May Weather in Castelo, Brazil

Last updated: August 22, 2025

In May, the average temperature in Castelo, Brazil hovers around 20°C (68°F), with a minimum of 7°C (45°F) and a maximum reaching 30°C (87°F). Expect about 46 mm (1.8 in) of precipitation over the course of 10 days, accompanied by an average humidity of 82%.

May Temperature in Castelo

In May in Castelo, the average temperature is 20°C (68°F). Maximum temperatures can reach up to 30°C (87°F), while the minimum can drop as low as 7°C (45°F). This makes it an ideal time for travelers seeking pleasant weather and the opportunity to experience various outdoor activities.

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

The chart illustrates May temperature patterns in Castelo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelo, May typically has an average temperature of 20°C (68°F), with highs reaching up to 30°C (87°F) and lows dropping to around 7°C (45°F).

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

May Precipitation in Castelo

In Castelo in May, the precipitation amount is 46 mm (1.8 in) over the course of 10 days.

May Precipitation Trends in Castelo

The chart displays monthly precipitation patterns in Castelo, 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 Castelo, May typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 10 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 Castelo

In Castelo in May humidity is 82%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit sluggish but surprisingly refreshing, as long as you take breaks in shaded areas to cool off.

May Average Humidity in Castelo

This chart illustrates the average monthly humidity levels in Castelo, 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 Castelo is approximately 82%, 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 Castelo

In Castelo in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Castelo.

Maximum UV Index Levels in Castelo for May

The chart shows the monthly maximum UV Index (UVI) for Castelo 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 Castelo typically reaches 9, which falls under the very high exposure category.

Data source: Castelo 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 Castelo Compares to Other Months

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

This table compares monthly weather conditions in Castelo, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	25°C (77°F)	86 mm (3.4 inches)	80%	extreme
February Weather	24°C (75°F)	176 mm (6.9 inches)	85%	extreme
March Weather	23°C (74°F)	131 mm (5.1 inches)	86%	extreme
April Weather	22°C (71°F)	76 mm (3.0 inches)	85%	extreme
May Weather	20°C (68°F)	46 mm (1.8 inches)	82%	very high
June Weather	19°C (67°F)	24 mm (1.0 inches)	81%	high
July Weather	18°C (64°F)	18 mm (0.7 inches)	79%	very high
August Weather	18°C (65°F)	33 mm (1.3 inches)	75%	very high
September Weather	21°C (70°F)	50 mm (2.0 inches)	72%	extreme
October Weather	22°C (72°F)	114 mm (4.5 inches)	66%	extreme
November Weather	22°C (71°F)	167 mm (6.6 inches)	69%	extreme
December Weather	23°C (74°F)	175 mm (6.9 inches)	72%	extreme