Mission Viejo, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mission Viejo is known for its picturesque Lake Mission Viejo, offering a serene beach and recreational activities. The best time to travel to Mission Viejo is from May to October, with average air temperatures ranging from 65°F to 85°F and water temperatures around 65°F to 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!