Lake Superior water temperature
Lake Superior, S.W. Pier, St. Marys River · Lake
The current water temperature at Lake Superior is 18.1 °C (as of September 20, 2026, source: NOAA CO-OPS).
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 1093 data points since July 22, 2026.
Lowest recorded value: 18.1 °C on September 19, 2026 · highest value: 21.2 °C on August 14, 2026.
In September, temperatures have ranged between 18.1 °C and 20.0 °C.
The current value is 1.3 °C below the September 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 18.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lake Superior?
Currently 18.1 °C (updated continuously).
How warm is at Lake Superior in September?
In September, the water temperature recently averaged 19.4 °C.
When is the water warmest at Lake Superior?
Across the measurement record, August is on average the warmest month (20.0 °C).
