Irish Valley, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Irish Valley, California, United States, is known for the Irish Valley Vineyards and the annual Irish Valley Wine Festival. The best time to travel to Irish Valley, United States, is during late spring to early fall when the average air temperature ranges from 60°F to 80°F, and water temperatures in nearby lakes and rivers are typically between 60°F and 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!