World sea water temperatures

Water temperature in Lake Forest (IL) in August

Is it warm enough to swim in Lake Forest in August? Average water temperature in Lake Forest in August is 72.5°F and therefore suitable for comfortable swimming. The warmest water in Lake Forest in August is 77.2°F, and the coldest is 67.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Lake Forest

Changes water temperature in Lake Forest in August 2025, 2024

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

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
August 173.9°F75.7°F67.1°F76.5°F
August 273.4°F75.2°F67.8°F76.8°F
August 373.4°F75.7°F68.4°F77.2°F
August 473.8°F76.3°F68.9°F77.2°F
August 573.8°F76.5°F69.4°F76.8°F
August 674.7°F75.4°F70°F76.6°F
August 775.4°F75°F70°F76.8°F
August 875.9°F75°F70.2°F77°F
August 976.3°F74.7°F69.1°F76.3°F
August 1075°F73.6°F68.9°F76.1°F
August 1174.8°F73.4°F68.7°F75.7°F
August 1275.4°F73.4°F68.2°F75.7°F
August 1374.7°F73.8°F67.8°F76.3°F
August 1473.9°F74.3°F67.6°F76.5°F
August 1575°F73.9°F67.5°F76.6°F
Day 2025 2024 Min Max
August 1676.5°F74.8°F68.5°F76.8°F
August 1775.4°F74.1°F68°F76.8°F
August 1875.2°F73.9°F68.2°F76.6°F
August 1974.8°F73°F68.9°F76.6°F
August 2074.1°F72.7°F68.7°F75.7°F
August 2173°F72.7°F69.3°F75.6°F
August 2272.1°F72.5°F69.6°F74.7°F
August 2373.9°F72.5°F70.2°F75°F
August 2473.4°F73°F70.2°F75.7°F
August 2572.5°F74.1°F69.6°F75.2°F
August 2671.4°F75°F68.5°F75.2°F
August 2771.1°F75.7°F68.7°F75.7°F
August 2870.7°F74.8°F68.7°F76.5°F
August 2970.7°F75°F68.4°F75.9°F
August 3071.1°F74.8°F68.5°F76.1°F
August 3170.3°F74.8°F68.4°F74.8°F
Lake Forest water temp chart in August

Average water temperature in Lake Forest in August over a decade

20162017201820192020
73.8°F71.2°F73.4°F72.9°F74.1°F
20212022202320242025
73.4°F69.8°F72.9°F74.3°F74.5°F

Lake Forest sea state in August

Chart comparing the height of waves in Lake Forest in August 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 Lake Forest in August

Lake Forest 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 Lake Michigan in August

Where is the warm sea water in August?

Want to know where the water temperature in August 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 August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Illinois Beach State Park72.3°F65.7°F77°F
Evanston72.9°F65.3°F77.4°F
Rogers Park72.9°F65.3°F77.4°F
Winthrop Harbor72.1°F63.3°F77°F
Montrose Beach73°F64°F77.4°F
Foster Beach73°F64°F77.4°F
Simmons Island Beach71.8°F59°F76.8°F
Oak Street Beach73.2°F64.2°F77.5°F
North Avenue Beach73.2°F64.2°F77.5°F
Chicago73.2°F65.5°F77.4°F

Illinois photo gallery

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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 Lake Forest 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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