Click on a day for an hourly weather forecast
The temperatures in Flachau 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 Flachau 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 Flachau in September 2025.
If you’re planning to visit Flachau in the near future, we highly recommend that you review the 14 day weather forecast for Flachau before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -5° | 8 | 5 | 20 | 93 mm | Awful | Flachau in January |
| February | 2° / -4° | 6 | 7 | 16 | 75 mm | Awful | Flachau in February |
| March | 8° / -1° | 8 | 13 | 11 | 79 mm | Awful | Flachau in March |
| April | 13° / 3° | 8 | 18 | 5 | 86 mm | Awful | Flachau in April |
| May | 17° / 7° | 13 | 18 | 0 | 208 mm | Ok | Flachau in May |
| June | 21° / 10° | 12 | 18 | 0 | 247 mm | Ok | Flachau in June |
| July | 23° / 12° | 13 | 18 | 0 | 260 mm | Good | Flachau in July |
| August | 23° / 12° | 9 | 22 | 0 | 167 mm | Good | Flachau in August |
| September | 18° / 9° | 7 | 23 | 0 | 116 mm | Ok | Flachau in September |
| October | 13° / 4° | 6 | 23 | 1 | 94 mm | Ok | Flachau in October |
| November | 7° / 1° | 5 | 18 | 7 | 58 mm | Bad | Flachau in November |
| December | 2° / -3° | 9 | 9 | 14 | 81 mm | Awful | Flachau in December |