high temperature in May: 29.9°C

The warmest month (with the highest average high temperature) is October (32.2°C).
The month with the lowest average high temperature is January (29.1°C).

  • Average low temperature in May: 23.5°C

The month with the highest average low temperature is April (23.7°C).
The coldest month (with the lowest average low temperature) is September (22.2°C).

Average rainfall in May - Cayenne, French Guiana
  • Average rainfall in May: 579.4mm

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 in May - Cayenne, French Guiana
  • Average rainfall days in May: 26.4 days

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 in May - Cayenne, French Guiana
  • Average sea temperature in May: 28.3°C

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 in May / Average sunshine in May - Cayenne, French Guiana
  • Average daylight in May: 12.4h

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

  • Average sunshine in May: 3.8h

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

Average UV index in May - Cayenne, French Guiana
  • Average UV index in May: 12

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).