Click on a day for an hourly weather forecast
The temperatures in Grand Est in September are comfortable with low of 11°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in Grand Est 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 Grand Est in September 2025.
If you’re planning to visit Grand Est in the near future, we highly recommend that you review the 14 day weather forecast for Grand Est before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / -1° | 8 | 14 | 9 | 88 mm | Awful | Grand Est in January |
| February | 7° / 0° | 8 | 15 | 6 | 76 mm | Awful | Grand Est in February |
| March | 12° / 3° | 6 | 22 | 3 | 63 mm | Bad | Grand Est in March |
| April | 16° / 6° | 4 | 25 | 1 | 61 mm | Good | Grand Est in April |
| May | 19° / 8° | 7 | 24 | 0 | 119 mm | Ok | Grand Est in May |
| June | 23° / 12° | 7 | 23 | 0 | 120 mm | Good | Grand Est in June |
| July | 25° / 14° | 7 | 24 | 0 | 134 mm | Good | Grand Est in July |
| August | 26° / 14° | 5 | 26 | 0 | 95 mm | Perfect | Grand Est in August |
| September | 22° / 11° | 4 | 26 | 0 | 58 mm | Good | Grand Est in September |
| October | 16° / 7° | 5 | 26 | 0 | 68 mm | Good | Grand Est in October |
| November | 10° / 4° | 6 | 22 | 2 | 78 mm | Bad | Grand Est in November |
| December | 6° / 1° | 10 | 16 | 5 | 99 mm | Awful | Grand Est in December |