The best time to go to Illertissen is during the late spring (May to early June) and early autumn (September to early October) for pleasant weather and fewer crowds.During these months, the weather is generally mild and comfortable, ideal for exploring the town and surrounding Bavarian countryside. You'll find average temperatures ranging from 15°C to 20°C, superb for walking tours or relaxing outdoors. The spring brings blooming flowers and lush greenery, while autumn offers beautiful foliage and the start of local harvest festivals.Families might particularly enjoy visiting in May or early June. The milder temperatures are great for outdoor activities like visiting the Illertissen Castle Museum and its gardens, or exploring the nearby Illerauen, a natural riverside area superb for leisurely strolls. The school holidays haven't fully begun yet, meaning attractions are less crowded.For couples seeking a relaxed getaway, early October is an excellent choice. The crisp air and autumnal colours create a picturesque backdrop for exploring the town's historic centre, perhaps enjoying a traditional Bavarian meal at a local restaurant.