nomadseason

September Weather in Lucerne, United States

Last updated: June 24, 2025

In September, the average temperature in Lucerne, United States hovers around 17°C (62°F). However, be prepared for a wide temperature range, with lows plunging to -4°C (24°F) and highs reaching a sizzling 37°C (100°F). During this time, you can expect approximately 27 mm (1.0 in) of precipitation over a span of 3 days, while the air will carry an average humidity of 59%.

September Temperature in Lucerne

In September in Lucerne, the average temperature is 17°C (62°F). Maximums can reach 37°C (100°F), while minimums can dip as low as -4°C (24°F). Therefore, travelers should be prepared for a wide range of temperatures and pack accordingly for both warm and cold weather.

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

The chart illustrates September temperature patterns in Lucerne, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lucerne, September typically has an average temperature of 17°C (62°F), with highs reaching up to 37°C (100°F) and lows dropping to around -4°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec212137445467767262443424
Data source: Temperature data for Lucerne generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Lucerne

In Lucerne in September, the precipitation amount is 27 mm (1.0 in) over the course of 3 days.

September Precipitation Trends in Lucerne

The chart displays monthly precipitation patterns in Lucerne, 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 Lucerne, September typically receives around 27 mm (1.0 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec112122536727131827271714
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Lucerne

In Lucerne in September humidity is 59%. With an average temperature of 17°C (62°F), this humidity feels like a refreshing but slightly sticky embrace, making travel enjoyable yet requiring a light layer to stay comfortable as you explore the surroundings.

September Average Humidity in Lucerne

This chart illustrates the average monthly humidity levels in Lucerne, 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 Lucerne is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%82%72%69%67%65%59%59%69%83%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lucerne

In Lucerne in September, 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 Lucerne.

Maximum UV Index Levels in Lucerne for September

The chart shows the monthly maximum UV Index (UVI) for Lucerne 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 Lucerne typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Lucerne 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 Lucerne Compares to Other Months

Weather in Lucerne varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Lucerne, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Lucerne, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)11 mm (0.4 inches)90%moderate
February Weather-6°C (21°F)21 mm (0.8 inches)89%moderate
March Weather3°C (37°F)22 mm (0.9 inches)82%high
April Weather7°C (44°F)53 mm (2.1 inches)72%very high
May Weather12°C (54°F)67 mm (2.6 inches)69%very high
June Weather20°C (68°F)27 mm (1.1 inches)67%extreme
July Weather24°C (76°F)13 mm (0.5 inches)65%extreme
August Weather22°C (72°F)18 mm (0.7 inches)59%very high
September Weather17°C (62°F)27 mm (1.0 inches)59%very high
October Weather7°C (44°F)27 mm (1.1 inches)69%high
November Weather1°C (35°F)17 mm (0.7 inches)83%moderate
December Weather-4°C (24°F)14 mm (0.6 inches)89%moderate

Compare Lucerne's Climate with Cities Worldwide