Lake Superior water temperature

Lake Superior, Wisconsin Point · Lake

The current water temperature at Lake Superior is 19.1 °C (as of August 31, 2026, source: NOAA NDBC).

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

19.1 °C

Measured: August 31, 2026 · continuously updated

💧 Water 19.1° · ☀️ Air 27.2°

Temperature trend of recent weeks

Lake Superior — Photo: Sharon Mollerus · CC BY 2.0 · Wikimedia Commons

Water quality

Official EPA rating: excellent

Measurement series & statistics

This measurement series includes 1309 data points since July 3, 2026.

Lowest recorded value: 7.6 °C on July 25, 2026 · highest value: 23.2 °C on July 12, 2026.

Nearby waters

Lake Superior, Duluth · 10.2 km away17.8 °C Lake Superior, Western Lake Superior · 14.8 km away17.1 °C Lake Superior, Duluth-Offshore Buoy(LLO2) · 17.5 km away18.8 °C Lake Superior, McQuade Harbor Nearshore, MN · 18.4 km away16.8 °C St. Louis River at Scanlon, Minnesota · 31.2 km away22.6 °C

More measuring points: Lake Superior

Ontonagon, MI19.9 °C S.W. Pier, St. Marys River19.3 °C North Entry Buoy, North Keweenaw Peninsu19.0 °C Duluth-Offshore Buoy(LLO2)18.8 °C North Entry Buoy, North Keweenaw Peninsula18.6 °C South Entry Buoy, South Keweenaw Peninsu18.4 °C

Frequently asked questions

Can you swim at Lake Superior right now?
The current water temperature is 19.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Lake Superior?
Currently 19.1 °C (updated continuously).

How is the water quality at Lake Superior?
The official classification is: excellent.

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