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September Weather in Sankt Stephan, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Sankt Stephan Switzerland hovers around 9°C (49°F), with extremes ranging from a chilly -5°C (23°F) to a comfortable 22°C (72°F). Expect 131 mm (5.1 in) of precipitation spread over approximately 16 days, contributing to an average humidity level of 81%. Perfect for cozy indoor activities or a refreshing stroll!

September Temperature in Sankt Stephan

In September in Sankt Stephan, 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 Sankt Stephan a destination where travelers should be prepared for both mild days and chilly nights.

September Weather in Sankt Stephan: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sankt Stephan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sankt Stephan, 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).
JanFebMarAprMayJunJulAugSepOctNovDec192630374454565549413022
Data source: Temperature data for Sankt Stephan 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 Sankt Stephan

In Sankt Stephan in September, the total precipitation amount is 131 mm (5.1 in) over a span of 16 days.

September Precipitation Trends in Sankt Stephan

The chart displays monthly precipitation patterns in Sankt Stephan, 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 Sankt Stephan, September typically receives around 131 mm (5.1 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec17413216199223184224196131151107248
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sankt Stephan

In Sankt Stephan 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 Sankt Stephan

This chart illustrates the average monthly humidity levels in Sankt Stephan, 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 Sankt Stephan 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 Sankt Stephan

In Sankt Stephan 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 Sankt Stephan.

Maximum UV Index Levels in Sankt Stephan for September

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

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

This table compares monthly weather conditions in Sankt Stephan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)174 mm (6.8 inches)91%moderate
February Weather-3°C (26°F)132 mm (5.2 inches)89%moderate
March Weather-1°C (31°F)161 mm (6.3 inches)87%high
April Weather3°C (37°F)99 mm (3.9 inches)84%very high
May Weather7°C (44°F)223 mm (8.8 inches)80%very high
June Weather12°C (54°F)184 mm (7.2 inches)82%extreme
July Weather13°C (56°F)224 mm (8.8 inches)82%very high
August Weather13°C (55°F)196 mm (7.7 inches)77%very high
September Weather9°C (49°F)131 mm (5.1 inches)81%high
October Weather5°C (41°F)151 mm (5.9 inches)89%high
November Weather-1°C (31°F)107 mm (4.2 inches)89%moderate
December Weather-6°C (22°F)248 mm (9.8 inches)91%low

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