December Weather in Sinnamary, French Guiana

Last updated: August 23, 2025

In December, the average temperature in Sinnamary, French Guiana hovers around 26°C (79°F), with daytime highs reaching up to 29°C (84°F) and a cooler minimum of 24°C (75°F). Expect considerable rainfall, with 294 mm (11.6 in) of precipitation spread over 29 days, contributing to a 79% average humidity that makes the atmosphere feel quite intense.

December Temperature in Sinnamary

In December in Sinnamary, the average temperature is 26°C (79°F), with maximums reaching 29°C (84°F) and minimums dipping to 24°C (75°F). This pleasant climate makes it an ideal time to explore the local sights and enjoy outdoor activities.

December Weather in Sinnamary: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sinnamary, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sinnamary, December typically has an average temperature of 26°C (79°F), with highs reaching up to 29°C (84°F) and lows dropping to around 24°C (75°F).

Data source: Temperature data for Sinnamary generated using information from the Copernicus Climate Change Service.

December Precipitation in Sinnamary

In Sinnamary in December, the total precipitation amount is 294 mm (11.6 in) over the course of 29 days.

December Precipitation Trends in Sinnamary

The chart displays monthly precipitation patterns in Sinnamary, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Sinnamary, December typically receives around 294 mm (11.6 inches) of precipitation spread over approximately 29 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Sinnamary

In Sinnamary in December humidity is 79%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting. Travelers should be prepared for a heavy air that clings to the skin, making hydration essential while navigating the sights and sounds of the city.

December Average Humidity in Sinnamary

This chart illustrates the average monthly humidity levels in Sinnamary, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Sinnamary is approximately 79%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sinnamary

In Sinnamary in December, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Sinnamary.

Maximum UV Index Levels in Sinnamary for December

The chart shows the monthly maximum UV Index (UVI) for Sinnamary in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Sinnamary typically reaches 11, which falls under the extreme exposure category.

Data source: Sinnamary December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Sinnamary Compares to Other Months

Weather in Sinnamary varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sinnamary, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sinnamary, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	169 mm (6.7 inches)	70%	extreme
February Weather	26°C (79°F)	135 mm (5.3 inches)	66%	extreme
March Weather	26°C (79°F)	153 mm (6.0 inches)	66%	extreme
April Weather	26°C (80°F)	334 mm (13.2 inches)	66%	extreme
May Weather	26°C (80°F)	475 mm (18.7 inches)	68%	extreme
June Weather	26°C (80°F)	423 mm (16.6 inches)	86%	extreme
July Weather	26°C (80°F)	242 mm (9.5 inches)	76%	extreme
August Weather	27°C (81°F)	103 mm (4.1 inches)	65%	extreme
September Weather	27°C (82°F)	68 mm (2.7 inches)	62%	extreme
October Weather	27°C (82°F)	70 mm (2.8 inches)	63%	extreme
November Weather	27°C (81°F)	202 mm (8.0 inches)	74%	extreme
December Weather	26°C (79°F)	294 mm (11.6 inches)	79%	extreme