September Weather in Cologne, United States

Last updated: June 24, 2025

In September, the average temperature in Cologne, United States is a pleasant 18°C (64°F). However, temperatures can vary significantly, dipping to a chilly 1°C (35°F) or soaring up to a warm 32°C (91°F). Expect 117 mm (4.6 in) of precipitation over about 10 days, contributing to the region's average humidity of around 81%.

September Temperature in Cologne

In September in Cologne, the average temperature is 18°C (64°F). Maximum temperatures can reach 32°C (91°F), while minimums can drop as low as 1°C (35°F). Overall, it's a great time to visit Cologne, as you can experience a pleasant mix of warm and cooler days perfect for exploring.

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

The chart illustrates September temperature patterns in Cologne, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cologne, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (91°F) and lows dropping to around 1°C (35°F).

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

September Precipitation in Cologne

In Cologne in September, the total precipitation amount is 117 mm (4.6 in) recorded over a span of 10 days.

September Precipitation Trends in Cologne

The chart displays monthly precipitation patterns in Cologne, 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 Cologne, September typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 10 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 Cologne

In Cologne in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

September Average Humidity in Cologne

This chart illustrates the average monthly humidity levels in Cologne, 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 Cologne is approximately 81%, 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 Cologne

In Cologne 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 Cologne.

Maximum UV Index Levels in Cologne for September

The chart shows the monthly maximum UV Index (UVI) for Cologne 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 Cologne typically reaches 7, which falls under the high exposure category.

Data source: Cologne 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 Cologne Compares to Other Months

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

This table compares monthly weather conditions in Cologne, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (17°F)	29 mm (1.1 inches)	87%	low
February Weather	-9°C (17°F)	31 mm (1.2 inches)	90%	moderate
March Weather	1°C (33°F)	58 mm (2.3 inches)	85%	moderate
April Weather	6°C (43°F)	81 mm (3.2 inches)	84%	high
May Weather	15°C (59°F)	119 mm (4.7 inches)	78%	very high
June Weather	22°C (72°F)	90 mm (3.6 inches)	80%	very high
July Weather	24°C (75°F)	105 mm (4.1 inches)	81%	very high
August Weather	21°C (71°F)	145 mm (5.7 inches)	81%	very high
September Weather	18°C (64°F)	117 mm (4.6 inches)	81%	high
October Weather	9°C (49°F)	92 mm (3.6 inches)	84%	moderate
November Weather	1°C (34°F)	32 mm (1.2 inches)	88%	moderate
December Weather	-5°C (24°F)	44 mm (1.7 inches)	84%	low