Click on a day for an hourly weather forecast
The temperatures in Bialystok in September are usually low and can range between 10°C and 18°C.
You can expect about 3 to 8 days of rain in Bialystok 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 Bialystok in September 2025.
If you’re planning to visit Bialystok in the near future, we highly recommend that you review the 14 day weather forecast for Bialystok before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -5° | 6 | 5 | 21 | 75 mm | Awful | Bialystok in January |
| February | 0° / -4° | 6 | 6 | 18 | 64 mm | Awful | Bialystok in February |
| March | 6° / 0° | 7 | 13 | 12 | 61 mm | Awful | Bialystok in March |
| April | 13° / 4° | 7 | 20 | 4 | 64 mm | Awful | Bialystok in April |
| May | 18° / 8° | 8 | 23 | 0 | 129 mm | Ok | Bialystok in May |
| June | 23° / 12° | 8 | 22 | 0 | 126 mm | Good | Bialystok in June |
| July | 24° / 14° | 9 | 22 | 0 | 150 mm | Good | Bialystok in July |
| August | 24° / 14° | 6 | 25 | 0 | 90 mm | Perfect | Bialystok in August |
| September | 18° / 10° | 5 | 25 | 0 | 77 mm | Good | Bialystok in September |
| October | 12° / 5° | 6 | 24 | 1 | 74 mm | Ok | Bialystok in October |
| November | 6° / 2° | 8 | 17 | 5 | 71 mm | Awful | Bialystok in November |
| December | 1° / -2° | 8 | 8 | 16 | 77 mm | Awful | Bialystok in December |