nomadseason

September Weather in Vionnaz, Switzerland

Last updated: August 27, 2025

In Vionnaz, Switzerland during September, the average temperature hovers around 11°C (52°F). You can expect temperatures to range from a chilly -5°C (24°F) to a pleasant 23°C (74°F). Rainfall is not unusual, with an average precipitation amount of 120 mm (4.7 in) spread over 15 days. Humidity levels are notably high, averaging at 81%, contributing to the overall atmosphere of the season.

September Temperature in Vionnaz

In September in Vionnaz, the average temperature is 11°C (52°F). The maximum can reach 23°C (74°F), while the minimum can drop as low as -5°C (24°F). This wide range of temperatures makes it essential to pack layers and be prepared for varying weather conditions while traveling.

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

The chart illustrates September temperature patterns in Vionnaz, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vionnaz, September typically has an average temperature of 11°C (52°F), with highs reaching up to 23°C (74°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec212833414756595851443324
Data source: Temperature data for Vionnaz 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 Vionnaz

In Vionnaz in September, the precipitation amount is 120 mm (4.7 in) spread over 15 days.

September Precipitation Trends in Vionnaz

The chart displays monthly precipitation patterns in Vionnaz, 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 Vionnaz, September typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec13811514290211211207189120127105228
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Vionnaz

In Vionnaz in September humidity is 81%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that can make outdoor excursions quite uncomfortable, causing a muggy heaviness that dampens clothes and leaves travelers longing for dryer weather.

September Average Humidity in Vionnaz

This chart illustrates the average monthly humidity levels in Vionnaz, 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 Vionnaz 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 Vionnaz

In Vionnaz 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 Vionnaz.

Maximum UV Index Levels in Vionnaz for September

The chart shows the monthly maximum UV Index (UVI) for Vionnaz 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 Vionnaz typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467810997532
Data source: Vionnaz 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 Vionnaz Compares to Other Months

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

This table compares monthly weather conditions in Vionnaz, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)138 mm (5.4 inches)91%low
February Weather-2°C (29°F)115 mm (4.5 inches)89%moderate
March Weather1°C (34°F)142 mm (5.6 inches)87%high
April Weather5°C (41°F)90 mm (3.5 inches)84%high
May Weather8°C (47°F)211 mm (8.3 inches)80%very high
June Weather13°C (56°F)211 mm (8.3 inches)82%very high
July Weather15°C (59°F)206 mm (8.1 inches)82%very high
August Weather14°C (58°F)189 mm (7.4 inches)77%very high
September Weather11°C (52°F)120 mm (4.7 inches)81%high
October Weather7°C (44°F)127 mm (5.0 inches)89%moderate
November Weather1°C (33°F)105 mm (4.1 inches)89%moderate
December Weather-4°C (24°F)228 mm (9.0 inches)91%low

Compare Vionnaz's Climate with Cities Worldwide