September weather forecast
Cologne, Germany

Fall steps into Cologne in September with a noticeable shift in the weather. An average high temperature of 19.8°C (67.6°F) indicates the slow onset of cooler days. The arrival of autumn leaves paint the city in hues of warm gold, red and orange, a sight to behold. Nighttime temperatures play into the lovely autumnal vibe, offering cooler crescents perfect for warm drinks under the moonlit Cologne skyline. Meanwhile, fall deepens its grip with October bringing colder temperatures.

Temperature

In September, the average high-temperature marginally decreases from a moderately hot 24°C (75.2°F) in August to a comfortable 19.8°C (67.6°F). Cologne anticipates an average minimum temperature of 9.8°C (49.6°F) in the month of September.

Rainfall

In Cologne, in September, it is raining for 15 days, with typically 75mm (2.95") of accumulated precipitation. Throughout the year, in Cologne, Germany, there are 192 rainfall days, and 839mm (33.03") of precipitation is accumulated.

Daylight

In September, the average length of the day in Cologne is 12h and 38min.
On the first day of the month, sunrise is at 06:46 and sunset at 20:17. On the last day of September, sunrise is at 07:31 and sunset at 19:12 CEST.

Sunshine

The average sunshine in September in Cologne is 4.5h.

UV index

The average daily maximum UV index in September in Cologne, Germany, is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: An average UV index of 4 in September transforms into this advice:
Undertake protective steps - Recommendations to avoid sunburn are issued. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.