September Weather in Heiligenbrunn, Austria

Last updated: August 22, 2025

In Heiligenbrunn, Austria, the average temperature in September is a pleasant 17°C (62°F). Expect minimums around 2°C (36°F) and maximums peaking at 31°C (88°F). Rain is not uncommon, with an average precipitation of 90 mm (3.6 in) spread over 9 days. Moreover, humidity levels hover around a comfortable 65%, making it a truly delightful time of year!

September Temperature in Heiligenbrunn

In September in Heiligenbrunn, the average temperature is 17°C (62°F). The maximum can reach 31°C (88°F), while the minimum can drop as low as 2°C (36°F). Be sure to pack layers to comfortably enjoy all that Heiligenbrunn has to offer during this time!

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

The chart illustrates September temperature patterns in Heiligenbrunn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heiligenbrunn, September typically has an average temperature of 17°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Heiligenbrunn

In Heiligenbrunn in September, the precipitation amount is 90 mm (3.6 in) spread over the course of 9 days.

September Precipitation Trends in Heiligenbrunn

The chart displays monthly precipitation patterns in Heiligenbrunn, 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 Heiligenbrunn, September typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 9 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 Heiligenbrunn

In Heiligenbrunn in September, humidity is 65%. With an average temperature of 17°C (62°F), this humidity feels like a gentle wrap of warmth around you, making it a comfortable time for exploring outdoor sights, yet you might want to carry a light jacket and stay hydrated while roaming the streets.

September Average Humidity in Heiligenbrunn

This chart illustrates the average monthly humidity levels in Heiligenbrunn, 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 Heiligenbrunn is approximately 65%, 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 Heiligenbrunn

In Heiligenbrunn in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Heiligenbrunn, you can refer to this Hourly UV Index in Heiligenbrunn.

Maximum UV Index Levels in Heiligenbrunn for September

The chart shows the monthly maximum UV Index (UVI) for Heiligenbrunn 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 Heiligenbrunn typically reaches 6, which falls under the high exposure category.

Data source: Heiligenbrunn 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 Heiligenbrunn Compares to Other Months

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

This table compares monthly weather conditions in Heiligenbrunn, 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 (33°F)	28 mm (1.1 inches)	90%	low
February Weather	3°C (38°F)	40 mm (1.6 inches)	84%	moderate
March Weather	6°C (44°F)	36 mm (1.4 inches)	78%	moderate
April Weather	11°C (52°F)	45 mm (1.8 inches)	73%	high
May Weather	15°C (60°F)	106 mm (4.2 inches)	71%	very high
June Weather	21°C (70°F)	83 mm (3.3 inches)	73%	very high
July Weather	22°C (71°F)	85 mm (3.4 inches)	70%	very high
August Weather	22°C (72°F)	90 mm (3.5 inches)	60%	very high
September Weather	17°C (62°F)	90 mm (3.6 inches)	65%	high
October Weather	12°C (53°F)	53 mm (2.1 inches)	84%	moderate
November Weather	6°C (44°F)	65 mm (2.6 inches)	89%	low
December Weather	2°C (36°F)	59 mm (2.3 inches)	89%	low