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September Weather in Jaun, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Jaun, Switzerland hovers around 11°C (52°F), with a minimum of -3°C (27°F) and a maximum reaching 24°C (75°F). Expect about 117 mm (4.6 in) of precipitation, spread over 15 days. The air tends to feel quite humid, with an average humidity level of 81%.

September Temperature in Jaun

In September in Jaun, the average temperature is 11°C (52°F). Maximum temperatures can reach 24°C (75°F), while minimums can drop as low as -3°C (27°F). This varied climate makes Jaun an ideal destination for travelers seeking both mild days and chilly nights.

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

The chart illustrates September temperature patterns in Jaun, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jaun, September typically has an average temperature of 11°C (52°F), with highs reaching up to 24°C (75°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec242934414857595952443426
Data source: Temperature data for Jaun 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 Jaun

In Jaun in September, the total precipitation amount is 117 mm (4.6 in), occurring over the course of 15 days.

September Precipitation Trends in Jaun

The chart displays monthly precipitation patterns in Jaun, 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 Jaun, September typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec15011814989205181200180117135109226
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Jaun

In Jaun 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 Jaun

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

In Jaun 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 Jaun.

Maximum UV Index Levels in Jaun for September

The chart shows the monthly maximum UV Index (UVI) for Jaun 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 Jaun typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24789101097532
Data source: Jaun 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 Jaun Compares to Other Months

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

This table compares monthly weather conditions in Jaun, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)150 mm (5.9 inches)91%low
February Weather-1°C (30°F)117 mm (4.6 inches)89%moderate
March Weather1°C (34°F)149 mm (5.9 inches)87%high
April Weather5°C (41°F)89 mm (3.5 inches)84%very high
May Weather9°C (48°F)205 mm (8.1 inches)80%very high
June Weather14°C (57°F)181 mm (7.1 inches)82%very high
July Weather15°C (60°F)200 mm (7.9 inches)82%very high
August Weather15°C (59°F)180 mm (7.1 inches)77%very high
September Weather11°C (52°F)117 mm (4.6 inches)81%high
October Weather7°C (44°F)135 mm (5.3 inches)89%moderate
November Weather1°C (34°F)109 mm (4.3 inches)89%moderate
December Weather-3°C (26°F)226 mm (8.9 inches)91%low

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