July in Słupsk averages a daily high of 21.6°C with nights around 12.7°C. Expect roughly 12.8 wet days totalling 77.3mm. 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 July data.