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September Weather in Vienna, United States

Last updated: June 24, 2025

In September, the average temperature in Vienna, United States is a pleasant 26°C (80°F). However, temperatures can fluctuate, with a minimum of 13°C (56°F) and a maximum reaching up to 39°C (102°F). Expect 107 mm (4.2 in) of precipitation spread over 9 days, along with a high average humidity of 83%, making the air feel quite warm and lush.

September Temperature in Vienna

In September, in Vienna, the average temperature is 26°C (80°F). Maximum temperatures can reach 39°C (102°F), while minimum temperatures can drop as low as 13°C (56°F). This makes Vienna in September a great destination for travelers looking for warm weather, but it's advisable to prepare for both hot 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 26°C (80°F), with highs reaching up to 39°C (102°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec515761677580838280715853
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 107 mm (4.2 in), occurring over a span of 9 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 107 mm (4.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7911687110838710810310710158120
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 83%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket that can make traveling quite uncomfortable; you may find yourself needing frequent breaks for hydration and cool shade as the thick air clings 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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
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 Weather11°C (51°F)79 mm (3.1 inches)85%moderate
February Weather14°C (57°F)116 mm (4.5 inches)82%high
March Weather16°C (62°F)87 mm (3.4 inches)80%very high
April Weather19°C (67°F)110 mm (4.3 inches)76%very high
May Weather24°C (76°F)83 mm (3.3 inches)73%extreme
June Weather27°C (81°F)87 mm (3.4 inches)74%extreme
July Weather28°C (83°F)108 mm (4.2 inches)80%extreme
August Weather28°C (83°F)103 mm (4.1 inches)79%extreme
September Weather26°C (80°F)107 mm (4.2 inches)83%very high
October Weather22°C (72°F)101 mm (4.0 inches)77%very high
November Weather14°C (58°F)58 mm (2.3 inches)84%high
December Weather12°C (53°F)120 mm (4.7 inches)88%moderate

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