Butternut Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Butternut Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Butternut Lake today is 20.8°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 |
|---|---|---|---|
| JUN 3 | 16.4°C | 18.0°C | |
| JUN 4 | 16.4°C | 18.0°C | |
| JUN 5 | 16.6°C | 18.0°C | |
| JUN 6 | 16.6°C | 18.0°C | |
| JUN 7 | 20.6°C | 18.0°C | |
| JUN 8 | 20.6°C | 18.0°C | |
| JUN 11 | 18.0°C | 20.7°C | |
| JUN 12 | 18.0°C | 20.5°C | |
| JUN 13 | 18.0°C | 20.4°C | |
| JUN 14 | 18.0°C | 20.2°C | |
| JUN 15 | 18.0°C | 20.1°C | |
| JUN 16 | 18.0°C | 20.0°C | |
| JUN 17 | 18.0°C | 19.8°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 | 5°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 2°C | 5°C |
| April | 1°C | 5°C | 10°C |
| May | 6°C | 12°C | 18°C |
| June | 15°C | 18°C | 21°C |
| July | 18°C | 23°C | 27°C |
| August | 18°C | 24°C | 30°C |
| September | 14°C | 16°C | 19°C |
| October | 9°C | 13°C | 17°C |
| November | 4°C | 9°C | 13°C |
| December | 0°C | 3°C | 6°C |
Butternut Lake: Water Temperature by Location
Butternut Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Butternut Lake in Wisconsin typically follows the seasonal temperature patterns of midwestern glacial lakes. In winter the lake is often at or just below freezing at the surface (32°F / 0°C) and can be ice‑covered. As ice melts in spring, surface temperatures commonly rise from about 40–60°F (4–15°C). During summer the warmest surface readings usually occur, often ranging from roughly 65–80°F (18–27°C) on typical warm days and occasionally climbing into the low 80s°F (~27–28°C) in shallow, calm conditions. Deeper water remains considerably cooler year‑round; summer bottom temperatures can stay around 45–55°F (7–13°C). In fall the lake cools back toward 50–65°F (10–18°C) before refreezing.
Swimming at Butternut Lake is generally possible during the ice‑free months because surface temperatures in summer and late spring/early fall reach levels comfortable for most swimmers. Public access points and informal shorelines are commonly used for swimming, though local rules, beach postings, and water‑quality advisories should be checked beforehand. Cold water below the surface and rapid weather changes mean caution is warranted; hypothermia is a risk in cooler conditions even if the surface feels warm.