World sea water temperatures

Water temperature in Lake Forest (IL) in April

Is it warm enough to swim in Lake Forest in April? Average water temperature in Lake Forest in April is 40.8°F and therefore is not suitable for comfortable swimming. The warmest water in Lake Forest in April is 48.9°F, and the coldest is 34°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 April 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 April.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
April 140.5°F39.4°F34.9°F42.8°F
April 239.9°F39.2°F34°F43.7°F
April 341.5°F38.8°F34.2°F42.6°F
April 441°F38.7°F34.3°F42.1°F
April 540.5°F40.3°F35.2°F42.4°F
April 641.4°F40.8°F35.4°F43°F
April 742.1°F40.8°F35.4°F42.6°F
April 841.5°F41.4°F35.6°F43.7°F
April 940.8°F40.5°F35.8°F43.2°F
April 1040.5°F41.9°F36.1°F42.6°F
April 1141°F41.5°F36.7°F42.6°F
April 1242.4°F42.1°F36.9°F44.4°F
April 1341.7°F43.5°F37°F45°F
April 1442.8°F45.9°F37.2°F45.9°F
April 1543.2°F46.4°F37.4°F46.4°F
Day 2025 2024 Min Max
April 1644.2°F46.2°F37.6°F46.2°F
April 1743.5°F45.3°F37.8°F45.3°F
April 1843°F44.8°F37.8°F44.8°F
April 1942.6°F45.9°F37.4°F45.9°F
April 2045°F45.7°F37.4°F45.7°F
April 2145.5°F46°F37.6°F46°F
April 2244.6°F45.7°F37.4°F45.7°F
April 2346.2°F46.8°F37.8°F46.8°F
April 2445.5°F45°F38.5°F46.6°F
April 2545.9°F44.4°F39°F45.9°F
April 2645.9°F43.5°F39.2°F46.4°F
April 2746.9°F43°F39.4°F46.9°F
April 2848°F43.3°F39.9°F48°F
April 2947.7°F44.1°F40.3°F47.7°F
April 3048.9°F44.8°F40.6°F48.9°F
Lake Forest water temp chart in April

Average water temperature in Lake Forest in April over a decade

20162017201820192020
41.2°F40.1°F37.6°F40.6°F40.8°F
20212022202320242025
43.2°F39.6°F42.4°F43.2°F43.5°F

Lake Forest sea state in April

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

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 April

Where is the warm sea water in April?

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

AvrMinMax
Illinois Beach State Park39.4°F32.9°F46.6°F
Evanston41.7°F34.7°F48.9°F
Rogers Park41.7°F34.7°F48.9°F
Winthrop Harbor39.2°F32.7°F47.3°F
Montrose Beach42.1°F34.9°F49.6°F
Foster Beach42.1°F34.9°F49.6°F
Simmons Island Beach39°F32.7°F47.7°F
Oak Street Beach42.8°F35.1°F51.4°F
North Avenue Beach42.8°F35.1°F51.4°F
Chicago42.4°F34.9°F50.4°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 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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