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September Weather in Lisbon, United States

Last updated: June 24, 2025

In September, the average temperature in Lisbon, United States hovers around 16°C (60°F). This month can bring a mix of weather, with lows dipping to -5°C (24°F) and highs reaching up to 31°C (88°F). Expect about 63 mm (2.5 in) of precipitation over 8 days, accompanied by a relatively high average humidity of 77%.

September Temperature in Lisbon

In September in Lisbon, the average temperature is 16°C (60°F). Maximums can reach 31°C (88°F) and minimums can be as low as -5°C (24°F). It's important to be prepared for a wide range of temperatures when traveling during this time.

September Weather in Lisbon: Daily Temperature Highs, Lows, and Averages

The chart illustrates September 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, September typically has an average temperature of 16°C (60°F), with highs reaching up to 31°C (88°F) and lows dropping to around -5°C (24°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.

September Precipitation in Lisbon

In Lisbon in September, the precipitation amount is 63 mm (2.5 in) spread over 8 days.

September Precipitation Trends in Lisbon

The chart displays monthly precipitation patterns in Lisbon, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Lisbon, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7675651099395110796312910084
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lisbon

In Lisbon in September, humidity is 77%. With an average temperature of 16°C (60°F), this humidity feels like a moist blanket wrapping around you, making outdoor activities a bit uncomfortable and requiring frequent hydration as you soak in the vibrant local culture.

September Average Humidity in Lisbon

This chart illustrates the average monthly humidity levels in Lisbon, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Lisbon is approximately 77%, 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 September generated using information from the Copernicus Climate Change Service.

September UV Index in Lisbon

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.

Maximum UV Index Levels in Lisbon for September

The chart shows the monthly maximum UV Index (UVI) for Lisbon in September, 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 September, the maximum UV index in Lisbon typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Lisbon September 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 September 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 September’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 September’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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