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Water temperature in Winthrop Harbor (IL) in September

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Is it warm enough to swim in Winthrop Harbor in September? Average water temperature in Winthrop Harbor in September is 67.8°F and therefore is not suitable for comfortable swimming. The warmest water in Winthrop Harbor in September is 73.6°F, and the coldest is 61°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Winthrop Harbor

Changes water temperature in Winthrop Harbor in September 2025, 2024

To get an accurate forecast for the water temperature in Winthrop Harbor for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Winthrop Harbor, 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 171.4°F73.6°F65.1°F73.6°F
September 271.2°F73.2°F65.7°F73.2°F
September 371.1°F73°F64.4°F73°F
September 469.8°F73.2°F63.3°F73.2°F
September 5 73.4°F63.1°F73.4°F
September 6 72.9°F63.1°F73.4°F
September 7 71.8°F65.1°F72.9°F
September 8 70.5°F64.6°F72.1°F
September 9 70.2°F63.7°F71.4°F
September 10 70.7°F63.7°F72.5°F
September 11 70.5°F65.7°F72.3°F
September 12 71.1°F65.8°F71.2°F
September 13 70.9°F64.4°F70.9°F
September 14 71.8°F64.4°F71.8°F
September 15 72.3°F63°F72.3°F
Day 2025 2024 Min Max
September 16 72.7°F62.8°F72.7°F
September 17 72.7°F63.1°F72.7°F
September 18 72.5°F63.3°F72.5°F
September 19 72.9°F63.3°F72.9°F
September 20 73.2°F63.1°F73.2°F
September 21 73.2°F62.2°F73.2°F
September 22 72.7°F61.7°F72.7°F
September 23 70.9°F61.9°F70.9°F
September 24 70.2°F61.5°F71.2°F
September 25 70.3°F61.7°F71.2°F
September 26 70.3°F62.1°F70.9°F
September 27 69.8°F62.2°F70.2°F
September 28 69.4°F61.5°F70°F
September 29 69.3°F61°F69.3°F
September 30 69.8°F61.7°F69.8°F
Winthrop Harbor water temp chart in September

Average water temperature in Winthrop Harbor in September over a decade

20152016201720182019
66°F68.9°F68.5°F67.3°F64.8°F
20202021202220232024
66.6°F68.4°F68.2°F68.5°F71.6°F

Winthrop Harbor sea state in September

Chart comparing the height of waves in Winthrop Harbor in September over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Winthrop Harbor in September

Winthrop Harbor water temperature during other months:

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

Water temperature at Lake Michigan in September

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
Illinois Beach State Park68°F59.7°F74.1°F
Simmons Island Beach67.6°F61.3°F73.4°F
Tower Road Beach68°F53.2°F74.7°F
Glencoe68°F53.2°F74.7°F
Oak Creek66.4°F57.9°F73.6°F
Winnetka68.2°F55.9°F75°F
Wilmette68.4°F56.8°F75°F
Evanston68.7°F60.6°F75.4°F
Rogers Park68.7°F60.6°F75.4°F
Montrose Beach68.7°F61.7°F75°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 Winthrop Harbor 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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