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The temperatures in Upper Austria in September are quite cold with temperatures between 5°C and 15°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Upper Austria. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Please note that Upper Austria can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Upper Austria in September 2025.
If you’re planning to visit Upper Austria in the near future, we highly recommend that you review the 14 day weather forecast for Upper Austria before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -9° | 4 | 5 | 22 | 217 mm | Awful | Upper Austria in January |
| February | -1° / -9° | 4 | 4 | 22 | 159 mm | Awful | Upper Austria in February |
| March | 3° / -6° | 5 | 6 | 21 | 176 mm | Awful | Upper Austria in March |
| April | 9° / -1° | 9 | 8 | 13 | 147 mm | Awful | Upper Austria in April |
| May | 13° / 3° | 17 | 7 | 7 | 290 mm | Awful | Upper Austria in May |
| June | 17° / 6° | 18 | 12 | 0 | 296 mm | Ok | Upper Austria in June |
| July | 19° / 8° | 17 | 14 | 0 | 278 mm | Ok | Upper Austria in July |
| August | 20° / 8° | 14 | 17 | 0 | 262 mm | Ok | Upper Austria in August |
| September | 15° / 5° | 11 | 17 | 2 | 199 mm | Bad | Upper Austria in September |
| October | 10° / 1° | 7 | 16 | 8 | 180 mm | Awful | Upper Austria in October |
| November | 6° / -2° | 4 | 14 | 12 | 122 mm | Awful | Upper Austria in November |
| December | 0° / -6° | 4 | 7 | 20 | 177 mm | Awful | Upper Austria in December |
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