Allegan, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Allegan is known for the Allegan County Fair, which is one of the largest county fairs in Michigan. The best time to travel to Allegan, United States, is in late spring (May to June) when the average air temperature is around 60-70°F and water temperature in nearby lakes is approximately 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!