Click on a day for an hourly weather forecast
The temperatures in Luxembourg in September are usually low and can range between 10°C and 19°C.
You can expect about 3 to 8 days of rain in Luxembourg during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Luxembourg in September 2025.
If you’re planning to visit Luxembourg in the near future, we highly recommend that you review the 14 day weather forecast for Luxembourg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -1° | 9 | 11 | 11 | 118 mm | Awful | Luxembourg in January |
| February | 5° / 0° | 9 | 10 | 10 | 97 mm | Awful | Luxembourg in February |
| March | 10° / 2° | 8 | 19 | 4 | 80 mm | Awful | Luxembourg in March |
| April | 14° / 5° | 6 | 23 | 1 | 77 mm | Good | Luxembourg in April |
| May | 17° / 7° | 8 | 23 | 0 | 139 mm | Ok | Luxembourg in May |
| June | 20° / 11° | 8 | 22 | 0 | 146 mm | Ok | Luxembourg in June |
| July | 23° / 13° | 7 | 24 | 0 | 125 mm | Good | Luxembourg in July |
| August | 23° / 13° | 5 | 26 | 0 | 95 mm | Perfect | Luxembourg in August |
| September | 19° / 10° | 5 | 25 | 0 | 80 mm | Good | Luxembourg in September |
| October | 14° / 6° | 7 | 24 | 0 | 93 mm | Ok | Luxembourg in October |
| November | 8° / 3° | 9 | 18 | 3 | 111 mm | Awful | Luxembourg in November |
| December | 5° / 1° | 11 | 11 | 9 | 147 mm | Awful | Luxembourg in December |