September Weather in Trimmis, Switzerland

Last updated: August 27, 2025

In Trimmis, Switzerland, the average temperature in September hovers around 11°C (51°F). However, be prepared for chilly nights with minimums dipping to -4°C (25°F), while daytime highs can reach a pleasant 23°C (74°F). Expect precipitation around 166 mm (6.5 in) over roughly 16 days, coupled with an average humidity of 83%. Be ready for a wet and cool adventure!

September Temperature in Trimmis

In September in Trimmis, the average temperature is 11°C (51°F). The maximum can reach 23°C (74°F), while the minimum can drop as low as -4°C (25°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates September temperature patterns in Trimmis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trimmis, September typically has an average temperature of 11°C (51°F), with highs reaching up to 23°C (74°F) and lows dropping to around -4°C (25°F).

Data source: Temperature data for Trimmis generated using information from the Copernicus Climate Change Service.

September Precipitation in Trimmis

In Trimmis in September, the total precipitation amount is 166 mm (6.5 in) spread over 16 days.

September Precipitation Trends in Trimmis

The chart displays monthly precipitation patterns in Trimmis, 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 Trimmis, September typically receives around 166 mm (6.5 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Trimmis

In Trimmis in September, humidity is 83%. With an average temperature of 11°C (51°F), this humidity feels like a chilly dampness that clings to your skin, making any outdoor adventures a bit uncomfortable and best enjoyed with layered clothing and a light raincoat.

September Average Humidity in Trimmis

This chart illustrates the average monthly humidity levels in Trimmis, 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 Trimmis is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Trimmis

In Trimmis 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 Trimmis.

Maximum UV Index Levels in Trimmis for September

The chart shows the monthly maximum UV Index (UVI) for Trimmis 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 Trimmis typically reaches 7, which falls under the high exposure category.

Data source: Trimmis 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 Trimmis Compares to Other Months

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

This table compares monthly weather conditions in Trimmis, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	138 mm (5.5 inches)	92%	low
February Weather	-2°C (29°F)	94 mm (3.7 inches)	89%	moderate
March Weather	1°C (34°F)	128 mm (5.0 inches)	87%	high
April Weather	5°C (41°F)	113 mm (4.4 inches)	84%	high
May Weather	8°C (48°F)	196 mm (7.7 inches)	80%	very high
June Weather	14°C (57°F)	197 mm (7.8 inches)	82%	very high
July Weather	14°C (58°F)	212 mm (8.3 inches)	83%	very high
August Weather	14°C (58°F)	239 mm (9.4 inches)	80%	very high
September Weather	11°C (51°F)	166 mm (6.5 inches)	83%	high
October Weather	7°C (44°F)	155 mm (6.1 inches)	90%	moderate
November Weather	1°C (35°F)	99 mm (3.9 inches)	88%	moderate
December Weather	-3°C (26°F)	164 mm (6.4 inches)	90%	low