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Illinois water temperature in September

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Is Illinois too cold to swim in fall? In September water temperature in some cities of Illinois is above 68°F and it is enough for comfortable bathing. Based on average water temperature observations over the past ten years, the warmest water temperature in Illinois in September was 69.3°F (in Calumet Park), and the coldest 67.6°F (in Lake Bluff). To find out the sea temperature today and in the coming days, go to Current sea temperature in Illinois

Illinois surface temperature in September

Illinois cities and resorts with the values of the average water temperature in September in recent years.
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.

 
2024
2023
2022
2021
2020
71.8°F
69.6°F
70.2°F
70.2°F
68.7°F
71.1°F
72.9°F
70.3°F
74.5°F
72°F
71.4°F
69.8°F
70.3°F
69.4°F
68.2°F
66.6°F
66.6°F
64.2°F
69.4°F
64.9°F

Illinois water temperature by month

To find out what the water temperature was in Illinois any day over a period of the last ten years, select the month

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

Where can you swim in Illinois in September?

Places with the warmest average water temperature in Illinois in September. Also indicated are the maximum and minimum temperatures in September for these locations based on observations over the past 10 years

AvrMinMax
Calumet Park69.3°F63.3°F75.2°F
Monroe Harbor69.1°F62.4°F75.2°F
Oakwood Beach69.1°F62.8°F75.6°F
Ohio Street Beach69.1°F62.4°F75.2°F
Chicago69.1°F62.4°F75.2°F

Illinois photo gallery

  • Lighthouse Beach
  • Montrose Beach pier
  • Montrose Beach pier
  • Rogers Park

If you have interesting photos of this place, you can upload them here. Photos will be available to all users after verification by the moderator.

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Our report for United States 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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