August in Bialystok is the sunniest month of the year. In August, the weather in Bialystok is typically warm. Average daily high temperature in August is about 23 degrees above zero. On average, Bialystok has 12 sunny, 12 partly cloudy, and 7 rainy days in August. The rains are usually light. August as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Bialystok.