Click on a day for an hourly weather forecast
The temperatures in Luxembourg in September are quite cold with temperatures between 9°C and 19°C, warm clothes are a must.
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 | 3° / -1° | 9 | 13 | 9 | 119 mm | Awful | Luxembourg in January |
| February | 5° / 0° | 8 | 11 | 9 | 98 mm | Awful | Luxembourg in February |
| March | 10° / 2° | 8 | 20 | 3 | 78 mm | Awful | Luxembourg in March |
| April | 14° / 4° | 6 | 23 | 1 | 62 mm | Good | Luxembourg in April |
| May | 17° / 7° | 8 | 23 | 0 | 114 mm | Ok | Luxembourg in May |
| June | 20° / 10° | 8 | 22 | 0 | 124 mm | Ok | Luxembourg in June |
| July | 22° / 12° | 6 | 25 | 0 | 112 mm | Good | Luxembourg in July |
| August | 22° / 12° | 6 | 25 | 0 | 101 mm | Good | Luxembourg in August |
| September | 19° / 9° | 5 | 25 | 0 | 83 mm | Good | Luxembourg in September |
| October | 14° / 6° | 7 | 24 | 0 | 89 mm | Ok | Luxembourg in October |
| November | 8° / 3° | 9 | 18 | 2 | 106 mm | Awful | Luxembourg in November |
| December | 5° / 1° | 11 | 13 | 8 | 141 mm | Awful | Luxembourg in December |