South Dakota — Water Temperature Today and Throughout the Year
Discover water temperatures in South Dakota (United States), with real-time data and annual trends. Find all locations in the region and check the water temperature in them. We find every place where you can swim and show you the water temperature there today and throughout the year.
Water Temperature in Lakes and Rivers
Popular Lakes
Popular Rivers
Popular Places
Water Temperature and Swimming Overview
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Water Temperature Trends
In South Dakota, the water temperatures in rivers and lakes can vary widely depending on the season. During the summer months, rivers like the Missouri and the Big Sioux see temperatures between 70°F and 80°F (21°C to 27°C), making them suitable for activities like fishing, kayaking, and tubing. These rivers are popular for their relatively calm waters, especially in the warmer weather, though the flow can sometimes be swift in certain sections, adding an element of challenge to water sports.
Lakes in South Dakota, such as Lake Oahe, Lake Madison, and Lake Pactola, also warm up significantly during the summer. On average, the surface temperatures range from 75°F to 80°F (24°C to 27°C) in July and August, making them perfect for swimming, boating, and fishing. As the weather cools in the fall, lake temperatures can drop to around 50°F to 60°F (10°C to 16°C), which is still comfortable for some fishing activities but less ideal for recreational swimming.
Winter brings a dramatic drop in water temperatures across the state. By January, lake and river temperatures typically fall below 40°F (4°C), and ice fishing becomes a popular activity on many of the state's lakes. While these colder temperatures discourage swimming, they make the waters an excellent spot for winter sports like ice fishing and snowmobiling. South Dakota's rivers and lakes offer a variety of experiences throughout the year, depending on the season and the type of water activity.