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

August 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
August, the last month of the summer, in Cayenne, is another tropical month, with average temperature varying between 31.6°C (88.9°F) and 22.4°C (72.3°F).

Temperature

In August, the average high-temperature is essentially the same as in July - a still tropical 31.6°C (88.9°F). In August, in Cayenne, the average low-temperature is 22.4°C (72.3°F).

Rainfall

In Cayenne, in August, it is raining for 14.2 days, with typically 143.6mm (5.7") of accumulated precipitation. 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.

Sea temperature

The month with the warmest seawater is August, with an average sea temperature of 28.7°C (83.7°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In August, the average length of the day in Cayenne is 12.3h.

Sunshine

The average sunshine in Cayenne is 7.4h.

UV index

January through June, August through November, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an extreme health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 12 transform into the following instructions:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in August in Cayenne?

In August, in Cayenne, French Guiana, the average high-temperature is 31.6°C (88.9°F), and the average low-temperature is 22.4°C (72.3°F).

How many days does it rain in August in Cayenne?

In Cayenne, French Guiana, in August, during 14.2 rainfall days, 143.6mm (5.7") of precipitation is typically accumulated.

When is the sea warmest in Cayenne?

August is the month with the warmest seawater in Cayenne, French Guiana, with an average sea temperature of 28.7°C (83.7°F).

What is the sea water temperature in August in Cayenne?

In August, the average sea temperature in Cayenne, French Guiana, is 28.7°C (83.7°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.

How many hours of daylight does Cayenne have in August?

The average length of the day in August in Cayenne is 12.3h.

How long on average sun shines in August in Cayenne?

In Cayenne, the average sunshine in August is 7.4h.

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

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

How high is the UV index in August in Cayenne?

In Cayenne, French Guiana, the average daily maximum UV index in August is 12. A UV Index reading of 11, and higher, represents an extreme health threat from the exposure to the Sun's UV radiation.
Average temperature in August - Cayenne, French Guiana
  • Average high temperature in August: 31.6°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 August: 22.4°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 August - Cayenne, French Guiana
  • Average rainfall in August: 143.6mm

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 August - Cayenne, French Guiana
  • Average rainfall days in August: 14.2 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 August - Cayenne, French Guiana
  • Average sea temperature in August: 28.7°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 August / Average sunshine in August - Cayenne, French Guiana
  • Average daylight in August: 12.3h

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

  • Average sunshine in August: 7.4h

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 August - Cayenne, French Guiana
  • Average UV index in August: 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).