September Weather in Vienna, United States

Last updated: June 24, 2025

In September, the average temperature in Vienna, United States hovers around 17°C (62°F), creating a comfortable climate for visitors. Expect a minimum of 1°C (34°F) and a maximum soaring to 31°C (87°F). While you're there, be prepared for some rain, as the area experiences approximately 70 mm (2.7 in) of precipitation over 7 days. With an average humidity of 77%, it's a good idea to stay hydrated and enjoy the lush surroundings!

September Temperature in Vienna

In September in Vienna, the average temperature is 17°C (62°F), with maximums reaching 31°C (87°F) and minimums dropping as low as 1°C (34°F). This variation in temperature makes Vienna an ideal destination for travelers seeking both warm and cool experiences during their visit.

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 17°C (62°F), with highs reaching up to 31°C (87°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec212330435565706962503625
Data source: Temperature data for Vienna generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Vienna

In Vienna in September, the precipitation amount is 70 mm (2.7 in) over a period 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 70 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec83847312183741218370127110113
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Vienna

In Vienna in September humidity is 77%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, creating a lush, almost tropical atmosphere that can be quite stifling for traveling, making it essential to stay hydrated and take frequent breaks in the shade.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
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 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 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910987532
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.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)83 mm (3.2 inches)91%low
February Weather-5°C (23°F)84 mm (3.3 inches)89%moderate
March Weather-1°C (31°F)72 mm (2.9 inches)85%moderate
April Weather6°C (43°F)121 mm (4.8 inches)84%very high
May Weather13°C (55°F)83 mm (3.3 inches)78%very high
June Weather18°C (65°F)74 mm (2.9 inches)72%very high
July Weather21°C (70°F)121 mm (4.7 inches)75%very high
August Weather21°C (69°F)82 mm (3.2 inches)74%very high
September Weather17°C (62°F)70 mm (2.7 inches)77%high
October Weather10°C (50°F)127 mm (5.0 inches)85%moderate
November Weather2°C (36°F)110 mm (4.3 inches)86%moderate
December Weather-4°C (26°F)113 mm (4.4 inches)85%low

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