The best time to go to Fontana, Wisconsin, is during the summer months, from June to August, when the weather is ideal for enjoying Geneva Lake and its surroundings.During this peak season, average daily temperatures range from the mid-70s to low 80s Fahrenheit, with plenty of sunshine. This weather is great for outdoor activities like boating, swimming, and golfing. The lake is fully active with water sports, and many local restaurants and shops are open with extended hours. Couples often find this period excellent for a romantic getaway, with opportunities for lakeside dining and sunset cruises.Families also appreciate the summer for its wide array of activities suitable for all ages. There are numerous family-friendly resorts offering amenities like pools, kids' clubs, and easy access to lake beaches. The warmer water temperatures make swimming comfortable, and various festivals and events are often scheduled throughout these months.If you prefer a quieter experience with pleasant weather and fewer crowds, late spring (May) or early autumn (September to early October) can also be good choices.