December Weather in Bastos, Brazil

Last updated: August 22, 2025

In December, the average temperature in Bastos, Brazil hovers around 26°C (79°F). Daily temperatures can range from a cool 16°C (61°F) to a sweltering 37°C (99°F). Expect 141 mm (5.5 in) of precipitation spread across 17 days, contributing to a high average humidity of 82%.

December Temperature in Bastos

In December in Bastos, the average temperature is 26°C (79°F). Maximums can reach 37°C (99°F), while minimums can dip as low as 16°C (61°F). This variety in temperatures makes it a perfect time for travelers to enjoy both the warm days and cooler evenings.

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

The chart illustrates December temperature patterns in Bastos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bastos, December typically has an average temperature of 26°C (79°F), with highs reaching up to 37°C (99°F) and lows dropping to around 16°C (61°F).

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

December Precipitation in Bastos

In Bastos in December, the total precipitation amount is 141 mm (5.5 in) spread over 17 days.

December Precipitation Trends in Bastos

The chart displays monthly precipitation patterns in Bastos, 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 Bastos, December typically receives around 141 mm (5.5 inches) of precipitation spread over approximately 17 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 Bastos

In Bastos in December, humidity is 82%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket that envelops you, making outdoor activities feel more taxing and requiring frequent breaks to stay hydrated.

December Average Humidity in Bastos

This chart illustrates the average monthly humidity levels in Bastos, 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 Bastos 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 Bastos

In Bastos 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 Bastos.

Maximum UV Index Levels in Bastos for December

The chart shows the monthly maximum UV Index (UVI) for Bastos 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 Bastos typically reaches 16, which falls under the extreme exposure category.

Data source: Bastos 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 Bastos Compares to Other Months

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

This table compares monthly weather conditions in Bastos, 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)	149 mm (5.9 inches)	84%	extreme
February Weather	26°C (79°F)	144 mm (5.7 inches)	81%	extreme
March Weather	26°C (79°F)	86 mm (3.4 inches)	81%	extreme
April Weather	24°C (76°F)	45 mm (1.8 inches)	75%	extreme
May Weather	22°C (71°F)	41 mm (1.6 inches)	68%	very high
June Weather	21°C (70°F)	25 mm (1.0 inches)	64%	high
July Weather	21°C (70°F)	6 mm (0.2 inches)	58%	high
August Weather	22°C (71°F)	45 mm (1.8 inches)	49%	very high
September Weather	26°C (79°F)	30 mm (1.2 inches)	47%	extreme
October Weather	26°C (78°F)	105 mm (4.1 inches)	44%	extreme
November Weather	26°C (79°F)	102 mm (4.0 inches)	68%	extreme
December Weather	26°C (79°F)	141 mm (5.5 inches)	82%	extreme