Hayward Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Hayward Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Hayward Lake today is 22.3°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 |
|---|---|---|---|
| AUG 25 | 22.6°C | 24.0°C | |
| AUG 26 | 22.0°C | 24.0°C | |
| AUG 27 | 21.4°C | 24.0°C | |
| AUG 28 | 21.9°C | 24.0°C | |
| AUG 29 | 21.7°C | 24.0°C | |
| AUG 30 | 21.7°C | 24.0°C | |
| AUG 31 | 21.8°C | 24.0°C | |
| SEP 2 | 16.1°C | 22.0°C | |
| SEP 3 | 16.1°C | 21.7°C | |
| SEP 4 | 16.1°C | 21.4°C | |
| SEP 5 | 16.1°C | 21.1°C | |
| SEP 6 | 16.1°C | 20.8°C | |
| SEP 7 | 16.1°C | 20.4°C | |
| SEP 8 | 16.1°C | 20.1°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 | 3°C | 6°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 7°C |
| April | 1°C | 6°C | 11°C |
| May | 8°C | 13°C | 19°C |
| June | 16°C | 19°C | 22°C |
| July | 19°C | 23°C | 27°C |
| August | 18°C | 24°C | 30°C |
| September | 14°C | 16°C | 19°C |
| October | 9°C | 14°C | 18°C |
| November | 3°C | 8°C | 13°C |
| December | 0°C | 3°C | 7°C |
Hayward Lake: Water Temperature by Location
Hayward Lake: Weather Forecast
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September 6
Location & Local Information
Hayward Lake, near Hayward in northern Wisconsin, follows the seasonal pattern typical of small boreal-region lakes. In spring as ice breaks up surface temperatures often range from about 45–60°F (7–16°C). By early summer (June) the lake commonly warms to roughly 60–70°F (16–21°C), with peak summer highs in July and August frequently between 70–80°F (21–27°C) and occasionally touching the low 80s°F (27–29°C) in shallow bays on very warm years. During September and early October temperatures usually fall back to about 55–70°F (13–21°C), dropping below 50°F (10°C) by late fall before lakes freeze and winter surface temperatures reach near 32°F (0°C) under ice.
Swimming in Hayward Lake is generally possible during the ice-free months and is commonly practiced from public beaches and private shorelines when water temperatures are comfortable and conditions are safe. Local rules, posted advisories and water-quality reports determine whether specific sites are open; swimming may be discouraged during harmful algal blooms, heavy runoff events, or when lifeguard services are absent. Winter swimming is restricted by ice cover unless done safely with appropriate precautions and experience. Visitors should always heed local signage and recent water-quality or safety notices before entering the water.