The best time to visit Horn is during late spring, summer, or early autumn, specifically from May to September, when the weather is most pleasant for outdoor activities and exploring the region.During these months, you'll experience warmer temperatures, typically ranging from 15°C to 25°C, making it ideal for enjoying Lake Constance, hiking, or cycling along the many scenic routes. The longer daylight hours also mean more time for sightseeing and leisurely evenings by the lake.For those interested in watersports or simply relaxing by the lake, July and August offer the warmest water temperatures and the most sunshine. This period is also when many local festivals and events take place, adding to the holiday atmosphere.If you prefer slightly cooler temperatures and fewer crowds, May, June, and September are excellent choices.