Lake Superior water temperature
Lake Superior, Slate Island · Lake
The current water temperature at Lake Superior is 9.6 °C (as of October 25, 2026, source: ECCC).
Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.
Measurement series & statistics
This measurement series includes 390 data points since September 7, 2026.
Lowest recorded value: 8.7 °C on October 18, 2026 · highest value: 16.7 °C on September 7, 2026.
In October, temperatures have ranged between 8.7 °C and 13.5 °C.
The current value is 1.2 °C below the October average of this series.
More measuring points: Lake Superior
Frequently asked questions
Can you swim at Lake Superior right now?
The current water temperature is 9.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lake Superior?
Currently 9.6 °C (updated continuously).
How warm is at Lake Superior in October?
In October, the water temperature recently averaged 10.8 °C.
