August in Słupsk averages a daily high of 21.9°C with nights around 12.5°C. Expect roughly 14 wet days totalling 84.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Słupsk is June–August.
Based on LEBA, PL (45.5km), 1995–2024. 30 years of August data.