Water temperature in Foster Beach (IL) in August

Is it warm enough to swim in Foster Beach in August? Average water temperature in Foster Beach in August is 73°F and therefore suitable for comfortable swimming. The warmest water in Foster Beach in August is 77.4°F, and the coldest is 64°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Foster Beach

Changes water temperature in Foster Beach in August 2025, 2024

To get an accurate forecast for the water temperature in Foster Beach for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Foster Beach, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of August.

Average water temperature in Foster Beach in August over a decade

You can also view information about water temperature for other months by clicking on the month button below

The nearest locations with the average water temperature in August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

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Our report for Foster Beach is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.