January in Białystok averages a daily high of -0.3°C with nights around -5°C. Expect roughly 16 wet days totalling 41mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Białystok is May–September.
Based on BIALYSTOK, PL (3.7km), 1995–2024. 17 years of January data.