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September Weather in Walchwil, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Walchwil, Switzerland is a crisp 13°C (56°F). Visitors can expect a temperature range from a chilly 1°C (34°F) to a warm 25°C (77°F). During this time, the area receives about 146 mm (5.8 in) of precipitation spread over 15 days, with humidity levels lingering around 83%. Be prepared for a mix of weather while enjoying the beauty of this destination!

September Temperature in Walchwil

In September in Walchwil, the average temperature is 13°C (56°F). The maximum can reach 25°C (77°F), and the minimum can be as low as 1°C (34°F). This makes it a perfect time for travelers to enjoy mild weather while exploring the sights.

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

The chart illustrates September temperature patterns in Walchwil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walchwil, September typically has an average temperature of 13°C (56°F), with highs reaching up to 25°C (77°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec303438445160636356483933
Data source: Temperature data for Walchwil 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 Walchwil

In Walchwil in September, the precipitation amount is 146 mm (5.8 in) spread over 15 days, indicating a relatively wet period during that time.

September Precipitation Trends in Walchwil

The chart displays monthly precipitation patterns in Walchwil, 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 Walchwil, September typically receives around 146 mm (5.8 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec144106127104163189190203146165102171
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Walchwil

In Walchwil in September humidity is 83%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making travel a bit uncomfortable as the air feels heavy and the moisture clings to your skin.

September Average Humidity in Walchwil

This chart illustrates the average monthly humidity levels in Walchwil, 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 Walchwil is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%89%87%84%80%82%83%80%83%90%89%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Walchwil

In Walchwil in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Walchwil, you can refer to this Hourly UV Index in Walchwil.

Maximum UV Index Levels in Walchwil for September

The chart shows the monthly maximum UV Index (UVI) for Walchwil 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 Walchwil typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986432
Data source: Walchwil 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 Walchwil Compares to Other Months

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

This table compares monthly weather conditions in Walchwil, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)144 mm (5.7 inches)92%low
February Weather1°C (34°F)106 mm (4.2 inches)89%moderate
March Weather3°C (38°F)127 mm (5.0 inches)87%moderate
April Weather7°C (45°F)104 mm (4.1 inches)84%high
May Weather10°C (51°F)163 mm (6.4 inches)80%very high
June Weather16°C (60°F)189 mm (7.4 inches)82%very high
July Weather17°C (63°F)190 mm (7.5 inches)83%very high
August Weather17°C (63°F)203 mm (8.0 inches)80%very high
September Weather13°C (56°F)146 mm (5.8 inches)83%high
October Weather9°C (49°F)165 mm (6.5 inches)90%moderate
November Weather4°C (39°F)102 mm (4.0 inches)88%moderate
December Weather1°C (33°F)171 mm (6.7 inches)90%low

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