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The temperatures in Klagenfurt in September are quite cold with temperatures between 6°C and 20°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Klagenfurt 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 Klagenfurt in September 2025.
If you’re planning to visit Klagenfurt in the near future, we highly recommend that you review the 14 day weather forecast for Klagenfurt before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -8° | 7 | 12 | 13 | 71 mm | Awful | Klagenfurt in January |
| February | 4° / -7° | 7 | 10 | 12 | 108 mm | Awful | Klagenfurt in February |
| March | 9° / -3° | 7 | 18 | 6 | 86 mm | Awful | Klagenfurt in March |
| April | 14° / 1° | 8 | 20 | 2 | 105 mm | Bad | Klagenfurt in April |
| May | 19° / 4° | 13 | 18 | 0 | 174 mm | Ok | Klagenfurt in May |
| June | 24° / 7° | 10 | 20 | 0 | 161 mm | Good | Klagenfurt in June |
| July | 26° / 9° | 11 | 20 | 0 | 153 mm | Good | Klagenfurt in July |
| August | 25° / 9° | 9 | 22 | 0 | 165 mm | Good | Klagenfurt in August |
| September | 20° / 6° | 7 | 23 | 0 | 153 mm | Ok | Klagenfurt in September |
| October | 15° / 2° | 6 | 25 | 0 | 110 mm | Good | Klagenfurt in October |
| November | 9° / -1° | 8 | 19 | 2 | 141 mm | Awful | Klagenfurt in November |
| December | 3° / -6° | 6 | 17 | 8 | 87 mm | Awful | Klagenfurt in December |