September Weather in Vienna, United States

Last updated: June 24, 2025

In September, the average temperature in Vienna, United States is 22°C (72°F), with temperatures fluctuating between a minimum of 6°C (42°F) and a maximum of 36°C (97°F). Expect about 102 mm (4.0 in) of precipitation over 11 days, accompanied by an average humidity of 75%.

September Temperature in Vienna

In September, in Vienna, the average temperature is 22°C (72°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 6°C (42°F). This makes it a great time to visit for travelers seeking warm weather while still having the option for cooler evenings.

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 22°C (72°F), with highs reaching up to 36°C (97°F) and lows dropping to around 6°C (42°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 102 mm (4.0 in) over the course of 11 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 102 mm (4.0 inches) of precipitation spread over approximately 11 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 Vienna

In Vienna in September, humidity is 75%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet requiring travelers to stay hydrated and take breaks in shaded areas.

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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, 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 (37°F)	60 mm (2.4 inches)	84%	moderate
February Weather	5°C (41°F)	98 mm (3.9 inches)	83%	moderate
March Weather	8°C (46°F)	84 mm (3.3 inches)	83%	high
April Weather	13°C (57°F)	99 mm (3.9 inches)	81%	very high
May Weather	19°C (66°F)	132 mm (5.2 inches)	78%	very high
June Weather	24°C (75°F)	118 mm (4.7 inches)	79%	very high
July Weather	27°C (81°F)	141 mm (5.5 inches)	74%	very high
August Weather	25°C (77°F)	150 mm (5.9 inches)	72%	very high
September Weather	22°C (72°F)	102 mm (4.0 inches)	75%	very high
October Weather	16°C (62°F)	107 mm (4.2 inches)	81%	high
November Weather	8°C (47°F)	86 mm (3.4 inches)	85%	moderate
December Weather	5°C (41°F)	94 mm (3.7 inches)	84%	moderate