Click on a day for an hourly weather forecast
The temperatures in Ardennen in September are quite cold with temperatures between 9°C and 18°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Ardennen 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 Ardennen in September 2025.
If you’re planning to visit Ardennen in the near future, we highly recommend that you review the 14 day weather forecast for Ardennen before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -1° | 10 | 10 | 11 | 110 mm | Awful | Ardennen in January |
| February | 5° / 0° | 8 | 11 | 9 | 87 mm | Awful | Ardennen in February |
| March | 9° / 2° | 8 | 19 | 4 | 81 mm | Awful | Ardennen in March |
| April | 13° / 4° | 5 | 23 | 1 | 62 mm | Ok | Ardennen in April |
| May | 16° / 6° | 8 | 23 | 0 | 107 mm | Ok | Ardennen in May |
| June | 20° / 10° | 7 | 23 | 0 | 111 mm | Ok | Ardennen in June |
| July | 21° / 12° | 7 | 24 | 0 | 101 mm | Ok | Ardennen in July |
| August | 22° / 12° | 5 | 26 | 0 | 93 mm | Good | Ardennen in August |
| September | 18° / 9° | 5 | 25 | 0 | 69 mm | Good | Ardennen in September |
| October | 13° / 6° | 7 | 24 | 0 | 80 mm | Bad | Ardennen in October |
| November | 8° / 3° | 10 | 17 | 3 | 100 mm | Awful | Ardennen in November |
| December | 5° / 1° | 12 | 12 | 8 | 124 mm | Awful | Ardennen in December |