Byron, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Byron, Illinois, United States, is not particularly known for travel and beach tourism. The best time to travel to Byron, United States, is during late spring to early fall (May to September) when the average air temperature ranges from 60°F to 85°F and water temperature is around 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!