nomadseason

September Weather in Saint-Leonard, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Saint-Leonard, Switzerland hovers around 9°C (49°F), with temperatures ranging from a brisk -5°C (23°F) to a warm 22°C (72°F). Expect a precipitation total of 90 mm (3.6 in) spread over about 12 days, contributing to an average humidity level of 81%. Prepare for both chilly and mild days!

September Temperature in Saint-Leonard

In September in Saint-Leonard, the average temperature is 9°C (49°F). Maximum temperatures can reach 22°C (72°F), while the minimum can drop to as low as -5°C (23°F). This variation makes Saint-Leonard a destination where travelers should be prepared for both mild days and chilly nights.

September Weather in Saint-Leonard: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint-Leonard, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint-Leonard, September typically has an average temperature of 9°C (49°F), with highs reaching up to 22°C (72°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec162329374353565649412918
Data source: Temperature data for Saint-Leonard 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 Saint-Leonard

In Saint-Leonard in September, the precipitation amount is 90 mm (3.6 in) spread over 12 days.

September Precipitation Trends in Saint-Leonard

The chart displays monthly precipitation patterns in Saint-Leonard, 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 Saint-Leonard, September typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec13596122811601301211299013598188
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Saint-Leonard

In Saint-Leonard in September humidity is 81%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill clinging to your skin, making outdoor explorations rather uncomfortable and potentially dreary for travelers.

September Average Humidity in Saint-Leonard

This chart illustrates the average monthly humidity levels in Saint-Leonard, 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 Saint-Leonard is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%84%80%82%82%77%81%89%89%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint-Leonard

In Saint-Leonard 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 Saint-Leonard.

Maximum UV Index Levels in Saint-Leonard for September

The chart shows the monthly maximum UV Index (UVI) for Saint-Leonard 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 Saint-Leonard typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec347810111097632
Data source: Saint-Leonard 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 Saint-Leonard Compares to Other Months

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

This table compares monthly weather conditions in Saint-Leonard, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)135 mm (5.3 inches)91%moderate
February Weather-5°C (23°F)95 mm (3.8 inches)89%moderate
March Weather-2°C (29°F)122 mm (4.8 inches)87%high
April Weather3°C (37°F)81 mm (3.2 inches)84%very high
May Weather6°C (43°F)160 mm (6.3 inches)80%very high
June Weather12°C (53°F)130 mm (5.1 inches)82%extreme
July Weather14°C (57°F)121 mm (4.8 inches)82%very high
August Weather13°C (56°F)129 mm (5.1 inches)77%very high
September Weather9°C (49°F)90 mm (3.6 inches)81%high
October Weather5°C (41°F)135 mm (5.3 inches)89%high
November Weather-2°C (29°F)98 mm (3.8 inches)89%moderate
December Weather-8°C (18°F)188 mm (7.4 inches)91%low

Compare Saint-Leonard's Climate with Cities Worldwide