May to August: May has spring flowers and fewer families; June offers the longest daylight (up to 18 hours) and comfortable 15–20°C temps; July is wa…
September and May: hotels 15–25% cheaper, still decent weather (10–18°C), fewer tourists, and the Aars Autumn Fair in September.
Go in June for the best balance of warmth, daylight, and moderate crowds, or in September if you prioritise lower costs…