September 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 September

September in Cayenne, French Guiana, is synonymous with the driest month. Though temperatures remain consistent, the reduced rainfall significantly changes the city's vibes. People enjoy more outdoor activities as sunshine hours peak and rainfall drops to its annual minimum. September graces the month with a scarce 56mm (2.2") of rainfall, marking its classification as the driest month.

Temperature

In Cayenne, September's average high-temperature stands at a still hot 32.1°C (89.8°F), closely related to the preceding month. During September, the temperature is averaged to a low of 22.2°C (72°F) at night.

Rainfall

September is the month with the least rainfall. Rain falls for 7.1 days and accumulates 56mm (2.2") of precipitation.

Sea temperature

In Cayenne, French Guiana, the average seawater temperature in September is 28.5°C (83.3°F).
Note: Water temperatures ranging between 25°C (77°F) and 29°C (84.2°F) are regarded as very warm, making swimming, diving, and similar water activities pleasurable for extended periods.

Daylight

In Cayenne, the average length of the day in September is 12h and 8min.
On the first day of September, sunrise is at 06:22 and sunset at 18:35. On the last day of the month, sunrise is at 06:16 and sunset at 18:21 -03.

Sunshine

With an average of 8.5h of sunshine, September has the most sunshine of the year in Cayenne, French Guiana.

UV index

The months with the highest UV index are January through June, August through November, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 12 in September converts into the following recommendations:
Adopt every vital precaution, unprotected skin and eyes may burn rapidly. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Directly after swimming or an outdoor workout, generously apply and reapply a broad-spectrum SPF 30+ sunscreen. Be on guard! The reflective nature of sand and water boosts UV exposure.

Frequently asked questions

How hot is it in Cayenne in September?

The average high-temperature, in September, in Cayenne, is 32.1°C (89.8°F), while the average low-temperature is 22.2°C (72°F).

What is the driest month in Cayenne?

September is the month with the least rainfall in Cayenne, French Guiana. Rain falls for 7.1 days and accumulates 56mm (2.2") of precipitation.

How many days does it rain in September in Cayenne?

In Cayenne, in September, during 7.1 rainfall days, 56mm (2.2") of precipitation is typically accumulated.

What is the water temperature in September in Cayenne?

In September, the average sea temperature is 28.5°C (83.3°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 September?

The average day length in September in Cayenne is 12h and 8min.

What time are sunrise and sunset in September in Cayenne?

In September, on the first day of the month, sunrise is at 06:22 and sunset at 18:35. On the last day of the month, sunrise is at 06:16 and sunset at 18:21 -03.

What month has the most sunshine in Cayenne?

With an average of 8.5h of sunshine, September has the most sunshine of the year in Cayenne, French Guiana.

How many hours of sunshine does Cayenne have in September?

In September, the average sunshine duration is 8.5h.

When is 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 September in Cayenne?

In September, the average daily maximum UV index in Cayenne, French Guiana, is 12. A UV Index estimate of 11, and higher, represents an extreme health threat from exposure to the Sun's UV radiation.

Average temperature in September
Cayenne, French Guiana

Average temperature in September - Cayenne, French Guiana
  • Average high temperature in September: 32.1°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 September: 22.2°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 September
Cayenne, French Guiana

Average rainfall in September - Cayenne, French Guiana
  • Average rainfall in September: 55.7mm

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 September
Cayenne, French Guiana

Average rainfall days in September - Cayenne, French Guiana
  • Average rainfall days in September: 7.1 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 September
Cayenne, French Guiana

Average sea temperature in September - Cayenne, French Guiana
  • Average sea temperature in September: 28.5°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 September /
Average sunshine in September
Cayenne, French Guiana

Average daylight in September / Average sunshine in September - Cayenne, French Guiana
  • Average daylight in September: 12h and 1min

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 September: 8h and 3min

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 September
Cayenne, French Guiana

Average UV index in September - Cayenne, French Guiana
  • Average UV index in September: 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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