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September Weather in Trachselwald, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Trachselwald, Switzerland hovers around 14°C (58°F), with daily variations that can see a minimum of 3°C (37°F) and a maximum reaching 27°C (80°F). Expect some rainfall, as precipitation averages 86 mm (3.4 in) over the course of 15 days. With an average humidity of 83%, it’s a month that balances mildness with a touch of moisture.

September Temperature in Trachselwald

In September in Trachselwald, the average temperature is 14°C (58°F), with maximums reaching up to 27°C (80°F) and minimums dropping as low as 3°C (37°F). Travelers should pack layers to comfortably enjoy a range of temperatures while exploring.

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

The chart illustrates September temperature patterns in Trachselwald, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trachselwald, September typically has an average temperature of 14°C (58°F), with highs reaching up to 27°C (80°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec323641475463656558493935
Data source: Temperature data for Trachselwald 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 Trachselwald

In Trachselwald in September, the precipitation amount is 86 mm (3.4 in) that falls over a span of 15 days.

September Precipitation Trends in Trachselwald

The chart displays monthly precipitation patterns in Trachselwald, 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 Trachselwald, September typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec10482100721401331381348611276136
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Trachselwald

In Trachselwald in September, humidity is 83%. With an average temperature of 14°C (58°F), this humidity feels like a thick blanket enveloping you, making exploration feel heavier and sweatier, so be prepared for a slower pace while traveling.

September Average Humidity in Trachselwald

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

In Trachselwald 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 Trachselwald, you can refer to this Hourly UV Index in Trachselwald.

Maximum UV Index Levels in Trachselwald for September

The chart shows the monthly maximum UV Index (UVI) for Trachselwald 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 Trachselwald typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986422
Data source: Trachselwald 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 Trachselwald Compares to Other Months

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

This table compares monthly weather conditions in Trachselwald, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)104 mm (4.1 inches)92%low
February Weather2°C (36°F)82 mm (3.2 inches)89%moderate
March Weather5°C (41°F)100 mm (3.9 inches)87%moderate
April Weather9°C (48°F)72 mm (2.8 inches)84%high
May Weather12°C (54°F)139 mm (5.5 inches)80%very high
June Weather17°C (63°F)133 mm (5.2 inches)82%very high
July Weather19°C (66°F)138 mm (5.4 inches)83%very high
August Weather18°C (65°F)134 mm (5.3 inches)80%very high
September Weather14°C (58°F)86 mm (3.4 inches)83%high
October Weather10°C (50°F)112 mm (4.4 inches)90%moderate
November Weather4°C (40°F)76 mm (3.0 inches)88%low
December Weather1°C (35°F)136 mm (5.3 inches)90%low

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