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Carlyle Lake — Current Water Temperature, Annual Trends and Forecast

This page provides information on the current water temperature in Carlyle Lake, trends, monthly ranges and the forecast for the coming days.

Carlyle Lake, United States
Carlyle Lake, United States © By U.S. Army Corps of Engineers, Public domain

Current Water Temperature

26.2°C
Today
25.8°C
Yesterday
26.1°C
A Week Ago
Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

Water Temperature in Carlyle Lake today is 26.2°C.

Water Temperature: Daily Trends, Historical Records, and Forecast

✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.

Water Temperature Chart Over the Last 30 Days

From May 30 to June 30

Table of Daily Sea Temperature Data

Date Current Average Forecast
JUN 2326.1°C23.1°C
JUN 2426.0°C23.1°C
JUN 2526.0°C23.1°C
JUN 2626.0°C23.1°C
JUN 2724.9°C23.1°C
JUN 2825.5°C23.1°C
JUN 2925.8°C23.1°C
JUN 3026.2°C23.1°C
JUL 127.5°C26.3°C
JUL 227.5°C26.3°C
JUL 327.5°C26.4°C
JUL 427.5°C26.5°C
JUL 527.5°C26.5°C
JUL 627.5°C26.6°C
JUL 727.5°C26.7°C

* Current - Actual water temperature value

** Average - Average water temperature on this day in recent years

*** Forecast - Our water temperature forecast

Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.

Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.

Monthly Water Temperature Range (Min, Max & Average)

Month Min Avg Max
January1°C3°C6°C
February1°C4°C6°C
March2°C8°C14°C
April6°C13°C20°C
May14°C18°C22°C
June20°C23°C27°C
July24°C28°C31°C
August22°C24°C27°C
September22°C25°C27°C
October14°C19°C24°C
November7°C11°C14°C
December2°C5°C7°C

Carlyle Lake: Water Temperature by Location

Carlyle Lake: Weather Forecast

July 1

° / °
slight thunderstorm
rain: 1% | wind:

July 2

° / °
slight thunderstorm
rain: 6% | wind:

July 3

° / °
thunderstorm with slight and heavy hail
rain: 17% | wind:

July 4

° / °
thunderstorm with slight and heavy hail
rain: 18% | wind:

July 5

° / °
slight thunderstorm
rain: 24% | wind:

July 6

° / °
moderate thunderstorm
rain: 25% | wind:

Location & Local Information

Carlyle Lake’s water temperature changes a lot through the year because it’s a large Midwestern reservoir with varying depths and broad shallows. In spring the surface often runs about 45–60°F (7–16°C) as runoff and cool air dominate. By summer surface temperatures commonly reach the low to upper 70s°F, roughly 70–80°F (21–27°C), and in shallow coves can briefly climb into the low 80s°F (27–28°C) on hot, calm days. Autumn brings a steady cooling, with surface readings typically falling to about 50–65°F (10–18°C). In winter the lake is cold, frequently near freezing at 32–40°F (0–4°C) and portions can ice over during prolonged cold snaps. Deeper water remains colder year-round, and local conditions such as wind, recent precipitation, and boat traffic cause short-term fluctuations.

Swimming is permitted but treated with caution: there are designated swimming beaches and recreation areas managed by the lake authorities, yet many shoreline stretches are not staffed or supervised. Authorities generally allow bathing in specified zones but discourage open-water swimming in busy boating areas because of wake, submerged hazards, and variable water quality. Lifeguards are not always present, so swimmers should follow posted rules, be mindful of seasonal cold-water risks (hypothermia in spring and fall), and choose marked swim areas for safer conditions.

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Frequently Asked Questions

What is the current water temperature in Carlyle Lake?
Water Temperature in Carlyle Lake today is 26.2°C.
What is the water temperature in Carlyle Lake during the summer months?
The water temperature in Carlyle Lake in summer fluctuates in the range of 20°C - 31°C.
Is it possible to swim in Carlyle Lake and what are the possibilities for this?
Yes, swimming is allowed in Carlyle Lake, Illinois. There are officially designated swimming areas, such as the beach in Eldon Hazlet, providing safe opportunities for visitors.