Lake Superior water temperature
Lake Superior, North Entry Buoy, North Keweenaw Peninsu · Lake
The current water temperature at Lake Superior is 11.4 °C (as of October 15, 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.
Water quality
Official EPA rating: excellentMeasurement series & statistics
This measurement series includes 1328 data points since August 17, 2026.
Lowest recorded value: 4.1 °C on September 24, 2026 · highest value: 20.3 °C on September 3, 2026.
In October, temperatures have ranged between 5.5 °C and 13.6 °C.
The current value is 0.7 °C below the October average of this series.
Nearby waters
More measuring points: Lake Superior
Frequently asked questions
Can you swim at Lake Superior right now?
The current water temperature is 11.4 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lake Superior?
Currently 11.4 °C (updated continuously).
How warm is at Lake Superior in October?
In October, the water temperature recently averaged 12.1 °C.
When is the water warmest at Lake Superior?
Across the measurement record, August is on average the warmest month (18.6 °C).
How is the water quality at Lake Superior?
The official classification is: excellent.
