Lake Monona at Madison, Wisconsin water temperature

Lake Monona at Madison, Wisconsin · Lake

The current water temperature at Lake Monona at Madison is 23.6 °C (as of September 1, 2026, source: USGS).

Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.

23.6 °C

Measured: September 1, 2026 · continuously updated

💧 Water 23.6° · ☀️ Air 26.7° · high today 30.2°

Temperature trend of recent weeks

Lake Monona at Madison, Wisconsin — Photo: Chris Rycroft from Madison, Wisconsin, United States · CC BY 2.0 · Wikimedia Commons

Measurement series & statistics

This measurement series includes 496 data points since July 3, 2026.

Lowest recorded value: 21.8 °C on August 24, 2026 · highest value: 28.5 °C on July 16, 2026.

Nearby waters

Spring Harbor Storm Sewer at Madison, Wisconsin · 6.2 km away19.3 °C Swan Creek at Lalor Road near Fitchburg, Wisconsin · 7.7 km away18.4 °C Pheasant Branch at Middleton, Wisconsin · 10.3 km away23.2 °C Badger Mill Creek at Verona, Wisconsin · 15.0 km away20.0 °C Sugar River near Verona, Wisconsin · 17.4 km away20.7 °C

Frequently asked questions

Can you swim at Lake Monona at Madison right now?
The current water temperature is 23.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Lake Monona at Madison?
Currently 23.6 °C (updated continuously).

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