Lake Michigan water temperature
Lake Michigan, Winthrop Harbor Buoy, IL · Lake
The current water temperature at Lake Michigan is 12.0 °C (as of October 16, 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: goodMeasurement series & statistics
This measurement series includes 1089 data points since August 30, 2026.
Lowest recorded value: 8.2 °C on August 30, 2026 · highest value: 23.4 °C on September 4, 2026.
In October, temperatures have ranged between 9.5 °C and 17.9 °C.
The current value is 3.8 °C below the October 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 12.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lake Michigan?
Currently 12.0 °C (updated continuously).
How warm is at Lake Michigan in October?
In October, the water temperature recently averaged 15.8 °C.
When is the water warmest at Lake Michigan?
Across the measurement record, September is on average the warmest month (18.3 °C).
How is the water quality at Lake Michigan?
The official classification is: good.
