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December Weather in Grajau, Brazil

Last updated: August 22, 2025

In December, the average temperature in Grajau, Brazil hovers around 27°C (82°F). With a minimum of 21°C (71°F) and a maximum reaching 37°C (99°F), the weather can vary significantly. Expect 124 mm (4.9 in) of precipitation over approximately 17 days, contributing to an average humidity level of 82%. Whether you're planning a visit or just curious, be prepared for warm, humid days!

December Temperature in Grajau

In December in Grajau, the average temperature is 27°C (82°F), with maximums reaching 37°C (99°F) and minimums dropping to as low as 21°C (71°F). This warm and pleasant climate makes Grajau an ideal destination for travelers seeking sun and adventure.

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

The chart illustrates December temperature patterns in Grajau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grajau, December typically has an average temperature of 27°C (82°F), with highs reaching up to 37°C (99°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec797979808181818284848281
Data source: Temperature data for Grajau 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 Grajau

In Grajau in December, the precipitation amount is 124 mm (4.9 in) over the course of 17 days.

December Precipitation Trends in Grajau

The chart displays monthly precipitation patterns in Grajau, 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 Grajau, December typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec1222141931464554293688124
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Grajau

In Grajau in December humidity is 82%. With an average temperature of 27°C (82°F), this humidity feels like stepping into a warm, thick blanket, making outdoor activities quite uncomfortable and travel feel a bit sluggish.

December Average Humidity in Grajau

This chart illustrates the average monthly humidity levels in Grajau, 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 Grajau is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%91%94%89%80%66%53%46%45%53%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Grajau

In Grajau 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 Grajau, you can check here.

Maximum UV Index Levels in Grajau for December

The chart shows the monthly maximum UV Index (UVI) for Grajau 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 Grajau typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151515151311111213131414
Data source: Grajau 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 Grajau Compares to Other Months

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

This table compares monthly weather conditions in Grajau, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (80°F)122 mm (4.8 inches)91%extreme
February Weather26°C (80°F)214 mm (8.4 inches)91%extreme
March Weather26°C (79°F)193 mm (7.6 inches)91%extreme
April Weather27°C (80°F)146 mm (5.8 inches)94%extreme
May Weather27°C (81°F)45 mm (1.8 inches)89%extreme
June Weather27°C (81°F)4 mm (0.2 inches)80%extreme
July Weather27°C (81°F)3 mm (0.1 inches)66%extreme
August Weather28°C (83°F)2 mm (0.1 inches)53%extreme
September Weather29°C (84°F)9 mm (0.4 inches)46%extreme
October Weather29°C (84°F)36 mm (1.4 inches)45%extreme
November Weather28°C (82°F)88 mm (3.4 inches)53%extreme
December Weather27°C (82°F)124 mm (4.9 inches)82%extreme

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