Weather in Aachen for September 2025
The forecast for the first days of September 2025 in Aachen predicts a temperature of 23.6 °C, which is slightly above the historical average.
In general, the average temperature in Aachen at the beginning of September is 24.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.1 °C by the end of September.
Aachen experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 181.2 mm.
Is September a good time to visit Aachen? check out the best time to travel to Aachen page.
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Aachen Weather September
Temperatures trend during September in Aachen
September weather in Aachen day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Cloudy | 21° /10° | 0.1 mm | 3 | |
| 2 Sept. |  Sunny | 23° /11° | 0 mm | 5 | |
| 3 Sept. |  Partly cloudy | 25° /15° | 0.6 mm | 6 | |
| 4 Sept. | Cloudy | 21° /13° | 5.5 mm | 5 | |
| 5 Sept. | Sunny | 28° /14° | 1.3 mm | 7 | |
| 6 Sept. | Sunny | 26° /15° | 1 mm | 6 | |
| 7 Sept. | Sunny | 28° /14° | 0 mm | 7 | |
| 8 Sept. | Sunny | 26° /15° | 1.3 mm | 6 | |
| 9 Sept. | Partly cloudy | 24° /15° | 6.2 mm | 6 | |
| 10 Sept. | Sunny | 23° /15° | 0.9 mm | 6 | |
| 11 Sept. | Sunny | 22° /12° | 7.2 mm | 6 | |
| 12 Sept. |  Mist | 19° /10° | 2.1 mm | 5 | |
| 13 Sept. | Mist | 16° /8° | 1.6 mm | 4 | |
| 14 Sept. | Cloudy | 18° /9° | 0 mm | 5 | |
| 15 Sept. | Partly cloudy | 21° /8° | 0 mm | 6 | |
| 16 Sept. |  Patchy rain possible | 21° /13° | 1.3 mm | 5 | |
| 17 Sept. | Light rain shower | 23° /14° | 2 mm | 5 | |
| 18 Sept. |  Overcast | 23° /14° | 0.8 mm | 6 | |
| 19 Sept. | Overcast | 21° /12° | 1 mm | 5 | |
| 20 Sept. | Partly cloudy | 23° /13° | 0 mm | 6 | |
| 21 Sept. | Light rain shower | 23° /12° | 2.1 mm | 6 | |
| 22 Sept. | Light rain shower | 21° /11° | 2 mm | 5 | |
| 23 Sept. | Patchy rain possible | 17° /10° | 1.6 mm | 4 | |
| 24 Sept. | Partly cloudy | 18° /9° | 1 mm | 5 | |
| 25 Sept. | Cloudy | 18° /11° | 6.7 mm | 5 | |
| 26 Sept. | Sunny | 20° /13° | 3.4 mm | 5 | |
| 27 Sept. | Overcast | 19° /11° | 2.3 mm | 4 | |
| 28 Sept. | Partly cloudy | 17° /10° | 2.4 mm | 5 | |
| 29 Sept. | Light rain shower | 19° /9° | 0.6 mm | 4 | |
| 30 Sept. | Partly cloudy | 16° /8° | 1.5 mm | 4 | |
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Aachen weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Light rain shower | Patchy rain possible |
| Temperatures | 27°/12° | 24°/10° | 18°/7° |
| Rainfall | 229 mm | 181 mm | 186 mm |
| Wind | 18.2 km/h | 18.6 km/h | 21.7 km/h |
| Humidity | 70% | 72% | 79% |
| Rainy days | 13 days | 6 days | 7 days |
| Dry days | 18 days | 24 days | 24 days |
Planning a trip to Aachen? Discover the best time to visit
Aachen in September - FAQ
What to pack to Aachen in September?
As you prepare for your trip to Aachen 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 Aachen, 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 Aachen
UV exposure in Aachen during September
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Where is Aachen?Get accurate weather forecasts for Aachen, located at latitude 50.777 and longitude 6.083. Stay updated with localized weather information tailored for Aachen.