Water temperature throughout Illinois warms above 68°F and it is enough for a comfortable bath. The warmest water temperature in Illinois today is 72°F (Winnetka), and the coldest temperature is 68.9°F (Montrose Beach).
Below are the cities and resorts in Illinois with the values of water temperature today and yesterday. Also indicated are the maximum and minimum water temperatures that were recorded this month for the last ten years. Presented weather data are now available for each of the resorts. 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.
Today, the highest waves along the entire coast of Illinois are expected at Lake Forest, reaching a height of 3' 5" (1.04 m). The calmest seas can be found at South Shore Beach, with an average wave height of 1' 5" (0.42 m). If you want to see the 10-day sea forecast, choose the city you are interested in.
To find out what the water temperature was in Illinois any day over a period of the last ten years, select the month.