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Coastwatch users:
We are experiencing technical difficulties affecting the ability of the water temperature contour maps to update. We are working to resolve the issue and apologize for any inconvenience.
Surface water temperatures, as well as other real-time and forecasted physical processes of the Great Lakes, can be accessed through NOAA's Great Lakes Coastal Forecasting System (

Lake Surface Temperature Reporting System
This reporting system is a cooperative project between the NOAA CoastWatch Great Lakes Regional Node located at the NOAA Great Lakes Environmental Research Laboratory in Ann Arbor and the Great Lakes Sea Grant Network. Created & maintained by Michigan Sea Grant and the MSU Remote Sensing & GIS Research and Outreach Services. Supported by MSU College of Agriculture and Natural Resources and MSU Extension.

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Click on a lake to view surface temperature maps.

Notice: The Great Lakes surface water temperature estimates presented in this website are automatically generated from satellite-derived sensors. Obvious errors or anomalies may be present in the resulting images as a result of satellite sensor malfunctions, adverse atmospheric conditions, or processing errors. Please notify us immediately about any errors or anomalies you observe in our products. Send your questions or concerns to

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