Argyle Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Argyle Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Argyle Lake today is 22.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 | 23.2°C | 23.9°C | |
| SEP 15 | 22.9°C | 23.9°C | |
| SEP 16 | 22.6°C | 23.9°C | |
| SEP 17 | 22.9°C | 23.9°C | |
| SEP 18 | 22.6°C | 23.9°C | |
| SEP 19 | 22.4°C | 23.9°C | |
| SEP 20 | 22.9°C | 23.9°C | |
| SEP 22 | 23.9°C | 22.6°C | |
| SEP 23 | 23.9°C | 22.6°C | |
| SEP 24 | 23.9°C | 22.7°C | |
| SEP 25 | 23.9°C | 22.8°C | |
| SEP 26 | 23.9°C | 22.9°C | |
| SEP 27 | 23.9°C | 22.9°C | |
| SEP 28 | 23.9°C | 23.0°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 | 1°C | 4°C | 6°C |
| February | 0°C | 3°C | 6°C |
| March | 0°C | 5°C | 10°C |
| April | 6°C | 12°C | 19°C |
| May | 14°C | 19°C | 24°C |
| June | 19°C | 24°C | 29°C |
| July | 23°C | 27°C | 31°C |
| August | 23°C | 26°C | 30°C |
| September | 21°C | 24°C | 27°C |
| October | 16°C | 19°C | 22°C |
| November | 6°C | 13°C | 18°C |
| December | 2°C | 5°C | 8°C |
Argyle Lake: Water Temperature by Location
Argyle Lake: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Argyle Lake in western Illinois experiences the full range of Midwest seasonal water temperatures. In winter the surface often approaches freezing, roughly 32–40°F (0–4°C) under ice or near-ice conditions. Spring warming typically moves the lake through about 40–65°F (4–18°C) as snowmelt and runoff mix with rising air temperatures. Peak summer surface temperatures commonly reach the mid‑60s to upper‑70s °F, roughly 65–80°F (18–27°C), with the warmest, shallow areas sometimes edging a bit higher on hot, calm days. Into early fall the lake cools again, generally settling between about 50–70°F (10–21°C) before colder weather returns.
Swimming is not a primary activity at Argyle Lake because the park does not maintain a designated, lifeguarded swim beach and the lake is managed mainly for fishing, boating and wildlife habitat. That lack of a marked swim area, combined with shoreline drop‑offs, submerged vegetation and variable temperatures, means formal swimming is discouraged; many visitors instead use canoes or kayaks, fish from the shore or boat, or wade cautiously in warm weather. Anyone choosing to enter the water should be aware of cold pockets, underwater hazards and the absence of on‑site life saving services.