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December Weather in Rio Branco, Brazil

Last updated: August 22, 2025

In December, the average temperature in Rio Branco, Brazil hovers around 26°C (79°F), providing a warm atmosphere for visitors. However, temperatures can vary, with a minimum of 21°C (71°F) and a sweltering maximum of 34°C (94°F). Expect a humid environment, with an average humidity level of 88%, and prepare for 305 mm (12.0 in) of precipitation spread over 26 days.

December Temperature in Rio Branco

In December in Rio Branco, the average temperature is 26°C (79°F), with maximums reaching up to 34°C (94°F) and minimums dipping as low as 21°C (71°F). This pleasant climate makes it an ideal time for outdoor activities and exploring the sights.

December Weather in Rio Branco: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rio Branco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Branco, December typically has an average temperature of 26°C (79°F), with highs reaching up to 34°C (94°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec787878787776767881807979
Data source: Temperature data for Rio Branco generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Rio Branco

In Rio Branco in December, the total precipitation amount is 305 mm (12.0 in) over the course of 26 days.

December Precipitation Trends in Rio Branco

The chart displays monthly precipitation patterns in Rio Branco, 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 Rio Branco, December typically receives around 305 mm (12.0 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec2642852881688333142653125207305
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rio Branco

In Rio Branco in December, humidity is 88%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapped around you, making travel somewhat uncomfortable as you quickly become aware of the stickiness and heaviness in the air.

December Average Humidity in Rio Branco

This chart illustrates the average monthly humidity levels in Rio Branco, 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 Rio Branco is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%89%84%67%46%37%33%44%73%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rio Branco

In Rio Branco 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 Rio Branco, you can check here.

Maximum UV Index Levels in Rio Branco for December

The chart shows the monthly maximum UV Index (UVI) for Rio Branco 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 Rio Branco typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151616141210101112141514
Data source: Rio Branco 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 Rio Branco Compares to Other Months

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

This table compares monthly weather conditions in Rio Branco, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)264 mm (10.4 inches)88%extreme
February Weather25°C (78°F)285 mm (11.2 inches)87%extreme
March Weather26°C (78°F)288 mm (11.3 inches)87%extreme
April Weather26°C (78°F)168 mm (6.6 inches)89%extreme
May Weather25°C (77°F)83 mm (3.3 inches)84%extreme
June Weather24°C (76°F)33 mm (1.3 inches)67%very high
July Weather25°C (76°F)14 mm (0.6 inches)46%very high
August Weather26°C (79°F)26 mm (1.0 inches)37%extreme
September Weather27°C (82°F)53 mm (2.1 inches)33%extreme
October Weather27°C (81°F)125 mm (4.9 inches)44%extreme
November Weather26°C (80°F)206 mm (8.1 inches)73%extreme
December Weather26°C (79°F)305 mm (12.0 inches)88%extreme

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