January in Siedlce averages a daily high of 0.5°C with nights around -7.4°C. Expect roughly 13.9 wet days totalling 34.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Siedlce is May–September.
Based on SIEDLCE, PL (9.5km), 1995–2024. 26 years of January data.