Chimacum, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Chimacum is known for the Chimacum Valley, Chimacum Corner Farmstand, and Finnriver Farm & Cidery. The best time to travel to Chimacum, United States, is during the summer months of June to August, when the average air temperature is around 65-75°F and the water temperature is approximately 55-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!