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May Weather in Lisbon, United States

Last updated: June 24, 2025

In Lisbon, United States, the average temperature in May hovers around 16°C (62°F), with lows dipping to a brisk -2°C (29°F) and highs soaring to a warm 31°C (89°F). Expect around 130 mm (5.1 in) of precipitation spread over approximately 15 days, coupled with a high average humidity of 81%. Prepare for varied weather this month!

May Temperature in Lisbon

In May in Lisbon, the average temperature is 16°C (62°F). Maximums can reach 31°C (89°F) and minimums can drop as low as -2°C (29°F). Be prepared for a wide range of temperatures, so pack accordingly for 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 16°C (62°F), with highs reaching up to 31°C (89°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec303340506270747267564135
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 total precipitation amount is 130 mm (5.1 in) over the course 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 130 mm (5.1 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec91106101132130131133991151169496
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 81%. With an average temperature of 16°C (62°F), this humidity feels like a warm embrace that can quickly leave travelers feeling sticky and drained, making outdoor adventures a bit challenging unless they stay properly hydrated and take breaks in the shade.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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-1°C (30°F)91 mm (3.6 inches)88%moderate
February Weather1°C (34°F)106 mm (4.2 inches)88%moderate
March Weather5°C (41°F)101 mm (4.0 inches)87%high
April Weather10°C (51°F)132 mm (5.2 inches)87%very high
May Weather16°C (62°F)130 mm (5.1 inches)81%very high
June Weather21°C (70°F)131 mm (5.2 inches)83%very high
July Weather24°C (75°F)133 mm (5.2 inches)82%very high
August Weather22°C (72°F)98 mm (3.9 inches)76%very high
September Weather19°C (67°F)114 mm (4.5 inches)77%very high
October Weather14°C (57°F)116 mm (4.6 inches)82%high
November Weather5°C (41°F)94 mm (3.7 inches)89%moderate
December Weather2°C (35°F)95 mm (3.8 inches)86%low

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