Click on a day for an hourly weather forecast
The temperatures in Passau in September are quite cold with temperatures between 8°C and 20°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Passau 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 Passau in September 2025.
If you’re planning to visit Passau in the near future, we highly recommend that you review the 14 day weather forecast for Passau before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -4° | 9 | 8 | 15 | 85 mm | Awful | Passau in January |
| February | 3° / -4° | 7 | 11 | 11 | 72 mm | Awful | Passau in February |
| March | 9° / 0° | 7 | 18 | 6 | 72 mm | Awful | Passau in March |
| April | 15° / 2° | 6 | 23 | 2 | 55 mm | Ok | Passau in April |
| May | 18° / 6° | 10 | 21 | 0 | 138 mm | Ok | Passau in May |
| June | 22° / 9° | 8 | 22 | 0 | 151 mm | Ok | Passau in June |
| July | 24° / 11° | 8 | 23 | 0 | 144 mm | Good | Passau in July |
| August | 24° / 11° | 7 | 24 | 0 | 109 mm | Good | Passau in August |
| September | 20° / 8° | 5 | 25 | 0 | 80 mm | Good | Passau in September |
| October | 14° / 4° | 5 | 25 | 1 | 65 mm | Good | Passau in October |
| November | 9° / 1° | 6 | 20 | 4 | 58 mm | Bad | Passau in November |
| December | 3° / -2° | 8 | 12 | 11 | 79 mm | Awful | Passau in December |