January in Słupsk averages a daily high of 2.6°C with nights around -1.5°C. Expect roughly 15.8 wet days totalling 45.3mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Słupsk is June–August.
Based on LEBA, PL (45.5km), 1995–2024. 22 years of January data.