Warrenville, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Warrenville is known for the Illinois Prairie Path and the nearby Cantigny Park. The best time to travel to Warrenville, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and water temperature is approximately 55°F (13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!