September Weather in Giessen, Germany

Last updated: August 23, 2025

In September, the average temperature in Giessen, Germany is a pleasant 15°C (60°F), with temperatures ranging from a cool 3°C (37°F) to a warm 33°C (91°F). Expect about 41 mm (1.6 in) of precipitation spread over 7 days, and enjoy the high average humidity of 82% that adds to the region's unique atmosphere.

September Temperature in Giessen

In September in Giessen, the average temperature is 15°C (60°F). Maximums can reach 33°C (91°F) and minimums can be as low as 3°C (37°F). This variability makes it advisable for travelers to pack layers to accommodate both warm and cooler conditions.

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

The chart illustrates September temperature patterns in Giessen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Giessen, September typically has an average temperature of 15°C (60°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (37°F).

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

September Precipitation in Giessen

In Giessen in September, the precipitation amount is 41 mm (1.6 in) spread over a duration of 7 days.

September Precipitation Trends in Giessen

The chart displays monthly precipitation patterns in Giessen, 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 Giessen, September typically receives around 41 mm (1.6 inches) of precipitation spread over approximately 7 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 Giessen

In Giessen in September humidity is 82%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and draining, which can hinder your travel experience.

September Average Humidity in Giessen

This chart illustrates the average monthly humidity levels in Giessen, 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 Giessen is approximately 82%, 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 Giessen

In Giessen in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Giessen.

Maximum UV Index Levels in Giessen for September

The chart shows the monthly maximum UV Index (UVI) for Giessen 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 Giessen typically reaches 5, which falls under the moderate exposure category.

Data source: Giessen 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 Giessen Compares to Other Months

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

This table compares monthly weather conditions in Giessen, 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 (36°F)	62 mm (2.4 inches)	92%	low
February Weather	3°C (38°F)	54 mm (2.1 inches)	90%	low
March Weather	6°C (43°F)	66 mm (2.6 inches)	87%	moderate
April Weather	10°C (50°F)	36 mm (1.4 inches)	83%	moderate
May Weather	13°C (56°F)	73 mm (2.9 inches)	76%	high
June Weather	19°C (66°F)	64 mm (2.5 inches)	74%	very high
July Weather	19°C (67°F)	68 mm (2.7 inches)	74%	very high
August Weather	20°C (67°F)	64 mm (2.5 inches)	75%	high
September Weather	15°C (60°F)	41 mm (1.6 inches)	82%	moderate
October Weather	11°C (52°F)	54 mm (2.1 inches)	88%	moderate
November Weather	6°C (42°F)	47 mm (1.9 inches)	90%	low
December Weather	4°C (39°F)	95 mm (3.7 inches)	92%	low