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December Weather in Brazil, United States

Last updated: June 24, 2025

In December, the average temperature in Brazil, United States hovers around 3°C (37°F). Expect chilly nights with a minimum of -18°C (-1°F), while daytime highs can reach up to 18°C (65°F). With an average precipitation of 90 mm (3.5 in) spread over 10 days, pack an umbrella! Humidity levels are notably high at 87%, so be prepared for a damp atmosphere.

December Temperature in Brazil

In December in Brazil, the average temperature is 3°C (37°F). Maximums can reach 18°C (65°F), and minimums can be as low as -18°C (-1°F). Be prepared for a wide range of temperatures and dress accordingly when traveling to Brazil during this month.

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

The chart illustrates December temperature patterns in Brazil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brazil, December typically has an average temperature of 3°C (37°F), with highs reaching up to 18°C (65°F) and lows dropping to around -18°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec313444536574777470584237
Data source: Temperature data for Brazil 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 Brazil

In Brazil in December, the precipitation amount is 90 mm (3.5 in) over the course of 10 days.

December Precipitation Trends in Brazil

The chart displays monthly precipitation patterns in Brazil, 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 Brazil, December typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8698130105134115106108691129790
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Brazil

In Brazil in December, humidity is 87%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating proper layers to stay warm while navigating the wet conditions.

December Average Humidity in Brazil

This chart illustrates the average monthly humidity levels in Brazil, 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 Brazil is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Brazil

In Brazil in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Brazil, you can check the information here.

Maximum UV Index Levels in Brazil for December

The chart shows the monthly maximum UV Index (UVI) for Brazil 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 Brazil typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Brazil 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 Brazil Compares to Other Months

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

This table compares monthly weather conditions in Brazil, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)85 mm (3.4 inches)87%moderate
February Weather1°C (34°F)98 mm (3.9 inches)85%moderate
March Weather6°C (44°F)130 mm (5.1 inches)86%high
April Weather12°C (53°F)105 mm (4.1 inches)84%very high
May Weather18°C (66°F)134 mm (5.3 inches)79%very high
June Weather23°C (75°F)115 mm (4.5 inches)82%extreme
July Weather25°C (78°F)106 mm (4.2 inches)79%very high
August Weather24°C (75°F)108 mm (4.3 inches)70%very high
September Weather21°C (71°F)68 mm (2.7 inches)69%very high
October Weather15°C (58°F)112 mm (4.4 inches)76%high
November Weather6°C (42°F)97 mm (3.8 inches)88%moderate
December Weather3°C (37°F)90 mm (3.5 inches)87%moderate

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