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Lake Forest Sea Temperature in July

Illinois, United States

June Lake Forest year-round → August

Average sea temperature for Lake Forest, United States across July, based on 10 years of daily readings.

Average

20.53° C

High

24.59° C

Low

14.43° C

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

July is the 2nd warmest of 12 months at Lake Forest. On average the water sits 10.1° than the year-round mean of 10.44° C.

Compared to June, July is 5.8° warmer than (14.73° C in June). By August the water is usually 22.06° C.

Lake Forest Day-by-Day Water Temperature in July

10-year low, average and high

12.5° C
16.0° C
19.5° C
23.0° C
26.5° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through July. Range Average

Each vertical bar above is one day of July. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Lake Forest.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

July Water Temperature Table for Lake Forest

10-year daily averages

Day Average Low High
July 1 18.08° C 14.43° C 20.79° C
July 2 18.76° C 16.39° C 21.29° C
July 3 19.17° C 16.99° C 22.07° C
July 4 19.67° C 18.07° C 22.82° C
July 5 20.02° C 18.59° C 23.76° C
July 6 20.04° C 18.93° C 24.17° C
July 7 19.91° C 17.96° C 24.14° C
July 8 19.92° C 17.76° C 23.71° C
July 9 20.07° C 18.34° C 23.5° C
July 10 20° C 18.49° C 21.69° C
July 11 20.25° C 18.5° C 22.04° C
July 12 20.36° C 18.65° C 22.36° C
July 13 20.47° C 19.16° C 22.57° C
July 14 20.85° C 19.3° C 22.48° C
July 15 20.86° C 19.1° C 22.02° C
July 16 20.85° C 18.89° C 22.19° C
July 17 20.95° C 19.01° C 22.51° C
July 18 20.86° C 19.49° C 22.08° C
July 19 20.86° C 19.67° C 22.06° C
July 20 20.56° C 17.68° C 22.01° C
July 21 20.39° C 17.41° C 21.92° C
July 22 20.71° C 18.41° C 22.09° C
July 23 21.25° C 19.67° C 22.55° C
July 24 21.3° C 20.05° C 22.38° C
July 25 21.29° C 19.94° C 22.36° C
July 26 21.46° C 19.54° C 22.61° C
July 27 21.26° C 18.6° C 23.27° C
July 28 21.58° C 19.55° C 23.65° C
July 29 21.48° C 18.78° C 24.59° C
July 30 21.5° C 18.84° C 24.42° C
July 31 21.7° C 19.8° C 23.32° C

Where July Sits in the Year

July highlighted

-3.0° C
4.8° C
12.5° C
20.3° C
28.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
3.38° C
2.03° C
2.13° C
4.3° C
8.21° C
14.73° C
20.53° C
22.06° C
19.41° C
14.24° C
8.93° C
5.36° C
10-year monthly history for Lake Forest. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in July

Compare other United States water for the same month

Lake Forest Location

42.2586, -87.8406

42.25863, -87.84063 View on OpenStreetMap →

Lake Forest sits at 42.2586°N, 87.8406°W, on the coast of Illinois, United States. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Lake Forest