Lake Bloomington — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Bloomington, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Bloomington today is 17.3°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 | 19.8°C | 17.5°C | |
| OCT 6 | 19.9°C | 17.5°C | |
| OCT 7 | 18.6°C | 17.5°C | |
| OCT 8 | 18.3°C | 17.5°C | |
| OCT 9 | 18.6°C | 17.5°C | |
| OCT 10 | 18.6°C | 17.5°C | |
| OCT 11 | 17.8°C | 17.5°C | |
| OCT 12 | 18.0°C | 17.5°C | |
| OCT 13 | 17.5°C | 17.3°C | |
| OCT 14 | 17.5°C | 17.3°C | |
| OCT 15 | 17.5°C | 17.3°C | |
| OCT 16 | 17.5°C | 17.3°C | |
| OCT 17 | 17.5°C | 17.4°C | |
| OCT 18 | 17.5°C | 17.4°C | |
| OCT 19 | 17.5°C | 17.4°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 | 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 | 18°C | 22°C | 26°C |
| July | 23°C | 27°C | 30°C |
| August | 22°C | 26°C | 30°C |
| September | 20°C | 24°C | 27°C |
| October | 13°C | 18°C | 22°C |
| November | 4°C | 9°C | 13°C |
| December | 0°C | 3°C | 6°C |
Lake Bloomington: Water Temperature by Location
Lake Bloomington: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Lake Bloomington, a reservoir that serves as a municipal water source near Bloomington, Illinois, experiences typical Midwestern seasonal temperature swings. In winter the lake surface commonly hovers around freezing, roughly 32–40°F (0–4°C). As spring warms, surface waters usually rise into the 40–60°F range (4–16°C). Summer brings the warmest conditions, with surface temperatures often between about 68–82°F (20–28°C) on sunny days, while deeper areas remain cooler. During autumn the lake cools back down, typically settling in the 45–65°F band (7–18°C) before ice forms. Local conditions, wind, and depth can shift these numbers by a few degrees, and short-term weather patterns can produce larger day-to-day variation.
Swimming at Lake Bloomington is generally not permitted because the reservoir is managed primarily as a drinking water supply and public swimming is restricted to protect water quality and reduce contamination risks. Safety concerns also factor into that decision, since there are limited lifeguarded beaches and variable underwater conditions. Recreational use of the lake commonly centers on boating and fishing from designated access points, while those seeking open-water swimming typically use lakes or pools specifically designated and staffed for that purpose.