May in Banja Luka averages a daily high of 23.9°C with nights around 10.7°C. Expect roughly 13.5 wet days totalling 101.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Banja Luka is April–June.
Based on BANJA LUKA, BK (1km), 1995–2024. 12 years of May data.