Saganashkee Slough Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Saganashkee Slough Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Saganashkee Slough Lake today is 28.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating. 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 |
|---|---|---|---|
| AUG 4 | 26.4°C | 25.6°C | |
| AUG 5 | 27.1°C | 25.6°C | |
| AUG 6 | 28.0°C | 25.6°C | |
| AUG 7 | 28.1°C | 25.6°C | |
| AUG 8 | 28.1°C | 25.6°C | |
| AUG 9 | 28.2°C | 25.6°C | |
| AUG 10 | 28.5°C | 25.6°C | |
| AUG 11 | 28.5°C | 25.6°C | |
| AUG 12 | 25.6°C | 28.4°C | |
| AUG 13 | 25.6°C | 28.2°C | |
| AUG 14 | 25.6°C | 28.1°C | |
| AUG 15 | 25.6°C | 27.9°C | |
| AUG 16 | 25.6°C | 27.8°C | |
| AUG 17 | 25.6°C | 27.6°C | |
| AUG 18 | 25.6°C | 27.5°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 | 5°C |
| February | 1°C | 6°C | 10°C |
| March | 3°C | 9°C | 15°C |
| April | 8°C | 14°C | 20°C |
| May | 11°C | 18°C | 24°C |
| June | 17°C | 22°C | 26°C |
| July | 23°C | 27°C | 31°C |
| August | 23°C | 26°C | 29°C |
| September | 19°C | 24°C | 28°C |
| October | 10°C | 16°C | 22°C |
| November | 4°C | 7°C | 10°C |
| December | 0°C | 2°C | 5°C |
Saganashkee Slough Lake: Water Temperature by Location
Saganashkee Slough Lake: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Saganashkee Slough is a shallow, man-made impoundment in Cook County whose surface water temperatures follow the typical seasonal pattern for Midwestern lakes. In spring (March–May) temperatures commonly rise from roughly 40–65°F (4–18°C) as air warms and ice melts. By summer (June–August) the shallower bays and protected coves often reach around 70–80°F (21–27°C), occasionally a bit warmer on hot, calm stretches. In early fall (September–November) surface temperatures fall back to the 50–65°F (10–18°C) range as cooler nights set in. In winter the slough usually approaches freezing, about 32–40°F (0–4°C), and can freeze over depending on sustained cold, with localized variation from depth, wind and inflows affecting these numbers.
Swimming is generally not permitted at Saganashkee Slough because the site lacks a designated, lifeguarded beach and the Forest Preserve’s rules restrict swimming except at approved locations. Besides regulatory limits, the slough’s combination of boating activity, submerged hazards, variable depths and occasional water-quality concerns make it unsuitable for casual bathing even when temperatures are warm. Recreational use is focused on fishing, boating and wildlife viewing, so anyone considering entering the water should check local preserve rules and posted signage and treat the slough as a non‑swimming water body.