May Weather in Mertola, Portugal

Last updated: August 27, 2025

In Mertola, Portugal, the average temperature in May hovers around 20°C (68°F). However, it's not unusual to experience a range from a brisk 5°C (42°F) to a sweltering 36°C (97°F). During this month, expect about 26 mm (1.0 in) of precipitation spread over 4 rainy days, with an average humidity of 69%. This blend of temperatures and moisture creates a unique climate experience!

May Temperature in Mertola

In May, in Mertola, the average temperature is 20°C (68°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 5°C (42°F). This makes Mertola an ideal destination for travelers seeking a warm climate while also being prepared for cooler evenings.

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

The chart illustrates May temperature patterns in Mertola, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mertola, May typically has an average temperature of 20°C (68°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (42°F).

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

May Precipitation in Mertola

In Mertola in May, the precipitation amount is 26 mm (1.0 in) over the course of 4 days.

May Precipitation Trends in Mertola

The chart displays monthly precipitation patterns in Mertola, 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 Mertola, May typically receives around 26 mm (1.0 inches) of precipitation spread over approximately 4 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 Mertola

In Mertola in May, humidity is 69%. With an average temperature of 20°C (68°F), this humidity feels like walking through a warm, enveloping mist, making outdoor activities enjoyable yet a bit sticky, so it's best to stay hydrated and take breaks in the shade.

May Average Humidity in Mertola

This chart illustrates the average monthly humidity levels in Mertola, 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 Mertola is approximately 69%, 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 Mertola

In Mertola 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 Mertola.

Maximum UV Index Levels in Mertola for May

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

Data source: Mertola 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 Mertola Compares to Other Months

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

This table compares monthly weather conditions in Mertola, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	23 mm (0.9 inches)	80%	moderate
February Weather	12°C (54°F)	37 mm (1.5 inches)	73%	moderate
March Weather	13°C (56°F)	67 mm (2.7 inches)	71%	high
April Weather	15°C (60°F)	55 mm (2.2 inches)	69%	very high
May Weather	20°C (68°F)	26 mm (1.0 inches)	69%	very high
June Weather	22°C (72°F)	9 mm (0.4 inches)	67%	extreme
July Weather	24°C (76°F)	2 mm (0.1 inches)	69%	extreme
August Weather	26°C (78°F)	2 mm (0.1 inches)	68%	very high
September Weather	23°C (74°F)	22 mm (0.8 inches)	71%	very high
October Weather	19°C (67°F)	38 mm (1.5 inches)	75%	high
November Weather	14°C (57°F)	48 mm (1.9 inches)	78%	moderate
December Weather	11°C (53°F)	40 mm (1.6 inches)	81%	moderate