World sea water temperatures

Water temperature in Winnetka (IL) in September

Is it warm enough to swim in Winnetka in September? Average water temperature in Winnetka in September is 68.2°F and therefore suitable for comfortable swimming. The warmest water in Winnetka in September is 75°F, and the coldest is 55.9°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Winnetka

Changes water temperature in Winnetka in September 2025, 2024

To get an accurate forecast for the water temperature in Winnetka for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Winnetka, 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 170.9°F75°F64.8°F75°F
September 271.2°F74.3°F66°F74.3°F
September 371.8°F73.9°F64.8°F73.9°F
September 472°F73.4°F63°F74.3°F
September 5 73.6°F63.7°F73.9°F
September 6 73.2°F61.7°F74.3°F
September 7 72.5°F63.7°F73.9°F
September 8 70.7°F64.2°F72.7°F
September 9 70.2°F64°F71.4°F
September 10 69.8°F64.8°F72.7°F
September 11 70.3°F65.8°F72.3°F
September 12 70.7°F66.4°F71.6°F
September 13 71.4°F64.9°F71.4°F
September 14 71.4°F64.2°F71.4°F
September 15 71.8°F64.2°F71.8°F
Day 2025 2024 Min Max
September 16 72.3°F62.2°F72.3°F
September 17 72.3°F62.6°F72.3°F
September 18 72.3°F62.8°F72.3°F
September 19 72.5°F62.8°F72.5°F
September 20 72.1°F62.8°F72.1°F
September 21 72.5°F62.2°F72.5°F
September 22 72°F61.2°F72°F
September 23 70.2°F61.3°F70.9°F
September 24 69.8°F61.5°F71.1°F
September 25 69.6°F61.5°F70.9°F
September 26 69.4°F61°F70.9°F
September 27 69.3°F59.9°F70.2°F
September 28 68.9°F57.9°F69.8°F
September 29 68.9°F55.9°F69.1°F
September 30 68.4°F57.2°F68.4°F
Winnetka water temp chart in September

Average water temperature in Winnetka in September over a decade

20152016201720182019
66.9°F69.4°F68.7°F69.1°F63.5°F
20202021202220232024
66.7°F68.9°F69.3°F69.3°F71.4°F

Winnetka sea state in September

Chart comparing the height of waves in Winnetka 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 Winnetka in September

Winnetka water temperature during other months:

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

Michigan Lake water temperature 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
Glencoe68°F53.2°F74.7°F
Rogers Park68.7°F60.6°F75.4°F
Highland Park67.8°F50.5°F74.3°F
Montrose Beach68.7°F61.7°F75°F
Foster Beach68.7°F61.7°F75°F
Lake Forest67.8°F49.8°F74.3°F
Oak Street Beach68.9°F62.4°F75.2°F
North Avenue Beach68.9°F62.4°F75.2°F
Chicago69.1°F62.4°F75.2°F
Ohio Street Beach69.1°F62.4°F75.2°F

Illinois photo gallery

  • Dead River Closed Mouth Sand Band
  • Montrose Beach pier
  • Montrose Beach pier
  • Montrose Beach pier

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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 Winnetka 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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