December weather forecast
French Guiana

December in French Guiana is characterized by a continuation of the greater rainy season. In Cayenne, the coastal capital city, the average rainfall is about 300mm (11.81"), a further increase from November's levels. The number of rainy days also rises, with an average of approximately 20 days experiencing rainfall throughout the month.

Inland regions such as Saint-Laurent-du-Maroni similarly experience high levels of rainfall during December, reflective of the pervasive influence of the greater rainy season across the entire country. The consistently high precipitation indicates the peak of the rainy season, resulting in damp and humid conditions nationwide.

Despite the heightened rainfall, temperatures in December continue to remain consistent, echoing the pattern seen throughout the year. Nighttime lows typically hover around 23°C (73.4°F), while daytime highs reach approximately 29°C (84.2°F). The persistently warm temperatures, even amidst the intensifying rainy season, further demonstrate the enduring warmth of French Guiana's tropical climate.

Sunlight in December is somewhat limited, with coastal areas receiving an average of about 5 hours of sunshine per day. The frequency of overcast days remains high due to the increased cloud cover accompanying the rainy season.

For those planning to visit French Guiana in December, they should prepare for high rainfall, consistent high temperatures, and reduced sunlight. The intensity of the rainy season makes this month less suitable for outdoor activities, though it provides an opportunity to experience the raw, tropical weather of French Guiana at its most vibrant.

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• Cayenne - December »
  The month with the shortest days in Cayenne is December, with an average of 11h and 48min of daylight. In Cayenne during December, the rain falls for 21.6 days and regularly aggregates up to 341mm (13.43") of precipitation.
• Kourou - December »
  The month with the shortest days in Kourou is December, with an average of 11h and 48min of daylight. In Kourou in December, the average water temperature is 27.8°C (82°F).
• Remire-Montjoly - December »
  On the last day of December, in Remire-Montjoly sunrise is at 06:37 and sunset at 18:27 -03. The month with the shortest days in Remire-Montjoly is December, with an average of 11h and 48min of daylight.
• Maripasoula - December »
  In Maripasoula, French Guiana, during December, the rain falls for 26.2 days and regularly aggregates up to 112mm (4.41") of precipitation. The month with the shortest days in Maripasoula, French Guiana, is December, with an average of 11h and 54min of daylight.
• Mana - December »
  December has the shortest days of the year in Mana, French Guiana, with an average of 11h and 48min of daylight. In Mana in December, the average water temperature is 27.7°C (81.9°F).
• Apatou - December »
  In Apatou during December, the rain falls for 21.9 days and regularly aggregates up to 84mm (3.31") of precipitation. December, wrapping up the year in Apatou ushers more rainfall, higher than the previous month of November.
• Grand-Santi - December »
  With an average maximum UV index of 5, December is the month with the lowest UV index in Grand-Santi, French Guiana. In Grand-Santi the average relative humidity in December is 86%.
• Camopi - December »
  In Camopi in December, it is raining for 25.1 days, with typically 146mm (5.75") of accumulated precipitation. January through July, November and December, with an average maximum UV index of 6, are months with the lowest UV index in Camopi, French Guiana.
• Iracoubo - December »
  December has the shortest days of the year in Iracoubo with an average of 11h and 48min of daylight. In Iracoubo, in December, during 26 rainfall days, 227mm (8.94") of precipitation is typically accumulated.
• Saul - December »
  With an average of 11h and 54min of daylight, December has the shortest days of the year in Saul, French Guiana. On the first day of December in Saul, French Guiana, sunrise is at 06:25 and sunset at 18:19.