What is the current water temperature at Lake Winnebago?

Current water temperature for Lake Winnebago is shown in the live forecast above. Most Wisconsin lakes have no public real-time water-temperature sensor, so we estimate from recent and forecast air-temperature trends weighted by the lake's depth (21ft maximum).

Where is Lake Winnebago located?

Lake Winnebago is in Wisconsin (Calumet / Winnebago / Fond du Lac County), with public access near Oshkosh, Neenah, Fond du Lac, Menasha. Surface area is 137,708 acres.

How deep is Lake Winnebago?

Lake Winnebago's maximum depth is 21 feet. Deeper lakes carry more thermal inertia and warm more slowly through summer; shallower lakes track the air temperature faster.

Wisconsin · Calumet / Winnebago / Fond du Lac County

Lake Winnebago

Oshkosh · Neenah · Fond du Lac · Menasha

Loading live conditions for Lake Winnebago…

Surface area137,708acres

Max depth21feet

CountyCalumet / Winnebago / Fond du Lac

Data sourceEWMA modelAir-temp trend

Things to do

Tours & activities on Lake Winnebago

Boat cruises, fishing trips, kayak rentals, and guided adventures from local operators.

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Places to stay

Lake houses & rentals

Vacation rentals right on the water.

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"Wisconsin's largest inland lake by area — and one of the shallowest big lakes in the US (just 21ft max). Famous worldwide for its lake sturgeon, including a winter spear-fishing season tied to a specific quota each year. Warm-water fishing, sailing, and the EAA AirVenture fly-in at Oshkosh."

Seasonal pattern

When does Lake Winnebago warm up?

Lake Winnebago is shallow (max depth 21ft), so it warms early — surface temperatures typically reach swimming range (65°F+) by mid- to late-May in most years. Live forecast above shows current conditions.

Field notes

About Lake Winnebago

Largest inland lake in Wisconsin
Very shallow — warms early and quickly
Hosts the famous winter lake-sturgeon spear-fishing season
EAA AirVenture fly-in happens lakeside at Oshkosh every July

Surface area: 137,708 acres
Max depth: 21 ft
County: Calumet / Winnebago / Fond du Lac
Water data: Modeled estimate from air-temp trends