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Water temperature in Foster Beach (IL) in September

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Is it warm enough to swim in Foster Beach in September? Average water temperature in Foster Beach in September is 68.7°F and therefore suitable for comfortable swimming. The warmest water in Foster Beach in September is 75°F, and the coldest is 61.7°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 September 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 September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 169.8°F74.5°F64.2°F75°F
September 269.6°F73.6°F66.2°F74.3°F
September 369.4°F73.4°F66.4°F73.6°F
September 468.9°F73.4°F64.4°F74.5°F
September 568.2°F73.6°F63.5°F74.1°F
September 666.7°F73.2°F62.8°F74.3°F
September 766°F72.1°F64.6°F73.9°F
September 866°F70.7°F64.4°F72.7°F
September 966°F70.3°F64.6°F72°F
September 1066.2°F70.3°F65.3°F72.9°F
September 1166.6°F70.5°F66.2°F72.5°F
September 1266.7°F71.2°F66.2°F71.8°F
September 1366.2°F71.4°F65.5°F71.4°F
September 1466.7°F71.4°F64.9°F71.4°F
September 1566.9°F71.8°F64.8°F71.8°F
Day 2025 2024 Min Max
September 1667.3°F72.1°F62.2°F72.1°F
September 1767.1°F72.1°F62.8°F72.1°F
September 1867.3°F72°F63.3°F72°F
September 1966.9°F72.3°F63.3°F72.3°F
September 2066.4°F72°F63.3°F72°F
September 2165.3°F72.5°F62.8°F72.5°F
September 2264.4°F72.1°F61.7°F72.1°F
September 2364°F70.3°F61.9°F71.1°F
September 2462.1°F70°F62.1°F71.2°F
September 2561.2°F69.8°F61.2°F71.1°F
September 2660.8°F69.6°F60.8°F70.9°F
September 2760.8°F69.1°F60.8°F70.2°F
September 2860.6°F68.5°F60.6°F70°F
September 2961.3°F68.7°F61.3°F68.9°F
September 3061.3°F69.1°F61.3°F69.1°F
Foster Beach water temp chart in September

Average water temperature in Foster Beach in September over a decade

20162017201820192020
70°F68.9°F69.8°F65.3°F67.8°F
20212022202320242025
69.1°F69.8°F69.4°F71.4°F

Foster Beach water temperature during other months:

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

Where is the warm sea water in September?

Want to know where the water temperature in September is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

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

AvrMinMax
Whiting69.1°F63.3°F75.4°F
Calumet Park69.3°F63.3°F75.2°F
Hammond69.3°F63.3°F75.2°F
Waukegan68°F55°F74.8°F
Gary69.3°F63.5°F75°F
Ogden Dunes69.3°F63.5°F74.8°F
Lake Bluff67.6°F55.9°F73.9°F
Burns Harbor69.3°F63.3°F74.8°F
West Beach69.3°F63.7°F74.8°F
Portage69.3°F63.7°F74.8°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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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.

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