The best time to visit Koszalin is during the summer months, from June to August, when the weather is warm and sunny, great for enjoying the Baltic Sea coast.During these months, you'll experience average temperatures ranging from 18°C to 22°C, with plenty of daylight hours. This makes it ideal for exploring the city's parks, such as the beautiful Park Książąt Pomorskich, and taking day trips to nearby beaches like Mielno. The summer also sees a variety of local events and festivals, offering a lively option.For travellers who prefer a quieter experience with pleasant weather, late spring (May) and early autumn (September) are also good options. The temperatures are milder, around 12°C to 17°C, and there are fewer crowds, particularly at the coastal resorts.