September Weather in Untersee, Austria

Last updated: August 22, 2025

In September, the average temperature in Untersee, Austria hovers around 10°C (51°F). While you may experience a brisk minimum of -8°C (18°F), the days can warm up to a pleasant 26°C (79°F). Be prepared for precipitation averaging 164 mm (6.5 in) over 16 days, and don’t forget to account for the average humidity level of 74%. Whether you prefer a cozy indoor setting or outdoor adventures, this month offers a diverse weather experience!

September Temperature in Untersee

In September in Untersee, the average temperature is 10°C (51°F). Maximums can reach 26°C (79°F), while minimums can drop as low as -8°C (18°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates September temperature patterns in Untersee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Untersee, September typically has an average temperature of 10°C (51°F), with highs reaching up to 26°C (79°F) and lows dropping to around -8°C (18°F).

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

September Precipitation in Untersee

In Untersee in September, the total precipitation amount is 164 mm (6.5 in), spread over 16 days.

September Precipitation Trends in Untersee

The chart displays monthly precipitation patterns in Untersee, 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 Untersee, September typically receives around 164 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.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Untersee

In Untersee in September humidity is 74%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill enveloping you, making travel a bit uncomfortable as the cold air clings to your skin, and you may find yourself wishing you had packed an extra layer to stay warm and dry.

September Average Humidity in Untersee

This chart illustrates the average monthly humidity levels in Untersee, 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 Untersee is approximately 74%, 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 Untersee

In Untersee 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 Untersee.

Maximum UV Index Levels in Untersee for September

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

Data source: Untersee 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 Untersee Compares to Other Months

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

This table compares monthly weather conditions in Untersee, 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 (23°F)	127 mm (5.0 inches)	91%	low
February Weather	-3°C (28°F)	105 mm (4.1 inches)	87%	moderate
March Weather	0°C (32°F)	120 mm (4.7 inches)	82%	high
April Weather	4°C (40°F)	99 mm (3.9 inches)	79%	high
May Weather	8°C (47°F)	210 mm (8.2 inches)	74%	very high
June Weather	14°C (58°F)	172 mm (6.8 inches)	75%	very high
July Weather	14°C (58°F)	205 mm (8.1 inches)	74%	very high
August Weather	15°C (59°F)	205 mm (8.1 inches)	68%	very high
September Weather	10°C (51°F)	164 mm (6.5 inches)	74%	high
October Weather	6°C (43°F)	136 mm (5.4 inches)	88%	moderate
November Weather	1°C (34°F)	97 mm (3.8 inches)	90%	moderate
December Weather	-4°C (26°F)	161 mm (6.4 inches)	89%	low