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December Weather in Porto Velho, Brazil

Last updated: August 22, 2025

In December, the average temperature in Porto Velho, Brazil is a warm 26°C (79°F), with nightly lows dipping to 22°C (73°F) and daytime highs reaching up to 34°C (94°F). Be prepared for a splash of rain, as the region sees about 372 mm (14.7 in) of precipitation spread over 29 days. Coupled with an average humidity of 85%, it's essential to stay hydrated and seek shade during this tropical month!

December Temperature in Porto Velho

In December in Porto Velho, the average temperature is 26°C (79°F). The maximum can reach 34°C (94°F) and the minimum can be as low as 22°C (73°F). This makes Porto Velho an ideal destination for travelers seeking warm and pleasant weather.

December Weather in Porto Velho: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Porto Velho, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Porto Velho, 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 22°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec797879797979798182818079
Data source: Temperature data for Porto Velho 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 Porto Velho

In Porto Velho in December, the total precipitation amount is 372 mm (14.7 in) spread over 29 days.

December Precipitation Trends in Porto Velho

The chart displays monthly precipitation patterns in Porto Velho, 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 Porto Velho, December typically receives around 372 mm (14.7 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec2683693152681192733182185277372
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Porto Velho

In Porto Velho in December, humidity is 85%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities feel stifling and exhausting for travelers.

December Average Humidity in Porto Velho

This chart illustrates the average monthly humidity levels in Porto Velho, 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 Porto Velho is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%89%85%76%53%36%32%36%64%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Porto Velho

In Porto Velho 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 Porto Velho, you can check here.

Maximum UV Index Levels in Porto Velho for December

The chart shows the monthly maximum UV Index (UVI) for Porto Velho 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 Porto Velho typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151516151210101112141514
Data source: Porto Velho 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 Porto Velho Compares to Other Months

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

This table compares monthly weather conditions in Porto Velho, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)268 mm (10.5 inches)87%extreme
February Weather26°C (79°F)369 mm (14.5 inches)85%extreme
March Weather26°C (79°F)315 mm (12.4 inches)86%extreme
April Weather26°C (79°F)268 mm (10.5 inches)89%extreme
May Weather26°C (79°F)119 mm (4.7 inches)85%extreme
June Weather26°C (79°F)27 mm (1.1 inches)76%very high
July Weather26°C (80°F)3 mm (0.1 inches)53%very high
August Weather27°C (81°F)31 mm (1.2 inches)36%extreme
September Weather28°C (83°F)82 mm (3.2 inches)32%extreme
October Weather27°C (81°F)185 mm (7.3 inches)36%extreme
November Weather27°C (80°F)277 mm (10.9 inches)64%extreme
December Weather26°C (79°F)372 mm (14.7 inches)85%extreme

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