Evergreen Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Evergreen Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Evergreen Lake today is 17°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 |
|---|---|---|---|
| OCT 5 | 19.0°C | 17.0°C | |
| OCT 6 | 18.5°C | 17.0°C | |
| OCT 7 | 18.2°C | 17.0°C | |
| OCT 8 | 17.9°C | 17.0°C | |
| OCT 9 | 18.2°C | 17.0°C | |
| OCT 10 | 18.3°C | 17.0°C | |
| OCT 11 | 17.5°C | 17.0°C | |
| OCT 12 | 17.7°C | 17.0°C | |
| OCT 13 | 17.0°C | 17.0°C | |
| OCT 14 | 17.0°C | 17.0°C | |
| OCT 15 | 17.0°C | 17.0°C | |
| OCT 16 | 17.0°C | 17.0°C | |
| OCT 17 | 17.0°C | 17.0°C | |
| OCT 18 | 17.0°C | 17.0°C | |
| OCT 19 | 17.0°C | 17.0°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 | 3°C | 6°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 6°C | 12°C |
| April | 6°C | 12°C | 18°C |
| May | 13°C | 18°C | 23°C |
| June | 19°C | 23°C | 26°C |
| July | 22°C | 26°C | 30°C |
| August | 22°C | 26°C | 30°C |
| September | 20°C | 24°C | 27°C |
| October | 12°C | 17°C | 22°C |
| November | 4°C | 8°C | 12°C |
| December | 0°C | 3°C | 6°C |
Evergreen Lake: Water Temperature by Location
Evergreen Lake: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Evergreen Lake in Illinois experiences the same seasonal swing in water temperature typical of Midwestern reservoirs. Surface temperatures in winter commonly hover just above freezing, roughly 33–38°F (1–3°C) when ice is absent. In spring the lake warms through the range of about 40–60°F (4–16°C) as air temperatures rise and stratification begins. Peak summer surface temperatures frequently reach about 70–80°F (21–27°C) on warm afternoons, though shallower bays can be warmer and deeper water cooler. By early fall the surface cools back toward roughly 60–70°F (16–21°C). Local factors such as depth, inflows, wind, and recent weather events can shift these numbers by several degrees, and deeper layers remain considerably colder year-round.
Swimming opportunities at Evergreen Lake tend to be limited and informal rather than supported by staffed beaches. Many visitors swim from shore in warm months, but there may not be monitored or designated swim areas, and rules can vary by property or managing agency. Reasons for limited formal swimming include safety concerns (no lifeguards, boat traffic, drop-offs), occasional water-quality issues such as algal blooms or runoff, and resource-management priorities like fishing and boating. If you plan to swim, check posted notices or contact local authorities for current advisories and recommended locations.