December Weather in Castanhal, Brazil

Last updated: August 22, 2025

In Castanhal, Brazil, the average temperature in December hovers around 27°C (81°F), with a minimum of 22°C (71°F) and a maximum reaching up to 36°C (98°F). This month typically sees 202 mm (8.0 in) of precipitation spread over 23 days, resulting in an average humidity of 82%. Be prepared for a mix of warmth and moisture!

December Temperature in Castanhal

In December in Castanhal, the average temperature is 27°C (81°F), with maximums reaching up to 36°C (98°F) and minimums dipping as low as 22°C (71°F). This warm climate makes Castanhal an ideal destination for travelers seeking sunny and pleasant weather.

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

The chart illustrates December temperature patterns in Castanhal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castanhal, December typically has an average temperature of 27°C (81°F), with highs reaching up to 36°C (98°F) and lows dropping to around 22°C (71°F).

Data source: Temperature data for Castanhal generated using information from the Copernicus Climate Change Service.

December Precipitation in Castanhal

In Castanhal in December, the precipitation amount is 202 mm (8.0 in) spread over 23 days.

December Precipitation Trends in Castanhal

The chart displays monthly precipitation patterns in Castanhal, 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 Castanhal, December typically receives around 202 mm (8.0 inches) of precipitation spread over approximately 23 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Castanhal

In Castanhal in December humidity is 82%. With an average temperature of 27°C (81°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel more exhausting, and leaving you longing for the relief of air-conditioned spaces during your travels.

December Average Humidity in Castanhal

This chart illustrates the average monthly humidity levels in Castanhal, 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 Castanhal is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Castanhal

In Castanhal in December, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Castanhal.

Maximum UV Index Levels in Castanhal for December

The chart shows the monthly maximum UV Index (UVI) for Castanhal 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 Castanhal typically reaches 13, which falls under the extreme exposure category.

Data source: Castanhal 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 Castanhal Compares to Other Months

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

This table compares monthly weather conditions in Castanhal, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	265 mm (10.4 inches)	89%	extreme
February Weather	26°C (79°F)	525 mm (20.7 inches)	81%	extreme
March Weather	26°C (79°F)	535 mm (21.1 inches)	81%	extreme
April Weather	26°C (79°F)	445 mm (17.5 inches)	85%	extreme
May Weather	26°C (80°F)	350 mm (13.8 inches)	89%	extreme
June Weather	27°C (80°F)	132 mm (5.2 inches)	86%	extreme
July Weather	27°C (80°F)	86 mm (3.4 inches)	81%	extreme
August Weather	27°C (81°F)	56 mm (2.2 inches)	72%	extreme
September Weather	28°C (82°F)	53 mm (2.1 inches)	69%	extreme
October Weather	28°C (83°F)	58 mm (2.3 inches)	69%	extreme
November Weather	28°C (82°F)	98 mm (3.9 inches)	71%	extreme
December Weather	27°C (81°F)	202 mm (8.0 inches)	82%	extreme