Upper Nemahbin Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Upper Nemahbin Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Upper Nemahbin Lake today is 23.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 |
|---|---|---|---|
| AUG 24 | 24.6°C | 24.5°C | |
| AUG 25 | 25.4°C | 24.5°C | |
| AUG 26 | 25.3°C | 24.5°C | |
| AUG 27 | 24.0°C | 24.5°C | |
| AUG 28 | 24.1°C | 24.5°C | |
| AUG 29 | 23.8°C | 24.5°C | |
| AUG 30 | 23.8°C | 24.5°C | |
| AUG 31 | 23.8°C | 24.5°C | |
| SEP 1 | 20.0°C | 23.6°C | |
| SEP 2 | 20.0°C | 23.4°C | |
| SEP 3 | 20.0°C | 23.2°C | |
| SEP 4 | 20.0°C | 23.0°C | |
| SEP 5 | 20.0°C | 22.9°C | |
| SEP 6 | 20.0°C | 22.7°C | |
| SEP 7 | 20.0°C | 22.5°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 | 20°C | 22°C |
| October | 13°C | 17°C | 20°C |
| November | 3°C | 9°C | 15°C |
| December | 0°C | 3°C | 6°C |
Upper Nemahbin Lake: Water Temperature by Location
Upper Nemahbin Lake: Weather Forecast
September 1
September 2
September 3
September 4
September 5
Location & Local Information
Upper Nemahbin Lake in Wisconsin experiences pronounced seasonal variation in surface water temperature. In late spring the lake typically warms from near 40–55°F (4–13°C) as ice-out gives way to warming air; by midsummer surface temperatures commonly reach about 70–80°F (21–27°C), which is when the water feels most comfortable for recreational swimming. In early fall the surface cools back into the 50–65°F range (10–18°C) before winter sets in; under ice in the coldest months the water column near the bottom will be close to freshwater maximum density around 39°F (4°C) while surface ice stays at or near 32°F (0°C).
Swimming is generally possible in Upper Nemahbin where shore access or boat landings exist, but it is subject to local access rules, posted advisories and water-quality conditions. Summer is the prime season for swimming because warmer surface temperatures reduce immediate cold-shock and hypothermia risk, whereas spring, fall and winter waters are cold enough to significantly shorten safe swim times and increase risk. Swimmers should heed local signage, watch for aquatic vegetation and boat traffic, and take standard safety precautions such as not swimming alone and limiting exposure time in cooler water.