Click on a day for an hourly weather forecast
The temperatures in Grenoble 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 Grenoble 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 Grenoble in September 2025.
If you’re planning to visit Grenoble in the near future, we highly recommend that you review the 14 day weather forecast for Grenoble before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -3° | 5 | 8 | 18 | 127 mm | Awful | Grenoble in January |
| February | 3° / -3° | 6 | 7 | 16 | 105 mm | Awful | Grenoble in February |
| March | 8° / 1° | 7 | 13 | 12 | 112 mm | Awful | Grenoble in March |
| April | 12° / 4° | 7 | 17 | 6 | 103 mm | Awful | Grenoble in April |
| May | 15° / 6° | 10 | 18 | 3 | 157 mm | Bad | Grenoble in May |
| June | 19° / 10° | 10 | 20 | 0 | 150 mm | Ok | Grenoble in June |
| July | 22° / 12° | 8 | 23 | 0 | 117 mm | Ok | Grenoble in July |
| August | 22° / 12° | 6 | 25 | 0 | 101 mm | Good | Grenoble in August |
| September | 18° / 9° | 6 | 24 | 0 | 90 mm | Good | Grenoble in September |
| October | 13° / 6° | 7 | 21 | 4 | 117 mm | Awful | Grenoble in October |
| November | 8° / 2° | 6 | 14 | 10 | 141 mm | Bad | Grenoble in November |
| December | 4° / -2° | 7 | 10 | 15 | 141 mm | Awful | Grenoble in December |