September Weather in Vienna, United States

Last updated: June 24, 2025

In September, the average temperature in Vienna, United States hovers around 22°C (73°F), offering a pleasant climate. However, temperatures can vary significantly, with minimums reaching 7°C (45°F) and maximums soaring to 35°C (96°F). Expect some rainfall, with an average precipitation of 51 mm (2.0 in) spread over 6 days. The air remains quite humid, with an average humidity level of 76%, making it ideal for those who enjoy a lush, vibrant atmosphere.

September Temperature in Vienna

In September in Vienna, the average temperature is 22°C (73°F). Maximums can reach 35°C (96°F), while minimums can dip as low as 7°C (45°F). This makes Vienna an ideal destination for travelers seeking a mix of warm days and 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 (73°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (45°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 51 mm (2.0 in) over the course of 6 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 51 mm (2.0 inches) of precipitation spread over approximately 6 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 76%. With an average temperature of 22°C (73°F), this humidity feels like a warm embrace that envelops you, making travel both refreshing and slightly steamy, as the air clings warmly to your skin.

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 76%, 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	1°C (34°F)	75 mm (3.0 inches)	82%	moderate
February Weather	2°C (36°F)	76 mm (3.0 inches)	80%	moderate
March Weather	9°C (48°F)	129 mm (5.1 inches)	80%	high
April Weather	13°C (55°F)	129 mm (5.1 inches)	80%	very high
May Weather	19°C (66°F)	166 mm (6.5 inches)	82%	very high
June Weather	24°C (76°F)	87 mm (3.4 inches)	83%	extreme
July Weather	26°C (80°F)	97 mm (3.8 inches)	81%	extreme
August Weather	25°C (77°F)	95 mm (3.7 inches)	80%	very high
September Weather	22°C (73°F)	51 mm (2.0 inches)	76%	very high
October Weather	15°C (59°F)	102 mm (4.0 inches)	76%	high
November Weather	7°C (45°F)	62 mm (2.4 inches)	85%	moderate
December Weather	4°C (40°F)	47 mm (1.9 inches)	86%	moderate