May Weather in Rio Maior, Portugal

Last updated: August 27, 2025

In May, the average temperature in Rio Maior, Portugal hovers around 18°C (64°F). Expect a minimum temperature of 8°C (47°F) and a pleasant maximum of 35°C (95°F). The region typically receives 39 mm (1.5 in) of precipitation over 5 days, contributing to an average humidity of 70%. Enjoy the comfortable climate while exploring all that Rio Maior has to offer!

May Temperature in Rio Maior

In May in Rio Maior, the average temperature is 18°C (64°F). Maximums can reach 35°C (95°F), while minimums can be as low as 8°C (47°F). This climate makes Rio Maior a great destination for travelers looking to experience mild weather with the possibility of warm days and cooler nights.

May Weather in Rio Maior: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Rio Maior, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Maior, May typically has an average temperature of 18°C (64°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (47°F).

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

May Precipitation in Rio Maior

In Rio Maior in May, the precipitation amount is 39 mm (1.5 in) spread over a duration of 5 days.

May Precipitation Trends in Rio Maior

The chart displays monthly precipitation patterns in Rio Maior, 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 Rio Maior, May typically receives around 39 mm (1.5 inches) of precipitation spread over approximately 5 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 Rio Maior

In Rio Maior in May humidity is 70%. With an average temperature of 18°C (64°F), this humidity feels like a sticky embrace, making outdoor excursions a bit more cumbersome and requiring frequent breaks to stay refreshed and hydrated.

May Average Humidity in Rio Maior

This chart illustrates the average monthly humidity levels in Rio Maior, 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 Rio Maior is approximately 70%, 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 Rio Maior

In Rio Maior in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Rio Maior.

Maximum UV Index Levels in Rio Maior for May

The chart shows the monthly maximum UV Index (UVI) for Rio Maior 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 Rio Maior typically reaches 10, which falls under the very high exposure category.

Data source: Rio Maior 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 Rio Maior Compares to Other Months

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

This table compares monthly weather conditions in Rio Maior, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	41 mm (1.6 inches)	85%	moderate
February Weather	12°C (54°F)	53 mm (2.1 inches)	75%	moderate
March Weather	13°C (56°F)	74 mm (2.9 inches)	72%	high
April Weather	15°C (59°F)	82 mm (3.2 inches)	70%	very high
May Weather	18°C (64°F)	39 mm (1.5 inches)	70%	very high
June Weather	19°C (67°F)	16 mm (0.6 inches)	63%	extreme
July Weather	21°C (70°F)	6 mm (0.2 inches)	60%	very high
August Weather	21°C (70°F)	6 mm (0.2 inches)	60%	very high
September Weather	21°C (69°F)	27 mm (1.1 inches)	67%	very high
October Weather	18°C (65°F)	58 mm (2.3 inches)	74%	high
November Weather	14°C (57°F)	88 mm (3.5 inches)	83%	moderate
December Weather	12°C (54°F)	64 mm (2.5 inches)	85%	moderate