September Weather in Vienna, United States

Last updated: June 24, 2025

In Vienna, United States, the average temperature in September hovers around 23°C (73°F), offering a pleasant climate for outdoor activities. However, temperatures can vary, with minimums of 9°C (48°F) and maximums reaching up to 36°C (97°F). Be prepared for some rain, as precipitation levels average 72 mm (2.9 in) over about 7 days, coupled with an average humidity of 75%.

September Temperature in Vienna

In September in Vienna, the average temperature is 23°C (73°F). Maximums can reach 36°C (97°F), while minimums can drop as low as 9°C (48°F). This diverse temperature range makes it essential for travelers to pack both light and warm clothing to enjoy their visit comfortably.

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

The chart illustrates September temperature patterns in Vienna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vienna, September typically has an average temperature of 23°C (73°F), with highs reaching up to 36°C (97°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Vienna

In Vienna in September, the precipitation amount is 72 mm (2.9 in) over the course of 7 days.

September Precipitation Trends in Vienna

The chart displays monthly precipitation patterns in Vienna, 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 Vienna, September typically receives around 72 mm (2.9 inches) of precipitation spread over approximately 7 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 Vienna

In Vienna in September, humidity is 75%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel slightly uncomfortable yet invigorating as the air wraps around you, creating a sense of walking through a lush, tropical paradise.

September Average Humidity in Vienna

This chart illustrates the average monthly humidity levels in Vienna, 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 Vienna is approximately 75%, 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 Vienna

In Vienna in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Vienna.

Maximum UV Index Levels in Vienna for September

The chart shows the monthly maximum UV Index (UVI) for Vienna 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 Vienna typically reaches 9, which falls under the very high exposure category.

Data source: Vienna 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 Vienna Compares to Other Months

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

This table compares monthly weather conditions in Vienna, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	102 mm (4.0 inches)	86%	moderate
February Weather	4°C (39°F)	126 mm (5.0 inches)	84%	moderate
March Weather	10°C (49°F)	153 mm (6.0 inches)	84%	high
April Weather	14°C (57°F)	140 mm (5.5 inches)	80%	very high
May Weather	20°C (68°F)	147 mm (5.8 inches)	82%	extreme
June Weather	25°C (77°F)	108 mm (4.3 inches)	83%	extreme
July Weather	27°C (80°F)	101 mm (4.0 inches)	79%	very high
August Weather	25°C (77°F)	91 mm (3.6 inches)	76%	very high
September Weather	23°C (73°F)	72 mm (2.9 inches)	75%	very high
October Weather	16°C (61°F)	132 mm (5.2 inches)	74%	high
November Weather	8°C (46°F)	96 mm (3.8 inches)	85%	moderate
December Weather	5°C (42°F)	91 mm (3.6 inches)	88%	moderate