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Notice regarding image quality

Coastwatch users:
Due to technical issues, this site is no longer able to produce updated surface water temperature contour maps. Please check back in July for more information about future resources.
Daily maps of observed surface temperatures can be found at these NOAA links:
Lake Superior:
Lake Michigan & Lake Huron:
Lake Erie:
Lake Ontario:

Lake Superior
[Full Lake View]

Lake Superior Regions
[Western Region] [Central Region] [Eastern Region]

Lake Superior Port Images
[Superior/Duluth] [Beaver Bay] [Grand Marais, Minnesota] [Ontonagon] [Washburn] [Isle Royale]
[Keweenaw Peninsula] [Keweenaw Bay] [Marquette] [Grand Marais, Michigan] [Whitefish Bay]

Regional and Port Image Map

Select a label to view region or port map.

Whitefish Bay Port Area Grand Marais Michigan Port Area Marquette Port Area Keweenaw Bay Port Area Keweenaw Peninsula Port Area Washburn Port Area Ontonagon Port Area Superior/Duluth Port Area Beaver Bay Port Area Grand Marais Minnesota Port Area Isle Royale Port Area Eastern Lake Superior Central Lake Superior Western Lake Superior
Most questions can be answered by your Sea Grant Agent or on our CoastWatch Help Pages. Please send comments or bug reports to Please include the name of the location or file that's giving you trouble, as well as the type of software you are running. This 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 Sea Grant Network.
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