Lake Lemon — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Lemon, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Lemon today is 18.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 | 20.8°C | 21.0°C | |
| OCT 6 | 20.3°C | 21.0°C | |
| OCT 7 | 20.0°C | 21.0°C | |
| OCT 8 | 19.4°C | 21.0°C | |
| OCT 9 | 19.6°C | 21.0°C | |
| OCT 10 | 18.9°C | 21.0°C | |
| OCT 11 | 19.2°C | 21.0°C | |
| OCT 12 | 18.5°C | 21.0°C | |
| OCT 13 | 21.0°C | 18.5°C | |
| OCT 14 | 21.0°C | 18.7°C | |
| OCT 15 | 21.0°C | 18.8°C | |
| OCT 16 | 21.0°C | 18.9°C | |
| OCT 17 | 21.0°C | 19.1°C | |
| OCT 18 | 21.0°C | 19.2°C | |
| OCT 19 | 21.0°C | 19.3°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 | 9°C |
| February | 2°C | 5°C | 7°C |
| March | 4°C | 8°C | 12°C |
| April | 7°C | 12°C | 18°C |
| May | 14°C | 18°C | 22°C |
| June | 18°C | 22°C | 25°C |
| July | 21°C | 27°C | 32°C |
| August | 25°C | 28°C | 30°C |
| September | 21°C | 25°C | 29°C |
| October | 17°C | 21°C | 25°C |
| November | 8°C | 13°C | 17°C |
| December | 4°C | 7°C | 10°C |
Lake Lemon: Water Temperature by Location
Lake Lemon: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Lake Lemon, a reservoir near Bloomington, Indiana, shows typical Midwestern seasonal temperature patterns. Surface water in winter often approaches freezing, roughly 32–40°F (0–4°C), and the lake can ice over some winters. In spring it warms into the 40–60°F (4–16°C) range as stratification begins. Summer surface temperatures commonly reach about 70–80°F (21–27°C), and during hot spells can climb toward 80–85°F (27–29°C) in the warmest weeks; deeper water remains noticeably cooler. By autumn the surface usually cools back to roughly 50–65°F (10–18°C) before turnover sets in. These ranges vary year to year with air temperature, wind, depth and inflow.
Swimming at Lake Lemon is generally allowed but is concentrated in managed, designated beach or park areas rather than throughout the entire reservoir. County parks or marinas typically open seasonal swim areas and sometimes provide lifeguards; however, authorities may close swimming periodically for safety or public-health reasons such as high bacteria counts, harmful algal blooms, poor weather or water-quality concerns. Boating and fishing areas are separate from supervised swim zones, and swimmers should follow posted rules and local advisories because conditions and access change with seasons and environmental factors.