December Weather in Fortuna, Brazil

Last updated: August 22, 2025

The average temperature in Fortuna, Brazil during December is a warm 27°C (81°F), with minimums dropping to 20°C (69°F) and maximums soaring to 36°C (98°F). Visitors can expect about 134 mm (5.3 in) of precipitation over 17 days, contributing to an average humidity level of 76%. Enjoy the vibrant climate as you explore!

December Temperature in Fortuna

In December in Fortuna, the average temperature is 27°C (81°F), with maximum highs reaching 36°C (98°F) and minimum lows dropping to 20°C (69°F). This climate makes Fortuna an ideal destination for travelers looking to enjoy warm weather and outdoor activities.

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

The chart illustrates December temperature patterns in Fortuna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fortuna, December typically has an average temperature of 27°C (81°F), with highs reaching up to 36°C (98°F) and lows dropping to around 20°C (69°F).

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

December Precipitation in Fortuna

In Fortuna in December, the total precipitation amount is 134 mm (5.3 in) over 17 days.

December Precipitation Trends in Fortuna

The chart displays monthly precipitation patterns in Fortuna, 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 Fortuna, December typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 17 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 Fortuna

In Fortuna in December, humidity is 76%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket enveloping you, making outdoor activities feel stifling and sweat-inducing, which can be challenging for traveling.

December Average Humidity in Fortuna

This chart illustrates the average monthly humidity levels in Fortuna, 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 Fortuna is approximately 76%, 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 Fortuna

In Fortuna in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Fortuna, you can check here.

Maximum UV Index Levels in Fortuna for December

The chart shows the monthly maximum UV Index (UVI) for Fortuna 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 Fortuna typically reaches 14, which falls under the extreme exposure category.

Data source: Fortuna 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 Fortuna Compares to Other Months

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

This table compares monthly weather conditions in Fortuna, 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 (6.6 inches)	90%	extreme
February Weather	26°C (79°F)	220 mm (8.7 inches)	91%	extreme
March Weather	26°C (78°F)	253 mm (9.9 inches)	92%	extreme
April Weather	26°C (79°F)	169 mm (6.6 inches)	93%	extreme
May Weather	27°C (80°F)	47 mm (1.9 inches)	88%	extreme
June Weather	27°C (81°F)	6 mm (0.2 inches)	75%	extreme
July Weather	27°C (81°F)	4 mm (0.2 inches)	52%	extreme
August Weather	28°C (83°F)	2 mm (0.1 inches)	42%	extreme
September Weather	29°C (85°F)	7 mm (0.3 inches)	36%	extreme
October Weather	29°C (85°F)	32 mm (1.2 inches)	35%	extreme
November Weather	28°C (82°F)	92 mm (3.6 inches)	43%	extreme
December Weather	27°C (81°F)	134 mm (5.3 inches)	76%	extreme