How cold is Lake Superior water in fall? In October water temperature throughout Lake Superior is not yet warm enough for swimming and does not exceed 68°F. Based on average water temperature observations over the past ten years, the warmest water temperature in Lake Superior in October was 55.6°F (in Sault Ste. Marie), and the coldest 50.2°F (in Silver Bay). To find out the sea temperature today and in the coming days, go to Current sea temperature in Lake Superior
Lake Superior cities and resorts with the values of the average water temperature in October in recent years.
For more detailed information about water temperature, surf forecast, weather and time of sunrise and sunset in any specific area of your interest, just click on a city name. For ease of search, all places are also grouped by the first letter of the name.
To find out what the water temperature was in Lake Superior any day over a period of the last ten years, select the month