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

January 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
January, the same as December, is another warm winter month in Cayenne, French Guiana, with average temperature fluctuating between 29.1°C (84.4°F) and 23.3°C (73.9°F).

Temperature

The coldest month is January, with an average high-temperature of 29.1°C (84.4°F) and an average low-temperature of 23.3°C (73.9°F).

Rainfall

In Cayenne, French Guiana, in January, during 23.6 rainfall days, 451.2mm (17.8") of precipitation is typically accumulated. Throughout the year, in Cayenne, there are 221.1 rainfall days, and 3516.3mm (138.4") of precipitation is accumulated.

Sea temperature

In January, the average sea temperature is 27.6°C (81.7°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In January, the average length of the day in Cayenne is 11.9h.

Sunshine

With an average of 3h of sunshine, January has the least sunshine of the year.

UV index

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 value of 11, and more, symbolizes an ultimate health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 12 transform into the following instructions:
Practice all essential precautions. Protection against sun damage is crucial. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the coldest month in Cayenne?

The coldest month in Cayenne, French Guiana, is January, with an average high-temperature of 29.1°C (84.4°F) and an average low-temperature of 23.3°C (73.9°F).

What is the temperature in January in Cayenne?

In January, in Cayenne, the average high-temperature is 29.1°C (84.4°F), and the average low-temperature is 23.3°C (73.9°F).

How much does it rain in Cayenne in January?

In Cayenne, in January, during 23.6 rainfall days, 451.2mm (17.8") of precipitation is typically accumulated.

How warm is the water in January in Cayenne?

In January, the average sea temperature in Cayenne is 27.6°C (81.7°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

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

In Cayenne, the average length of the day in January is 11.9h.

What is the month with the least sunshine in Cayenne?

January has the least sunshine of the year in Cayenne, French Guiana, with an average of 3h of sunshine.

How long on average sun shines in January in Cayenne?

In Cayenne, French Guiana, the average sunshine in January is 3h.

What are the months 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 January in Cayenne?

In January, 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 unsafe exposure to the Sun's UV rays.
Average temperature in January - Cayenne, French Guiana
  • Average high temperature in January: 29.1°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 January: 23.3°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 January - Cayenne, French Guiana
  • Average rainfall in January: 451.2mm

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 January - Cayenne, French Guiana
  • Average rainfall days in January: 23.6 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 January - Cayenne, French Guiana
  • Average sea temperature in January: 27.6°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 January / Average sunshine in January - Cayenne, French Guiana
  • Average daylight in January: 11.9h

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 January: 3h

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