Lake Shelbyville — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Shelbyville, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Shelbyville today is 28.2°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 | 26.7°C | 27.0°C | |
| AUG 5 | 26.7°C | 27.0°C | |
| AUG 6 | 27.8°C | 27.0°C | |
| AUG 7 | 27.8°C | 27.0°C | |
| AUG 8 | 27.8°C | 27.0°C | |
| AUG 9 | 28.2°C | 27.0°C | |
| AUG 10 | 28.2°C | 27.0°C | |
| AUG 11 | 28.4°C | 27.0°C | |
| AUG 12 | 27.0°C | 28.1°C | |
| AUG 13 | 27.0°C | 28.1°C | |
| AUG 14 | 27.0°C | 28.0°C | |
| AUG 15 | 27.0°C | 28.0°C | |
| AUG 16 | 27.0°C | 27.9°C | |
| AUG 17 | 27.0°C | 27.8°C | |
| AUG 18 | 27.0°C | 27.8°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 | 3°C | 6°C |
| February | 0°C | 3°C | 6°C |
| March | 2°C | 7°C | 12°C |
| April | 6°C | 12°C | 19°C |
| May | 14°C | 18°C | 22°C |
| June | 19°C | 22°C | 26°C |
| July | 20°C | 25°C | 30°C |
| August | 24°C | 27°C | 30°C |
| September | 21°C | 25°C | 29°C |
| October | 14°C | 18°C | 21°C |
| November | 6°C | 11°C | 15°C |
| December | 0°C | 3°C | 7°C |
Lake Shelbyville: Water Temperature by Location
Lake Shelbyville: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Lake Shelbyville, a reservoir in central Illinois, experiences wide seasonal variation in surface water temperature. In spring the lake typically ranges from about 40–65°F (4–18°C) as it warms after winter. Peak summer surface temperatures commonly reach roughly 70–85°F (21–29°C), making the water most comfortable for prolonged swimming. In fall the surface cools back toward roughly 45–70°F (7–21°C) and by winter temperatures at the surface can approach freezing, on the order of 32–40°F (0–4°C), with ice possible in colder spells. Deeper water remains noticeably cooler year-round, and stratification in warm months can produce sharp temperature differences with depth.
Swimming is allowed at Lake Shelbyville, particularly in designated beaches and swim areas maintained for recreation, because the reservoir is managed for multiple public uses including bathing. However, access and safety depend on seasonal conditions and local advisories: lifeguards are not always present, water quality monitoring can prompt temporary closures for high bacteria or blue‑green algae, and cold or rapidly changing temperatures raise the risk of cold‑water shock. Visitors are advised to follow posted signs, check current advisories, and take standard precautions such as swimming with companions and avoiding deep or boat traffic areas.