May Weather in Lisbon, United States

Last updated: June 24, 2025

In May, the average temperature in Lisbon, United States hovers around 16°C (62°F). Expect a wide range, with minimums dipping to 0°C (32°F) and maximums soaring to 34°C (94°F). Be prepared for 150 mm (5.9 in) of precipitation spread over about 15 days, accompanied by an average humidity of 78%.

May Temperature in Lisbon

In May in Lisbon, the average temperature is 16°C (62°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop as low as 0°C (32°F). This diverse temperature range makes Lisbon an ideal destination for travelers seeking both warm days and cool evenings.

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 16°C (62°F), with highs reaching up to 34°C (94°F) and lows dropping to around 0°C (32°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 total precipitation amount is 150 mm (5.9 in) over a span of 15 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 150 mm (5.9 inches) of precipitation spread over approximately 15 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 78%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities enjoyable yet slightly sticky. Travelers may find the weather pleasantly mild, though they'll appreciate having light, breathable clothing on hand to stay comfortable while exploring.

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 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 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	-6°C (21°F)	47 mm (1.9 inches)	81%	moderate
February Weather	-5°C (23°F)	58 mm (2.3 inches)	81%	moderate
March Weather	3°C (38°F)	73 mm (2.9 inches)	81%	high
April Weather	9°C (48°F)	81 mm (3.2 inches)	82%	very high
May Weather	16°C (62°F)	150 mm (5.9 inches)	78%	very high
June Weather	23°C (73°F)	125 mm (4.9 inches)	81%	extreme
July Weather	24°C (76°F)	81 mm (3.2 inches)	79%	very high
August Weather	22°C (73°F)	83 mm (3.3 inches)	77%	very high
September Weather	19°C (67°F)	130 mm (5.1 inches)	78%	very high
October Weather	11°C (53°F)	136 mm (5.4 inches)	78%	high
November Weather	3°C (38°F)	48 mm (1.9 inches)	87%	moderate
December Weather	-1°C (30°F)	45 mm (1.8 inches)	84%	moderate