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%.
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!
In Lisbon in May, the precipitation amount is 78 mm (3.1 in) over the course of 10 days.
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.
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.
UV Risk Categories
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.
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 |