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December Weather in Rialma, Brazil

Last updated: August 22, 2025

In Rialma, Brazil, the average temperature in December is a comfortable 25°C (77°F), with a minimum of 17°C (64°F) and a maximum soaring to 35°C (94°F). Be prepared for some rain, as you'll likely experience 234 mm (9.2 in) of precipitation over 21 days. Don't forget that the average humidity hovers around 70%, making the air feel a bit more tropical!

December Temperature in Rialma

In December in Rialma, the average temperature is 25°C (77°F). Maximum can reach 35°C (94°F) and minimum can be as low as 17°C (64°F). This pleasant climate makes it an ideal time for outdoor activities and exploration.

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

The chart illustrates December temperature patterns in Rialma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rialma, December typically has an average temperature of 25°C (77°F), with highs reaching up to 35°C (94°F) and lows dropping to around 17°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec777676767473727781807776
Data source: Temperature data for Rialma 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 Rialma

In Rialma in December, the total precipitation amount reaches 234 mm (9.2 in) over the course of 21 days.

December Precipitation Trends in Rialma

The chart displays monthly precipitation patterns in Rialma, 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 Rialma, December typically receives around 234 mm (9.2 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec130184134669001488166234
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rialma

In Rialma in December, humidity is 70%. With an average temperature of 25°C (77°F), this humidity feels like walking through a warm, moist blanket that clings to your skin, making every step feel heavier as you explore the sights and sounds of your destination.

December Average Humidity in Rialma

This chart illustrates the average monthly humidity levels in Rialma, 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 Rialma is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%90%90%82%65%59%53%44%34%26%50%70%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rialma

In Rialma in December, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Rialma.

Maximum UV Index Levels in Rialma for December

The chart shows the monthly maximum UV Index (UVI) for Rialma 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 Rialma typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec16161413119101213151516
Data source: Rialma 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 Rialma Compares to Other Months

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

This table compares monthly weather conditions in Rialma, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)130 mm (5.1 inches)86%extreme
February Weather24°C (76°F)184 mm (7.2 inches)89%extreme
March Weather25°C (77°F)133 mm (5.3 inches)90%extreme
April Weather25°C (77°F)66 mm (2.6 inches)82%extreme
May Weather24°C (75°F)9 mm (0.3 inches)65%extreme
June Weather23°C (73°F)0 mm (0.0 inches)59%very high
July Weather22°C (72°F)0 mm (0.0 inches)53%very high
August Weather25°C (77°F)0 mm (0.0 inches)44%extreme
September Weather27°C (81°F)4 mm (0.1 inches)34%extreme
October Weather27°C (80°F)88 mm (3.5 inches)26%extreme
November Weather25°C (77°F)166 mm (6.5 inches)50%extreme
December Weather25°C (77°F)234 mm (9.2 inches)70%extreme

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