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September Weather in Knonau, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Knonau, Switzerland hovers around 16°C (60°F). Expect a range from a cool 5°C (41°F) to a warm 28°C (83°F). This month also brings 104 mm (4.1 in) of precipitation over approximately 11 days, contributing to a high average humidity of 83%. Prepare for a blend of comfortable warmth and occasional showers!

September Temperature in Knonau

In September in Knonau, the average temperature is 16°C (60°F). Maximums can reach 28°C (83°F), while minimums can dip to as low as 5°C (41°F). This makes it a great time for travelers who enjoy mild weather and outdoor activities.

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

The chart illustrates September temperature patterns in Knonau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Knonau, September typically has an average temperature of 16°C (60°F), with highs reaching up to 28°C (83°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec353943505665676760524238
Data source: Temperature data for Knonau 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 Knonau

In Knonau in September, the precipitation amount is 104 mm (4.1 in) over the course of 11 days.

September Precipitation Trends in Knonau

The chart displays monthly precipitation patterns in Knonau, 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 Knonau, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec112871007713714913414110512276136
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Knonau

In Knonau in September humidity is 83%. With an average temperature of 16°C (60°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit uncomfortable for traveling.

September Average Humidity in Knonau

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

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

Maximum UV Index Levels in Knonau for September

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

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

This table compares monthly weather conditions in Knonau, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)112 mm (4.4 inches)92%low
February Weather4°C (39°F)87 mm (3.4 inches)89%moderate
March Weather6°C (43°F)100 mm (3.9 inches)87%moderate
April Weather10°C (50°F)77 mm (3.0 inches)84%high
May Weather13°C (56°F)137 mm (5.4 inches)80%very high
June Weather18°C (65°F)149 mm (5.9 inches)82%very high
July Weather20°C (68°F)134 mm (5.3 inches)83%very high
August Weather20°C (67°F)141 mm (5.6 inches)80%very high
September Weather16°C (60°F)104 mm (4.1 inches)83%high
October Weather11°C (52°F)122 mm (4.8 inches)90%moderate
November Weather6°C (43°F)76 mm (3.0 inches)88%moderate
December Weather3°C (38°F)136 mm (5.4 inches)90%low

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