Click on a day for an hourly weather forecast
The temperatures in Viseu in September are comfortable with low of 14°C and and high up to 27°C.
You can expect about 3 to 8 days of rain in Viseu 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 Viseu in September 2025.
If you’re planning to visit Viseu in the near future, we highly recommend that you review the 14 day weather forecast for Viseu before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 11° / 3° | 8 | 22 | 1 | 165 mm | Bad | Viseu in January |
| February | 12° / 4° | 8 | 20 | 1 | 159 mm | Bad | Viseu in February |
| March | 15° / 5° | 8 | 23 | 0 | 128 mm | Ok | Viseu in March |
| April | 17° / 7° | 8 | 22 | 0 | 110 mm | Ok | Viseu in April |
| May | 22° / 10° | 5 | 26 | 0 | 67 mm | Good | Viseu in May |
| June | 25° / 12° | 3 | 27 | 0 | 42 mm | Perfect | Viseu in June |
| July | 30° / 14° | 1 | 30 | 0 | 12 mm | Good | Viseu in July |
| August | 30° / 15° | 1 | 30 | 0 | 12 mm | Good | Viseu in August |
| September | 27° / 14° | 4 | 26 | 0 | 55 mm | Perfect | Viseu in September |
| October | 21° / 11° | 6 | 25 | 0 | 139 mm | Good | Viseu in October |
| November | 14° / 7° | 8 | 22 | 0 | 144 mm | Ok | Viseu in November |
| December | 12° / 5° | 8 | 22 | 0 | 183 mm | Bad | Viseu in December |