Banja Luka in April

Late spring through early fall works best. May and June give you mild weather and fewer crowds — perfect for walking the fortress walls without sweating through your shirt. Summer brings festivals and longer days, but temperatures can hit 35°C in July. September might be ideal. The weather stays warm, leaves start changing in Krajina Park, and restaurant terraces remain open. Plus, university students return, adding energy to the nightlife scene. Winter isn't terrible if you don't mind gray skies and early sunsets. Many attractions stay open, hotel prices drop, and you'll have places like the Cathedral practically to yourself. Just pack layers — Banja Luka gets proper cold, not the mild Mediterranean winter some Balkan cities enjoy.