April in Słupsk averages a daily high of 11.3°C with nights around 2.2°C. Expect roughly 8.9 wet days totalling 28.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Słupsk is June–August.
Based on LEBA, PL (45.5km), 1995–2024. 30 years of April data.