Lake Marie — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Marie, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Marie today is 19.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| SEP 14 | 20.9°C | 21.4°C | |
| SEP 15 | 21.5°C | 21.4°C | |
| SEP 16 | 19.1°C | 21.4°C | |
| SEP 17 | 19.4°C | 21.4°C | |
| SEP 18 | 20.2°C | 21.4°C | |
| SEP 19 | 19.6°C | 21.4°C | |
| SEP 20 | 19.0°C | 21.4°C | |
| SEP 22 | 21.4°C | 19.2°C | |
| SEP 23 | 21.4°C | 19.3°C | |
| SEP 24 | 21.4°C | 19.4°C | |
| SEP 25 | 21.4°C | 19.6°C | |
| SEP 26 | 21.4°C | 19.7°C | |
| SEP 27 | 21.4°C | 19.8°C | |
| SEP 28 | 21.4°C | 19.9°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 |
|---|---|---|---|
| January | 0°C | 4°C | 8°C |
| February | 1°C | 4°C | 7°C |
| March | 2°C | 5°C | 8°C |
| April | 5°C | 9°C | 13°C |
| May | 10°C | 14°C | 19°C |
| June | 16°C | 19°C | 23°C |
| July | 20°C | 25°C | 30°C |
| August | 24°C | 26°C | 29°C |
| September | 18°C | 21°C | 25°C |
| October | 13°C | 17°C | 20°C |
| November | 2°C | 9°C | 15°C |
| December | 4°C | 3°C | 9°C |
Lake Marie: Water Temperature by Location
Lake Marie: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Lake Marie, like many small inland lakes in Illinois, shows marked seasonal variation in water temperature. In winter the surface often approaches freezing near 32°F (0°C) and can develop ice cover. Spring temperatures typically rise through the 40–60°F (4–15°C) range as runoff and warming air temperatures influence the water. Summer brings the warmest conditions, with surface readings commonly between about 70–80°F (21–27°C) and occasionally reaching the mid‑80s (around 29°C) during heat waves. In autumn the surface cools back through roughly 50–65°F (10–18°C). Deeper areas may remain several degrees colder than the surface because of thermal stratification, so temperature can vary by depth and location within the lake.
Swimming at Lake Marie is usually most practical in late spring through early fall when surface temperatures are comfortable. Whether swimming is formally allowed depends on local management and posted rules: some lakes provide designated beach areas and supervision, while others discourage or prohibit swimming for safety reasons. Common reasons for restrictions include water‑quality advisories (such as algal blooms or bacterial concerns), submerged hazards, boat traffic, and the absence of lifeguards. Cold water below roughly 60°F (15°C) can also pose risks like cold‑water shock, so visitors should follow signs and local advisories before entering the water.