May Weather in Castanhal, Brazil

Last updated: August 22, 2025

In Castanhal, Brazil, the average temperature in May hovers around 26°C (80°F). The weather can be quite variable, with minimum temperatures dipping to 21°C (71°F) and soaring to a maximum of 34°C (93°F). Expect some rain, too, with an average precipitation amount of 350 mm (13.8 in) over 27 days. Humidity levels are high, averaging around 89%, creating a warm and steamy atmosphere.

May Temperature in Castanhal

In May in Castanhal, the average temperature is 26°C (80°F), with maximums that can reach 34°C (93°F) and minimums as low as 21°C (71°F). This warm and pleasant weather makes Castanhal an ideal destination for travelers seeking a comfortable climate.

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

The chart illustrates May 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, May typically has an average temperature of 26°C (80°F), with highs reaching up to 34°C (93°F) and lows dropping to around 21°C (71°F).

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

May Precipitation in Castanhal

In Castanhal in May, the precipitation amount reaches 350 mm (13.8 in) over the course of 27 days.

May Precipitation Trends in Castanhal

The chart displays monthly precipitation patterns in Castanhal, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Castanhal, May typically receives around 350 mm (13.8 inches) of precipitation spread over approximately 27 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Castanhal

In Castanhal in May, humidity is 89%. With an average temperature of 26°C (80°F), this humidity feels like a warm, sticky embrace, making travel feel exhausting as the air clings to your skin and saps your energy, urging you to seek shade and refreshment at every turn.

May Average Humidity in Castanhal

This chart illustrates the average monthly humidity levels in Castanhal, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Castanhal is approximately 89%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Castanhal

In Castanhal in May, 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 Castanhal, you can check here.

Maximum UV Index Levels in Castanhal for May

The chart shows the monthly maximum UV Index (UVI) for Castanhal in May, 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 May, the maximum UV index in Castanhal typically reaches 14, which falls under the extreme exposure category.

Data source: Castanhal May 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 May 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 May’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 May’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