What is the current water temperature at Lake Geneva?

Current water temperature for Lake Geneva 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 (144ft maximum).

Where is Lake Geneva located?

Lake Geneva is in Wisconsin (Walworth County), with public access near Lake Geneva, Williams Bay, Fontana-on-Geneva Lake. Surface area is 5,403 acres.

How deep is Lake Geneva?

Lake Geneva's maximum depth is 144 feet. Deeper lakes carry more thermal inertia and warm more slowly through summer; shallower lakes track the air temperature faster.

What is the water temperature at Lake Geneva WI right now?

Live and modeled water temperature is shown above. Lake Geneva warms into the mid 70s°F by July and stays swimmable through August, cooling into September.

How deep is Lake Geneva Wisconsin?

Lake Geneva reaches 144ft at its deepest point. That depth gives it strong thermal inertia. It warms slower in spring and holds warmth longer into fall than shallower Wisconsin lakes.

Wisconsin · Walworth County

Lake Geneva

Lake Geneva · Williams Bay · Fontana-on-Geneva Lake

Loading live conditions for Lake Geneva…

Surface area5,403acres

Max depth144feet

CountyWalworth

Data sourceEWMA modelAir-temp trend

Things to do

Tours & activities on Lake Geneva

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

Browse activities on Viator

Places to stay

Lake houses & rentals

Vacation rentals right on the water.

Browse rentals on Vrbo

We may earn a commission on bookings made through these links.

"Chicago's classic weekend escape — an hour and a half north and a different world. Gilded Age mansions ring the shore (the Wrigley estate, the Maytag estate), and a 21-mile public-access shore path lets you walk past most of them. Higher-end vibe than other Midwest lakes."

Seasonal pattern

When does Lake Geneva warm up?

Lake Geneva (max depth 144ft) typically reaches swim-comfortable surface temperatures (65°F+) by early to mid-June in Wisconsin. The live forecast above shows current conditions.

Field notes

About Lake Geneva

21-mile public shore path — walk past mansions all the way around
Deep (144ft) and clear by Midwest standards
Chicago-money second-home territory since the 1870s
Mailboat tour delivers mail to shoreline residents via jumping-off carrier

Surface area: 5,403 acres
Max depth: 144 ft
County: Walworth
Water data: Modeled estimate from air-temp trends