Weather in Luxembourg for September 2025
Until now, September 2025 in Luxembourg is cooler than usual, with temperatures averaging 19.1 °C, this is -2.4 °C below the typical seasonal average.
The forecast for the next days in Luxembourg predicts a temperature of 15.2 °C, which is cooler than the historical average.
In general, the average temperature in Luxembourg at the beginning of September is 23.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.4 °C by the end of September.
Luxembourg in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 71.4 mm.
Temperatures
Rain 🌧️
Luxembourg Weather September
Temperatures trend during September in Luxembourg
September weather in Luxembourg day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 22° /13° | 5 mm | 5 | |
| 2 Sept. | Light rain shower | 23° /14° | 1.3 mm | 5 | |
| 3 Sept. | Patchy rain possible | 24° /14° | 2.8 mm | 5 | |
| 4 Sept. | Light rain shower | 21° /13° | 5.2 mm | 5 | |
| 5 Sept. |  Sunny | 23° /12° | 1.2 mm | 5 | |
| 6 Sept. | Sunny | 23° /12° | 2.1 mm | 5 | |
| 7 Sept. | Sunny | 27° /12° | 0.5 mm | 7 | |
| 8 Sept. | Sunny | 24° /14° | 2.6 mm | 6 | |
| 9 Sept. | Light rain shower | 20° /13° | 4 mm | 5 | |
| 10 Sept. | Sunny | 22° /12° | 0.9 mm | 5 | |
| 11 Sept. | Sunny | 20° /11° | 3.1 mm | 5 | |
| 12 Sept. | Light rain shower | 19° /9° | 3.6 mm | 4 | |
| 13 Sept. | Light rain shower | 16° /8° | 3.2 mm | 4 | |
| 14 Sept. |  Cloudy | 18° /9° | 0.4 mm | 4 | |
| 15 Sept. |  Partly cloudy | 20° /9° | 0.6 mm | 5 | |
| 16 Sept. | Patchy rain possible | 15° /10° | 1.2 mm | 0.8 | |
| 17 Sept. | Partly cloudy | 15° /8° | 0 mm | 0.2 | |
| 18 Sept. | Sunny | 22° /11° | 0 mm | 1.2 | |
| 19 Sept. | Sunny | 25° /12° | 0 mm | 1.1 | |
| 20 Sept. | Sunny | 24° /15° | 0 mm | 1.1 | |
| 21 Sept. | Patchy rain possible | 16° /11° | 0.6 mm | 3 | |
| 22 Sept. | Partly cloudy | 15° /10° | 0 mm | 4 | |
| 23 Sept. | Patchy rain possible | 11° /8° | 1.1 mm | 2 | |
| 24 Sept. | Patchy rain possible | 13° /6° | 0.6 mm | 2 | |
| 25 Sept. | Patchy rain possible | 11° /6° | 1.1 mm | 2 | |
| 26 Sept. | Patchy rain possible | 13° /7° | 0.5 mm | 3 | |
| 27 Sept. | Patchy rain possible | 13° /9° | 1.7 mm | 3 | |
| 28 Sept. | Patchy rain possible | 11° /10° | 3.6 mm | 3 | |
| 29 Sept. |  Moderate rain | 9° /9° | 6.7 mm | 2 | |
| 30 Sept. | Sunny | 17° /7° | 0.4 mm | 4 | |
| Next | |||||
Guide for Luxembourg in September
In September, Luxembourg experiences a transition from the late summer to early autumn weather. At the beginning of the month, the weather in Luxembourg is generally mild and pleasant, with average temperatures ranging from 15° to 20°.
The days are still relatively long, providing ample opportunity for outdoor activities and sightseeing. However, occasional rainfall can be expected, so it's advisable to carry an umbrella or light raincoat.
As the month progresses towards the end, the temperatures in Luxembourg start to gradually decrease. By the end of September, the average temperatures typically range from 10° to 15°. The days become shorter, and there is a noticeable crispness in the air as autumn takes hold.
Visitors can witness the stunning transformation of the city's foliage, as the leaves begin to change color, creating a picturesque setting for leisurely strolls through the parks and gardens.
Overall, September in Luxembourg offers a delightful blend of lingering warmth and the onset of autumnal charm, making it an ideal time to explore the city's cultural attractions and natural beauty.
Luxembourg in September - FAQ
September rainfall patterns in Luxembourg
UV exposure in Luxembourg during September
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