Lower Nemahbin Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lower Nemahbin Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lower Nemahbin 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 |
|---|---|---|---|
| SEP 20 | 18.9°C | 21.0°C | |
| SEP 21 | 19.4°C | 21.0°C | |
| SEP 22 | 19.6°C | 21.0°C | |
| SEP 23 | 19.4°C | 21.0°C | |
| SEP 24 | 19.0°C | 21.0°C | |
| SEP 25 | 18.8°C | 21.0°C | |
| SEP 26 | 18.1°C | 21.0°C | |
| SEP 27 | 18.4°C | 21.0°C | |
| SEP 28 | 21.0°C | 18.3°C | |
| SEP 29 | 21.0°C | 18.2°C | |
| SEP 30 | 21.0°C | 18.1°C | |
| OCT 1 | 16.5°C | 18.0°C | |
| OCT 2 | 16.5°C | 17.9°C | |
| OCT 3 | 16.5°C | 17.8°C | |
| OCT 4 | 16.5°C | 17.7°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 | 2°C | 4°C |
| February | 1°C | 4°C | 6°C |
| March | 1°C | 5°C | 8°C |
| April | 5°C | 9°C | 13°C |
| May | 7°C | 13°C | 19°C |
| June | 16°C | 19°C | 23°C |
| July | 20°C | 25°C | 30°C |
| August | 22°C | 25°C | 27°C |
| September | 18°C | 21°C | 24°C |
| October | 13°C | 17°C | 20°C |
| November | 3°C | 9°C | 15°C |
| December | 0°C | 3°C | 6°C |
Lower Nemahbin Lake: Water Temperature by Location
Lower Nemahbin Lake: Weather Forecast
September 27
September 28
September 29
September 30
October 1
Location & Local Information
Lower Nemahbin Lake, located in southeastern Wisconsin, experiences typical seasonal temperature swings for a midwestern inland lake. In spring the surface usually warms from the low 40s to around 60°F (4–16°C) as ice recedes and runoff cools the water. Summer brings the warmest conditions, with surface temperatures commonly in the 70s to low 80s °F (21–28°C) and occasionally reaching the mid-80s °F (around 29°C) in shallow, sunlit bays. In early fall the water cools back into the 50s and 60s °F (10–18°C) before winter sets in, when the lake is often ice-covered and under-ice temperatures hover near freezing, roughly 32–39°F (0–4°C).
Swimming in Lower Nemahbin is generally permitted and popular in summer because surface temperatures typically reach comfortable ranges for recreational bathing. There are public-access shoreline areas and residents commonly swim when conditions are favorable. However, local health or safety advisories can temporarily restrict swimming for reasons such as algal blooms, elevated bacteria after heavy rains, or hazardous conditions, and cold water in spring and fall increases the risk of cold shock and hypothermia. In winter, open-water swimming is unsafe due to ice and near-freezing water temperatures, so swimmers should follow posted guidance and check current water-quality and safety notices before entering.