Saint Croix Flowage Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Saint Croix Flowage Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Saint Croix Flowage Lake today is 21.5°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 23 | 19.2°C | 18.3°C | |
| JUN 24 | 19.5°C | 18.3°C | |
| JUN 25 | 19.5°C | 18.3°C | |
| JUN 26 | 19.8°C | 18.3°C | |
| JUN 27 | 20.0°C | 18.3°C | |
| JUN 28 | 20.3°C | 18.3°C | |
| JUN 29 | 20.6°C | 18.3°C | |
| JUN 30 | 20.6°C | 18.3°C | |
| JUL 1 | 23.5°C | 21.6°C | |
| JUL 2 | 23.5°C | 21.7°C | |
| JUL 3 | 23.5°C | 21.8°C | |
| JUL 4 | 23.5°C | 21.9°C | |
| JUL 5 | 23.5°C | 22.0°C | |
| JUL 6 | 23.5°C | 22.1°C | |
| JUL 7 | 23.5°C | 22.2°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 | 3°C | 6°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 2°C | 5°C |
| April | 1°C | 6°C | 12°C |
| May | 7°C | 13°C | 19°C |
| June | 15°C | 18°C | 22°C |
| July | 20°C | 24°C | 27°C |
| August | 19°C | 25°C | 30°C |
| September | 14°C | 16°C | 19°C |
| October | 9°C | 14°C | 18°C |
| November | 2°C | 8°C | 13°C |
| December | 0°C | 3°C | 6°C |
Saint Croix Flowage Lake: Water Temperature by Location
Saint Croix Flowage Lake: Weather Forecast
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July 6
Location & Local Information
Lake of the Saint Croix Flowage experiences typical Upper Midwest seasonal changes in surface water temperature. In spring the surface often sits around 40–60°F (4–16°C) as the water seasonally stratifies, warming through May and June. Summer surface temperatures commonly range from about 70–80°F (21–27°C) on warm afternoons, with sheltered bays sometimes warming a bit higher and deeper areas remaining noticeably cooler. By early fall the surface cools to roughly 50–65°F (10–18°C) before lakes freeze; winter conditions bring ice cover and near‑freezing water at about 32°F (0°C) or slightly below under the ice. Temperatures can vary by depth, time of day, and local weather, and shallow, sun‑exposed areas warm fastest.
Swimming is generally allowed and is a popular recreational activity in summer because surface temperatures frequently reach levels comfortable for bathing. Public access points and beaches provide places to swim, but users should heed posted rules and local health advisories, since water quality can vary and occasional blue‑green algal blooms or boat traffic may create hazards. Near dams, spillways, and strong currents swimming is unsafe, and winter ice makes open‑water swimming impractical except for specialized, supervised events. Checking current conditions before entering the water is recommended.