Weather in Köln for September 2025
In general, the average temperature in Köln at the beginning of September is 26.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.3 °C by the end of September.
Köln experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 82.8 mm.
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Köln in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2  27° | 3 26° | 4  25° | 5  29° | 6  27° | 7 28° |
| 8 25° | 9 25° | 10  23° | 11 23° | 12 22° | 13 19° | 14 19° |
| 15 21° | 16 20° | 17 22° | 18 21° | 19 21° | 20 21° | 21 21° |
| 22 21° | 23 20° | 24 19° | 25 20° | 26 20° | 27 18° | 28 17° |
| 29 17° | 30 17° |
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Temperatures trend during September in Köln
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Cloudy | 24° /13° | 10.2 mm | 6 | |
| 2 Sept. | Patchy rain possible | 27° /14° | 2.4 mm | 7 | |
| 3 Sept. | Patchy rain possible | 26° /15° | 0.5 mm | 6 | |
| 4 Sept. | Sunny | 25° /14° | 3.8 mm | 6 | |
| 5 Sept. | Overcast | 29° /15° | 0.2 mm | 7 | |
| 6 Sept. | Partly cloudy | 27° /16° | 0.6 mm | 7 | |
| 7 Sept. | Sunny | 28° /15° | 3.3 mm | 7 | |
| 8 Sept. | Sunny | 25° /15° | 1.9 mm | 6 | |
| 9 Sept. | Patchy rain possible | 25° /15° | 6.3 mm | 6 | |
| 10 Sept. | Moderate or heavy rain shower | 23° /14° | 5.6 mm | 5 | |
| 11 Sept. | Patchy rain possible | 23° /14° | 2.7 mm | 6 | |
| 12 Sept. | Partly cloudy | 22° /12° | 0.9 mm | 6 | |
| 13 Sept. | Sunny | 19° /11° | 3.1 mm | 5 | |
| 14 Sept. | Moderate rain at times | 19° /12° | 6.4 mm | 5 | |
| 15 Sept. | Partly cloudy | 21° /11° | 1.8 mm | 5 | |
| 16 Sept. | Patchy rain possible | 20° /13° | 1.9 mm | 5 | |
| 17 Sept. | Patchy rain possible | 22° /12° | 2.3 mm | 5 | |
| 18 Sept. | Patchy rain possible | 21° /12° | 4.5 mm | 5 | |
| 19 Sept. | Overcast | 21° /12° | 0.7 mm | 5 | |
| 20 Sept. | Cloudy | 21° /12° | 0.1 mm | 5 | |
| 21 Sept. | Sunny | 21° /11° | 2.9 mm | 5 | |
| 22 Sept. | Sunny | 21° /9° | 0.5 mm | 6 | |
| 23 Sept. | Overcast | 20° /10° | 1.1 mm | 5 | |
| 24 Sept. | Overcast | 19° /11° | 1.1 mm | 5 | |
| 25 Sept. | Sunny | 20° /11° | 3.2 mm | 5 | |
| 26 Sept. | Moderate rain at times | 20° /12° | 6.3 mm | 5 | |
| 27 Sept. | Moderate rain at times | 18° /11° | 4.4 mm | 4 | |
| 28 Sept. | Overcast | 17° /10° | 1.5 mm | 4 | |
| 29 Sept. | Overcast | 17° /9° | 1.9 mm | 4 | |
| 30 Sept. | Partly cloudy | 17° /7° | 0.9 mm | 5 | |
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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.
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Köln in September - FAQ
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
September rainfall patterns in Köln
UV exposure in Köln during September
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