May Weather in Lisbon, United States

Last updated: June 24, 2025

In May, the average temperature in Lisbon, United States is a comfortable 12°C (55°F). Expect a minimum of 1°C (34°F) and a maximum of 31°C (88°F), providing a wide range of weather experiences. During this month, the area sees 78 mm (3.1 in) of precipitation over approximately 10 days, complemented by an average humidity of 72%.

May Temperature in Lisbon

In May in Lisbon, the average temperature is 12°C (55°F), with maximums reaching 31°C (88°F) and minimums dropping as low as 1°C (34°F). Pack for both warm days and cool nights to ensure a comfortable trip!

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

The chart illustrates May temperature patterns in Lisbon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lisbon, May typically has an average temperature of 12°C (55°F), with highs reaching up to 31°C (88°F) and lows dropping to around 1°C (34°F).

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

May Precipitation in Lisbon

In Lisbon in May, the precipitation amount is 78 mm (3.1 in) over the course of 10 days.

May Precipitation Trends in Lisbon

The chart displays monthly precipitation patterns in Lisbon, 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 Lisbon, May typically receives around 78 mm (3.1 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 Lisbon

In Lisbon in May, humidity is 72%. With an average temperature of 12°C (55°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration a little less comfortable and requiring a light jacket to stay warm and dry.

May Average Humidity in Lisbon

This chart illustrates the average monthly humidity levels in Lisbon, 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 Lisbon is approximately 72%, 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 Lisbon

In Lisbon 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 Lisbon.

Maximum UV Index Levels in Lisbon for May

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

Data source: Lisbon 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 Lisbon Compares to Other Months

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

This table compares monthly weather conditions in Lisbon, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	83 mm (3.3 inches)	86%	low
February Weather	-3°C (27°F)	87 mm (3.4 inches)	84%	moderate
March Weather	0°C (33°F)	73 mm (2.9 inches)	82%	moderate
April Weather	7°C (44°F)	118 mm (4.7 inches)	80%	high
May Weather	12°C (55°F)	78 mm (3.1 inches)	72%	very high
June Weather	18°C (65°F)	66 mm (2.6 inches)	72%	very high
July Weather	21°C (70°F)	117 mm (4.6 inches)	67%	very high
August Weather	21°C (70°F)	77 mm (3.0 inches)	66%	very high
September Weather	17°C (63°F)	70 mm (2.8 inches)	71%	high
October Weather	11°C (53°F)	131 mm (5.1 inches)	78%	moderate
November Weather	4°C (39°F)	114 mm (4.5 inches)	84%	moderate
December Weather	-2°C (29°F)	120 mm (4.7 inches)	81%	low