North Sioux City, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. North Sioux City is known for the Dakota Dunes, a prominent residential and recreational community. The best time to travel to North Sioux City is in late spring or early fall when the average air temperature is around 60-70°F, though water temperatures in nearby rivers may be cooler, averaging 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!