The best time to go to Kostrzyn is during the summer months, particularly July and August, for the most pleasant weather and a variety of outdoor activities.During these months, the weather is generally warm and sunny, making it ideal for exploring the town's historical sites, such as the 'Old Town' of Kostrzyn, often referred to as the "Polish Pompeii" due to its preserved ruins. The Warta River and Odra River confluence is also a popular spot for relaxing and enjoying the natural surroundings.For those interested in history and outdoor exploration, the summer offers comfortable conditions for walking through the ruins, cycling along the river paths, and visiting the numerous fortifications. The longer daylight hours also allow for more extensive sightseeing.Kostrzyn is also well-known for its large music festival, usually held at the end of July or beginning of August. If you're a music enthusiast and want to experience this major event, booking your trip around this time would be perfect.