Last updated: June 24, 2025
In September, the average temperature in Lisbon, United States hovers around 16°C (61°F). Keep in mind that temperatures can vary widely; you might experience a chilly minimum of -2°C (29°F) or a warm maximum of 33°C (91°F). During this month, expect around 66 mm (2.6 in) of precipitation over about 7 days, with an average humidity level of 72%, adding to the overall atmosphere.
In September in Lisbon, the average temperature is 16°C (61°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop to as low as -2°C (29°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack both warm and cool clothing.
In Lisbon in September, the precipitation amount is 66 mm (2.6 in) over a period of 7 days.
In Lisbon in September humidity is 72%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making every step feel heavier and requiring extra effort while traveling.
In Lisbon in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 September’s weather to other months in Lisbon, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -11°C (13°F) | 18 mm (0.7 inches) | 87% | low |
February Weather | -11°C (12°F) | 20 mm (0.8 inches) | 89% | moderate |
March Weather | -2°C (29°F) | 28 mm (1.1 inches) | 82% | moderate |
April Weather | 4°C (40°F) | 51 mm (2.0 inches) | 79% | high |
May Weather | 14°C (57°F) | 57 mm (2.3 inches) | 74% | very high |
June Weather | 21°C (70°F) | 79 mm (3.1 inches) | 78% | very high |
July Weather | 23°C (73°F) | 71 mm (2.8 inches) | 76% | very high |
August Weather | 20°C (69°F) | 108 mm (4.2 inches) | 77% | very high |
September Weather | 16°C (61°F) | 66 mm (2.6 inches) | 72% | high |
October Weather | 7°C (45°F) | 84 mm (3.3 inches) | 74% | moderate |
November Weather | -1°C (30°F) | 16 mm (0.6 inches) | 85% | moderate |
December Weather | -7°C (20°F) | 37 mm (1.5 inches) | 84% | low |