French Guiana weather in December 2026

Expect daytime maximum temperatures of 30°C in French Guiana in December and high heat and humidity based on long-term weather averages. There are 5 hours of sunshine per day on average with 18 days with some rainfall and typically 294 mm of rainfall in the month.

  • 30°C maximum daytime temperature in December in French Guiana (Cayenne)30
    30°C max day temperature
  • 5 hours of sunshine per day
  • 18 days with some rainfall in December in French Guiana (Cayenne)18
    18 days with some rainfall
  • 23°C minimum night-time temperature in December in French Guiana (Cayenne)23
    23°C min night temperature
  • 12 hours of daylight per day in December in French Guiana (Cayenne)12
    12 hours of daylight per day
  • High heat & humidity in December in French Guiana (Cayenne)H
    High heat & humidity
  • 294 mm monthly rainfall in December in French Guiana (Cayenne)294
    294 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in December in French Guiana (Cayenne)11
    11 (Extreme) UV index
  • 27°C sea temperature in December in French Guiana (Cayenne)27
    27°C sea temperature

More about French Guiana

French Guiana by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec