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.
Temperatures
18° / 10°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
77
mm
Sun Hours
9.5
Hrs
