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 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 | 20.7°C | 20.0°C | |
| OCT 6 | 20.3°C | 20.0°C | |
| OCT 7 | 20.0°C | 20.0°C | |
| OCT 8 | 19.3°C | 20.0°C | |
| OCT 9 | 19.5°C | 20.0°C | |
| OCT 10 | 18.9°C | 20.0°C | |
| OCT 11 | 19.2°C | 20.0°C | |
| OCT 12 | 18.5°C | 20.0°C | |
| OCT 13 | 20.0°C | 18.5°C | |
| OCT 14 | 20.0°C | 18.6°C | |
| OCT 15 | 20.0°C | 18.6°C | |
| OCT 16 | 20.0°C | 18.7°C | |
| OCT 17 | 20.0°C | 18.8°C | |
| OCT 18 | 20.0°C | 18.9°C | |
| OCT 19 | 20.0°C | 19.0°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
October 13
October 14
October 15
October 16
October 17
October 18
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.