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September Weather in Sirnach, Switzerland

Last updated: August 27, 2025

In Sirnach, Switzerland, the average temperature in September hovers around 15°C (60°F). Expect cool nights with a minimum of 5°C (41°F) and warm days reaching up to 27°C (82°F). During this time, anticipate 100 mm (3.9 in) of precipitation spread across 12 days, accompanied by a high average humidity of 83%. Prepare for a mix of refreshing conditions and occasional rain!

September Temperature in Sirnach

In September in Sirnach, the average temperature is 15°C (60°F), with maximums reaching 27°C (82°F) and minimums dropping as low as 5°C (41°F). This mild climate makes Sirnach an ideal destination for outdoor activities and exploring the local attractions.

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

The chart illustrates September temperature patterns in Sirnach, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sirnach, September typically has an average temperature of 15°C (60°F), with highs reaching up to 27°C (82°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec343842505666686760524237
Data source: Temperature data for Sirnach 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 Sirnach

In Sirnach in September, the precipitation amount is 100 mm (3.9 in) over the course of 12 days.

September Precipitation Trends in Sirnach

The chart displays monthly precipitation patterns in Sirnach, 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 Sirnach, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec10180906712915111113910010765127
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sirnach

In Sirnach in September humidity is 83%. With an average temperature of 15°C (60°F), this humidity feels like a damp blanket wrapping around you, making travel a bit uncomfortable and sticky, as the air clings to your skin and dampens your clothes.

September Average Humidity in Sirnach

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

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

Maximum UV Index Levels in Sirnach for September

The chart shows the monthly maximum UV Index (UVI) for Sirnach 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 Sirnach typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Sirnach 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 Sirnach Compares to Other Months

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

This table compares monthly weather conditions in Sirnach, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)101 mm (4.0 inches)92%low
February Weather3°C (38°F)80 mm (3.1 inches)89%moderate
March Weather6°C (43°F)90 mm (3.6 inches)87%moderate
April Weather10°C (50°F)67 mm (2.6 inches)84%high
May Weather13°C (56°F)129 mm (5.1 inches)80%very high
June Weather19°C (66°F)151 mm (5.9 inches)82%very high
July Weather20°C (68°F)111 mm (4.4 inches)83%very high
August Weather20°C (68°F)139 mm (5.5 inches)80%very high
September Weather15°C (60°F)100 mm (3.9 inches)83%high
October Weather11°C (52°F)107 mm (4.2 inches)90%moderate
November Weather5°C (42°F)65 mm (2.6 inches)88%low
December Weather3°C (37°F)127 mm (5.0 inches)90%low

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