Chequamegon Bay — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Chequamegon Bay, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Chequamegon Bay today is 20.1°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 | 17.5°C | |
| JUN 4 | 17.2°C | 17.5°C | |
| JUN 5 | 17.4°C | 17.5°C | |
| JUN 6 | 17.6°C | 17.5°C | |
| JUN 7 | 18.0°C | 17.5°C | |
| JUN 8 | 19.9°C | 17.5°C | |
| JUN 10 | 20.1°C | 17.5°C | |
| JUN 11 | 17.5°C | 20.0°C | |
| JUN 12 | 17.5°C | 19.8°C | |
| JUN 13 | 17.5°C | 19.7°C | |
| JUN 14 | 17.5°C | 19.6°C | |
| JUN 15 | 17.5°C | 19.5°C | |
| JUN 16 | 17.5°C | 19.3°C | |
| JUN 17 | 17.5°C | 19.2°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 | 1°C | 3°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 2°C | 4°C |
| April | 1°C | 7°C | 14°C |
| May | 6°C | 13°C | 19°C |
| June | 14°C | 18°C | 21°C |
| July | 17°C | 22°C | 27°C |
| August | 16°C | 23°C | 30°C |
| September | 14°C | 16°C | 19°C |
| October | 9°C | 13°C | 17°C |
| November | 2°C | 9°C | 15°C |
| December | 0°C | 0°C | 2°C |
Chequamegon Bay: Water Temperature by Location
Chequamegon Bay: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Chequamegon Bay is the sheltered embayment of Lake Superior along northern Wisconsin, and its water temperatures reflect both the big lake’s cold character and the bay’s shallower, more variable conditions. Typical seasonal surface temperatures range from near freezing in winter (around 32°F / 0°C with frequent ice or slush) to the low 40s–mid 50s°F (5–13°C) in spring and early summer as the lake stratifies. Peak summer temperatures in the warmest nearshore spots of the bay commonly reach roughly 55–68°F (13–20°C) during July and August, though open-water areas usually remain on the cooler end. By fall the surface cools back into the 40s°F (4–9°C) as the lake mixes.
Swimming in Chequamegon Bay is generally allowed and many public beaches and parks near Bayfield and Ashland welcome swimmers, with local authorities monitoring water quality and issuing advisories when necessary. However, the bay’s temperatures—even at summer peaks—are much colder than typical inland swimming lakes, so risks such as cold shock and rapid hypothermia exist. Swimmers should choose supervised beaches when available, limit time in the water, wear protective gear like wetsuits for longer swims, and heed local advisories for water quality, weather, and ice conditions in shoulder seasons.