Click on a day for an hourly weather forecast
The temperatures in Biel in September are quite cold with temperatures between 9°C and 20°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Biel 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 Biel in September 2025.
If you’re planning to visit Biel in the near future, we highly recommend that you review the 14 day weather forecast for Biel before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -4° | 9 | 10 | 12 | 134 mm | Awful | Biel in January |
| February | 4° / -3° | 10 | 9 | 11 | 113 mm | Awful | Biel in February |
| March | 9° / 0° | 7 | 17 | 6 | 104 mm | Awful | Biel in March |
| April | 14° / 3° | 8 | 20 | 2 | 110 mm | Bad | Biel in April |
| May | 18° / 6° | 11 | 20 | 0 | 189 mm | Ok | Biel in May |
| June | 22° / 10° | 11 | 19 | 0 | 193 mm | Ok | Biel in June |
| July | 24° / 12° | 10 | 21 | 0 | 180 mm | Good | Biel in July |
| August | 24° / 12° | 9 | 22 | 0 | 160 mm | Good | Biel in August |
| September | 20° / 9° | 6 | 24 | 0 | 110 mm | Good | Biel in September |
| October | 15° / 5° | 6 | 25 | 0 | 121 mm | Good | Biel in October |
| November | 9° / 2° | 8 | 18 | 4 | 128 mm | Awful | Biel in November |
| December | 4° / -2° | 11 | 12 | 9 | 171 mm | Awful | Biel in December |