Weekly swim report · August 21, 2026
Wisconsin swim report
On August 21, 2026 the warmest USGS water reading in Wisconsin was 77°F at FOX RIVER AT OIL TANK DEPOT AT GREEN BAY, WI; 1 water-related NWS hazard is active.
Warmest water
The 5 warmest of 38 sensors reporting a water temperature in Wisconsin today. Station names open the official monitoring page.
- #177°F 25°C9 hrs ago
- #2FOX RIVER AT BERLIN, WIUSGS gauge · 615 ft³/s77°F 25°C9 hrs ago
- #3LAKE MONONA AT MADISON, WIUSGS gauge76°F 24°C9 hrs ago
- #4FOX RIVER AT APPLETON, WIUSGS gauge · 1,930 ft³/s75°F 24°C9 hrs ago
- #5PESHTIGO RIVER AT PESHTIGO, WIUSGS gauge · 407 ft³/s75°F 24°C9 hrs ago
Active hazards in Wisconsin
Alerts cover counties or forecast zones — an alert for an area does not mean every river or beach inside it is affected. Times are local to the issuing office.
- Stay outSevere Thunderstorm Warning
A Severe Thunderstorm Warning is in effect for Crawford, WI; Grant, WI.
NWS La Crosse WI · until Aug 21, 3:45 PM
Where to swim in Wisconsin
The most-reviewed, well-rated water destinations in Wisconsin — check each one’s live conditions before you go.
4.7(2,640)Lake Park
Venerable lakefront park with a golf course, ball fields, nature paths, events & an 1855 lighthouse.
4.8(2,431)Dells of the Wisconsin River State Natural Area
Long gorge, formed during last ice age, where boaters can observe rock formations & cliffs by boat.
4.7(2,289)Sister Bay Beach
Bayfront area with a grassy lawn & pebbly sand, plus a pier, picnic tables & a playground.
4.6(2,181)Lake Michigan
One of the 5 Great Lakes, touching 4 U.S. states & home to Chicago, Milwaukee & Green Bay.
Get this report every Thursday
The warmest water in Wisconsin and every state, active water hazards, and where to swim this weekend — once a week. No spam — unsubscribe anytime.
Conditions are for general information only and can change quickly. Always judge the water in person and follow posted advisories and local guidance before swimming or paddling.