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Weather in Köln for September 2025

Your guide to Köln weather in September - trends and predictions
  • In general, the average temperature in Köln at the beginning of September is 26.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.1 °C by the end of September.

  • Köln sees moderate rainfall in September, averaging 10 rainy days.

  • Is September a good time to visit Köln? check out the best time to travel to Köln page.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/14°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
64 %
Avg humidity

Köln in September average weather

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Temperatures trend during September in Köln

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
25° /14° 20.5 mm 6
2 Sept. Patchy rain possible
Patchy rain possible
28° /16° 4.8 mm 7
3 Sept. Overcast
Overcast
26° /16° 0.7 mm 6
4 Sept. Partly cloudy
Partly cloudy
23° /14° 7.4 mm 6
5 Sept. Sunny
Sunny
29° /16° 0.5 mm 7
6 Sept. Sunny
Sunny
27° /16° 0.5 mm 7
7 Sept. Sunny
Sunny
29° /15° 0 mm 8
8 Sept. Sunny
Sunny
26° /16° 0.8 mm 7
9 Sept. Sunny
Sunny
25° /16° 4.9 mm 7
10 Sept. Sunny
Sunny
25° /15° 0.4 mm 6
11 Sept. Sunny
Sunny
23° /14° 4.6 mm 6
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
21° /12° 1.7 mm 5
13 Sept. Overcast
Overcast
17° /9° 1.7 mm 4
14 Sept. Overcast
Overcast
19° /10° 0 mm 5
15 Sept. Partly cloudy
Partly cloudy
22° /10° 0 mm 6
16 Sept. Partly cloudy
Partly cloudy
22° /14° 2.7 mm 6
17 Sept. Light rain shower
Light rain shower
25° /14° 2.3 mm 6
18 Sept. Overcast
Overcast
24° /15° 1.1 mm 6
19 Sept. Partly cloudy
Partly cloudy
23° /14° 0.1 mm 6
20 Sept. Partly cloudy
Partly cloudy
24° /14° 0 mm 6
21 Sept. Light rain shower
Light rain shower
24° /13° 5.8 mm 6
22 Sept. Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
22° /12° 1.1 mm 6
23 Sept. Light rain shower
Light rain shower
18° /12° 2 mm 5
24 Sept. Partly cloudy
Partly cloudy
19° /11° 1.8 mm 5
25 Sept. Cloudy
Cloudy
19° /11° 6.2 mm 5
26 Sept. Sunny
Sunny
21° /12° 4.6 mm 5
27 Sept. Overcast
Overcast
20° /11° 1.5 mm 5
28 Sept. Cloudy
Cloudy
18° /11° 1.7 mm 4
29 Sept. Light rain shower
Light rain shower
20° /11° 1.7 mm 5
30 Sept. Partly cloudy
Partly cloudy
17° /9° 1.7 mm 5
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Important Notice
Our weather forecast for Köln in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Köln forecast closer to your planned date for the most up-to-date weather information.

Guide for Köln in September

In September, Köln, Germany experiences a transition from late summer to early autumn, bringing about noticeable changes in the weather. At the beginning of the month, Köln typically enjoys mild and pleasant conditions with average temperatures around 16°.

The days are still relatively long, providing ample opportunities for outdoor activities and sightseeing. However, occasional rainfall can be expected, so it's advisable for visitors to pack an umbrella or raincoat.

As the month progresses, the weather in Köln gradually cools down, with average temperatures dropping to around 13° by the end of September. The days become shorter, and there is a higher chance of overcast skies and intermittent showers.

Visitors should be prepared for cooler temperatures, especially in the evenings, and may want to layer clothing to stay comfortable while exploring the city.

Overall, September in Köln offers a mix of late summer warmth and early autumn coolness, making it a great time to experience the city's cultural attractions, including its renowned museums, historic landmarks, and vibrant festivals.

Köln in September - FAQ

Is September a good time to visit Köln?
Yes, September is a good time to traveling to Köln, read more about the best time to visit Köln.
What are the expected maximum and minimum temperatures in Köln during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Köln during September?
Moderate rainfall is anticipated in Köln during September, with a total of 75.2 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Köln during September?
The average wind speed in Köln during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Köln in September?

As you prepare for your trip to Köln in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Köln, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather
    • Umbrellas/Raincoats: For rainy days

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Location coordinates Where is Köln?

Get accurate weather forecasts for Köln, located at latitude 50.933 and longitude 6.95. Stay updated with localized weather information tailored for Köln.

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