August weather forecast
Cayenne, French Guiana

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Palm trees in a botanical garden in Cayenne, French Guiana
Palm trees in a botanical garden in Cayenne, French Guiana

Weather in August

In August, Cayenne, French Guiana, steps further into the realm of the dry season. The usually rainfall-rich climate observes exceptional changes. Clear skies, reduced thunderstorms, and increased sunshine hours bring more cheerful outdoors experiences. However, the sea temperature stays consistent, keeping water activities enjoyable. A continued diminution of rainfall to a mere 144mm (5.67") in August affirmatively declares the dominance of the dry season.

Temperature

August in Cayenne begins with an average high-temperature of a still hot 31.6°C (88.9°F), reflecting close similarity to the preceding month. In the month of August, the nighttime temperature dips to a steady average of 22.4°C (72.3°F).

Rainfall

In August, the rain falls for 14.2 days. Throughout August, 144mm (5.67") of precipitation is accumulated. Throughout the year, there are 221.1 rainfall days, and 3516mm (138.43") of precipitation is accumulated.

Sea temperature

August is the month with the warmest seawater, with an average sea temperature of 28.7°C (83.7°F).
Note: For swimming, diving, or other water activities, temperatures from 25°C (77°F) to 29°C (84.2°F) provide the most enjoyable experience for extended periods without discomfort.

Daylight

In Cayenne, the average length of the day in August is 12h and 16min.
On the first day of the month, sunrise is at 06:25 and sunset at 18:45. On the last day of August, in Cayenne, French Guiana, sunrise is at 06:23 and sunset at 18:35 -03.

Sunshine

In August, 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 in Cayenne. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index of 12 during August translates into these guidelines:
Carry out all important precautions, unprotected skin could get burns in no time. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Frequent application of a broad-spectrum SPF 30+ sunscreen is crucial, reapply it every two hours or immediately post swimming or outdoor exercise. Stay vigilant! UV rays get a boost in intensity due to sand and water reflections.

Frequently asked questions

How hot is August in Cayenne?

The high-temperature, in August, in Cayenne, records 31.6°C (88.9°F), while the low-temperature is 22.4°C (72.3°F).

How much does it rain in Cayenne in August?

In August, the rain falls for 14.2 days. Throughout August, 144mm (5.67") of precipitation is accumulated.

When 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.

What is the sea water temperature in August in Cayenne?

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

How many hours of daylight does Cayenne have in August?

In August, the average day length in Cayenne is 12h and 16min.

When are sunrise and sunset in August in Cayenne?

On the first day of August in Cayenne, sunrise is at 06:25 and sunset at 18:45. On the last day of the month, sunrise is at 06:23 and sunset at 18:35 -03.

How long on average sun shines in August in Cayenne?

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

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

The 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.

How high is the UV index in August in Cayenne?

The average daily maximum UV index in August is 12. A UV Index of 11, and more, symbolizes an extreme health threat from exposure to Sun's UV rays.

Average temperature in August
Cayenne, French Guiana

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 - 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 least rainfall) is September (55.7mm).

Average rainfall days in August
Cayenne, French Guiana

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 least rainy days is September (7.1 days).

Average sea temperature in August
Cayenne, French Guiana

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 / Average sunshine in August - Cayenne, French Guiana
  • Average daylight in August: 12h and 2min

The month with the longest days is June (Average daylight: 12h and 24min).
The month with the shortest days is December (Average daylight: 11h and 48min).

  • Average sunshine in August: 7h and 2min

The month with the most sunshine is September (Average sunshine: 8h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average UV index in August
Cayenne, French Guiana

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

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

Cayenne, French Guiana

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