Click on a day for an hourly weather forecast
The temperatures in Le Grand Bornand in September are quite cold with temperatures between 6°C and 18°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Le Grand Bornand 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 Le Grand Bornand in September 2025.
If you’re planning to visit Le Grand Bornand in the near future, we highly recommend that you review the 14 day weather forecast for Le Grand Bornand before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -7° | 7 | 10 | 14 | 84 mm | Awful | Le Grand Bornand in January |
| February | 2° / -7° | 7 | 8 | 14 | 63 mm | Awful | Le Grand Bornand in February |
| March | 6° / -3° | 7 | 14 | 10 | 65 mm | Awful | Le Grand Bornand in March |
| April | 12° / 1° | 7 | 17 | 6 | 60 mm | Awful | Le Grand Bornand in April |
| May | 15° / 4° | 10 | 20 | 1 | 113 mm | Ok | Le Grand Bornand in May |
| June | 20° / 8° | 10 | 20 | 0 | 104 mm | Ok | Le Grand Bornand in June |
| July | 22° / 9° | 7 | 24 | 0 | 87 mm | Ok | Le Grand Bornand in July |
| August | 22° / 9° | 5 | 26 | 0 | 72 mm | Good | Le Grand Bornand in August |
| September | 18° / 6° | 5 | 25 | 0 | 55 mm | Good | Le Grand Bornand in September |
| October | 14° / 3° | 4 | 25 | 2 | 46 mm | Ok | Le Grand Bornand in October |
| November | 8° / -1° | 6 | 16 | 9 | 66 mm | Bad | Le Grand Bornand in November |
| December | 3° / -5° | 6 | 14 | 12 | 88 mm | Awful | Le Grand Bornand in December |