Cathlamet, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Cathlamet is known for its scenic views of the Columbia River and its charming small-town atmosphere. The best time to travel to Cathlamet, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature in nearby bodies is approximately 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!