May Weather in Seia, Portugal

Last updated: August 27, 2025

In May, the average temperature in Seia, Portugal is a pleasant 16°C (61°F). However, temperatures can fluctuate, with a minimum of 2°C (35°F) and a maximum reaching 30°C (87°F). Expect around 56 mm (2.2 in) of precipitation spread over 9 days, contributing to a relatively high average humidity of 78%.

May Temperature in Seia

In May in Seia, the average temperature is 16°C (61°F). Maximums can reach 30°C (87°F) and minimums can be as low as 2°C (35°F). This varied climate makes it essential for travelers to pack for both warm and cool weather while exploring the area.

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

The chart illustrates May temperature patterns in Seia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seia, May typically has an average temperature of 16°C (61°F), with highs reaching up to 30°C (87°F) and lows dropping to around 2°C (35°F).

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

May Precipitation in Seia

In Seia in May, the precipitation amount is 56 mm (2.2 in) over a period of 9 days.

May Precipitation Trends in Seia

The chart displays monthly precipitation patterns in Seia, 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 Seia, May typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 9 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 Seia

In Seia in May, humidity is 78%. With an average temperature of 16°C (61°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as it clings to your skin and creates a heavy atmosphere that can drain your energy.

May Average Humidity in Seia

This chart illustrates the average monthly humidity levels in Seia, 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 Seia is approximately 78%, 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 Seia

In Seia 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 Seia.

Maximum UV Index Levels in Seia for May

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

Data source: Seia 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 Seia Compares to Other Months

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

This table compares monthly weather conditions in Seia, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (44°F)	68 mm (2.7 inches)	87%	moderate
February Weather	9°C (48°F)	110 mm (4.3 inches)	81%	moderate
March Weather	10°C (50°F)	133 mm (5.2 inches)	78%	high
April Weather	12°C (54°F)	125 mm (4.9 inches)	79%	very high
May Weather	16°C (61°F)	56 mm (2.2 inches)	78%	very high
June Weather	18°C (65°F)	39 mm (1.5 inches)	71%	extreme
July Weather	21°C (70°F)	12 mm (0.5 inches)	63%	very high
August Weather	21°C (71°F)	17 mm (0.7 inches)	64%	very high
September Weather	19°C (67°F)	43 mm (1.7 inches)	71%	very high
October Weather	15°C (59°F)	94 mm (3.7 inches)	79%	high
November Weather	10°C (50°F)	132 mm (5.2 inches)	86%	moderate
December Weather	8°C (47°F)	136 mm (5.4 inches)	87%	moderate