Monroe Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Monroe Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Monroe Lake today is 22.9°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 13 | 24.5°C | 26.0°C | |
| SEP 14 | 24.5°C | 26.0°C | |
| SEP 15 | 23.9°C | 26.0°C | |
| SEP 16 | 23.4°C | 26.0°C | |
| SEP 17 | 22.9°C | 26.0°C | |
| SEP 18 | 22.8°C | 26.0°C | |
| SEP 19 | 23.3°C | 26.0°C | |
| SEP 20 | 23.0°C | 26.0°C | |
| SEP 21 | 26.0°C | 23.1°C | |
| SEP 22 | 26.0°C | 23.2°C | |
| SEP 23 | 26.0°C | 23.4°C | |
| SEP 24 | 26.0°C | 23.5°C | |
| SEP 25 | 26.0°C | 23.7°C | |
| SEP 26 | 26.0°C | 23.8°C | |
| SEP 27 | 26.0°C | 24.0°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 | 0°C | 4°C | 9°C |
| February | 0°C | 3°C | 7°C |
| March | 2°C | 7°C | 12°C |
| April | 7°C | 12°C | 18°C |
| May | 14°C | 18°C | 22°C |
| June | 18°C | 23°C | 27°C |
| July | 21°C | 27°C | 33°C |
| August | 24°C | 27°C | 30°C |
| September | 21°C | 26°C | 31°C |
| October | 17°C | 20°C | 23°C |
| November | 9°C | 14°C | 18°C |
| December | 4°C | 8°C | 11°C |
Monroe Lake: Water Temperature by Location
Monroe Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Monroe Lake, a large reservoir in southern Indiana, experiences notable seasonal shifts in surface water temperature. In spring the surface generally warms from roughly 40–65°F (4–18°C) as runoff and air temperatures rise. Peak summer conditions commonly bring the warmest water, with surface temperatures typically in the 70–85°F range (21–29°C), making the lake most comfortable for swimming. Early fall usually sees a gradual cooling to about 60–75°F (16–24°C) before late fall and winter drop surface temperatures into the 32–45°F range (0–7°C), when the water becomes decidedly cold and near-freezing in the coldest periods.
Swimming is permitted at Monroe Lake in designated recreational areas because the reservoir is managed for public recreation, but conditions and rules vary by site. Designated beaches or swim zones are established to separate swimmers from boat traffic and to account for changing water levels; lifeguard coverage is not guaranteed at all locations, so many spots are swim-at-your-own-risk. Water temperature, boat traffic, currents near inlets and sudden drop-offs can affect safety, and occasional advisories or temporary closures may be issued for water-quality or safety reasons, so checking current local guidance before swimming is advisable.