December Weather in Castelo do Piaui, Brazil

Last updated: August 22, 2025

In December, the average temperature in Castelo do Piaui, Brazil reaches a warm 30°C (86°F), perfect for outdoor activities. Expect a minimum of 22°C (72°F) and the possibility of highs up to 39°C (103°F). Be prepared for some rain, as 38 mm (1.5 in) of precipitation may occur over 7 days, contributing to an average humidity of 67%.

December Temperature in Castelo do Piaui

In December in Castelo do Piaui, the average temperature is 30°C (86°F), with maximums reaching up to 39°C (103°F) and minimums dropping as low as 22°C (72°F). This warm climate makes Castelo do Piaui an ideal destination for travelers seeking sun and outdoor activities.

December Weather in Castelo do Piaui: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Castelo do Piaui, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelo do Piaui, December typically has an average temperature of 30°C (86°F), with highs reaching up to 39°C (103°F) and lows dropping to around 22°C (72°F).

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

December Precipitation in Castelo do Piaui

In Castelo do Piaui in December, the precipitation amount is 38 mm (1.5 in) over the course of 7 days.

December Precipitation Trends in Castelo do Piaui

The chart displays monthly precipitation patterns in Castelo do Piaui, 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 Castelo do Piaui, December typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 7 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 Castelo do Piaui

In Castelo do Piaui in December humidity is 67%. With an average temperature of 30°C (86°F), this humidity feels like a warm blanket enveloping you, making outdoor activities a bit sticky and challenging but still manageable with frequent breaks for hydration and shade.

December Average Humidity in Castelo do Piaui

This chart illustrates the average monthly humidity levels in Castelo do Piaui, 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 Castelo do Piaui is approximately 67%, 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 Castelo do Piaui

In Castelo do Piaui 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 Castelo do Piaui, you can check here.

Maximum UV Index Levels in Castelo do Piaui for December

The chart shows the monthly maximum UV Index (UVI) for Castelo do Piaui 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 Castelo do Piaui typically reaches 14, which falls under the extreme exposure category.

Data source: Castelo do Piaui 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 Castelo do Piaui Compares to Other Months

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

This table compares monthly weather conditions in Castelo do Piaui, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	28°C (83°F)	116 mm (4.6 inches)	90%	extreme
February Weather	27°C (81°F)	263 mm (10.4 inches)	91%	extreme
March Weather	27°C (80°F)	298 mm (11.7 inches)	93%	extreme
April Weather	27°C (80°F)	177 mm (7.0 inches)	93%	extreme
May Weather	27°C (82°F)	42 mm (1.7 inches)	88%	extreme
June Weather	28°C (83°F)	3 mm (0.1 inches)	75%	extreme
July Weather	28°C (83°F)	7 mm (0.3 inches)	55%	extreme
August Weather	30°C (86°F)	1 mm (0.0 inches)	46%	extreme
September Weather	31°C (88°F)	1 mm (0.0 inches)	41%	extreme
October Weather	31°C (89°F)	7 mm (0.3 inches)	38%	extreme
November Weather	31°C (88°F)	20 mm (0.8 inches)	43%	extreme
December Weather	30°C (86°F)	38 mm (1.5 inches)	67%	extreme