Click on a day for an hourly weather forecast
The temperatures in Mons in September are usually low and can range between 11°C and 20°C.
You can expect about 3 to 8 days of rain in Mons 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 Mons in September 2025.
If you’re planning to visit Mons in the near future, we highly recommend that you review the 14 day weather forecast for Mons before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 1° | 10 | 16 | 5 | 106 mm | Awful | Mons in January |
| February | 7° / 1° | 9 | 15 | 4 | 90 mm | Awful | Mons in February |
| March | 11° / 3° | 8 | 21 | 2 | 84 mm | Awful | Mons in March |
| April | 15° / 5° | 5 | 25 | 1 | 62 mm | Good | Mons in April |
| May | 18° / 8° | 7 | 24 | 0 | 100 mm | Ok | Mons in May |
| June | 21° / 11° | 7 | 23 | 0 | 118 mm | Ok | Mons in June |
| July | 23° / 13° | 6 | 25 | 0 | 107 mm | Perfect | Mons in July |
| August | 23° / 14° | 6 | 25 | 0 | 105 mm | Perfect | Mons in August |
| September | 20° / 11° | 5 | 25 | 0 | 66 mm | Good | Mons in September |
| October | 15° / 8° | 7 | 24 | 0 | 82 mm | Ok | Mons in October |
| November | 10° / 5° | 8 | 21 | 1 | 104 mm | Bad | Mons in November |
| December | 7° / 2° | 10 | 18 | 3 | 122 mm | Awful | Mons in December |