Lake Michigan water temperature
Lake Michigan, Ohio Street Beach · Lake
The current water temperature at Lake Michigan is 22.4 °C (as of September 20, 2026, source: Chicago Park District).
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: poorMeasurement series & statistics
This measurement series includes 1363 data points since July 22, 2026.
Lowest recorded value: 19.4 °C on September 4, 2026 · highest value: 33.3 °C on September 12, 2026.
In September, temperatures have ranged between 19.4 °C and 33.3 °C.
The current value is 0.5 °C below the September average of this series.
Nearby waters
More measuring points: Lake Michigan
Frequently asked questions
Can you swim at Lake Michigan right now?
The current water temperature is 22.4 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lake Michigan?
Currently 22.4 °C (updated continuously).
How warm is at Lake Michigan in September?
In September, the water temperature recently averaged 22.9 °C.
When is the water warmest at Lake Michigan?
Across the measurement record, July is on average the warmest month (23.3 °C).
How is the water quality at Lake Michigan?
The official classification is: poor.
