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May Weather in Lisbon, United States

Last updated: June 24, 2025

In May, the average temperature in Lisbon, United States hovers around 13°C (55°F), making for a mild climate. However, be prepared for a temperature range that can dip as low as -2°C (29°F) or soar up to 33°C (92°F). With 92 mm (3.6 in) of precipitation spread over about 12 days, you may want to pack an umbrella. The air is often filled with 78% humidity, adding a touch of moisture to the atmosphere.

May Temperature in Lisbon

In May in Lisbon, the average temperature is 13°C (55°F), with maximums reaching 33°C (92°F) and minimums dropping as low as -2°C (29°F). It's advisable to pack layers to prepare for the diverse weather conditions during your travels.

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 13°C (55°F), with highs reaching up to 33°C (92°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec192229425564696760483424
Data source: Temperature data for Lisbon generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Lisbon

In Lisbon in May, the precipitation amount is 92 mm (3.6 in) over the course of 12 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 92 mm (3.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec7675651099395110796312910084
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Lisbon

In Lisbon in May, humidity is 78%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket enveloping you, making outdoor activities feel steamy and your clothes cling uncomfortably, often leaving you longing for a cool breeze or an air-conditioned escape 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.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
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.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)76 mm (3.0 inches)91%low
February Weather-5°C (22°F)75 mm (3.0 inches)89%moderate
March Weather-1°C (30°F)65 mm (2.6 inches)85%moderate
April Weather6°C (43°F)109 mm (4.3 inches)84%very high
May Weather13°C (55°F)92 mm (3.6 inches)78%very high
June Weather18°C (64°F)95 mm (3.7 inches)72%very high
July Weather21°C (69°F)110 mm (4.3 inches)75%very high
August Weather20°C (67°F)79 mm (3.1 inches)74%very high
September Weather16°C (60°F)63 mm (2.5 inches)77%high
October Weather9°C (49°F)129 mm (5.1 inches)85%moderate
November Weather1°C (34°F)100 mm (3.9 inches)86%moderate
December Weather-4°C (24°F)84 mm (3.3 inches)85%low

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