Spirit River Flowage Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Spirit River Flowage Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Spirit River Flowage Lake today is 21.4°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 | 18.0°C | 18.6°C | |
| JUN 4 | 18.0°C | 18.6°C | |
| JUN 5 | 18.1°C | 18.6°C | |
| JUN 6 | 18.2°C | 18.6°C | |
| JUN 7 | 18.5°C | 18.6°C | |
| JUN 8 | 18.5°C | 18.6°C | |
| JUN 11 | 18.6°C | 21.3°C | |
| JUN 12 | 18.6°C | 21.1°C | |
| JUN 13 | 18.6°C | 21.0°C | |
| JUN 14 | 18.6°C | 20.8°C | |
| JUN 15 | 18.6°C | 20.7°C | |
| JUN 16 | 18.6°C | 20.6°C | |
| JUN 17 | 18.6°C | 20.4°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 | 2°C | 4°C |
| March | 0°C | 2°C | 4°C |
| April | 1°C | 7°C | 14°C |
| May | 6°C | 12°C | 19°C |
| June | 16°C | 19°C | 22°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 | 14°C | 18°C |
| November | 2°C | 8°C | 14°C |
| December | 0°C | 2°C | 4°C |
Spirit River Flowage Lake: Water Temperature by Location
Spirit River Flowage Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Spirit River Flowage, like many inland flowages in northern Wisconsin, experiences a strong seasonal swing in surface water temperature. In spring the water is cold, often ranging from about 40–60°F (4–15°C) as runoff and cool air keep temperatures low. By summer surface readings commonly climb into the mid-60s to upper-70s Fahrenheit (18–26°C), with peak warm spells pushing localized shallows toward 80°F (27°C). In early fall the surface cools back to roughly 50–65°F (10–18°C) before winter brings near-freezing conditions around 32–36°F (0–2°C) and persistent ice cover. Deeper areas can retain cooler water through summer due to stratification, so swimmers may notice sharp temperature changes with depth.
Swimming in Spirit River Flowage is generally possible during the ice-free months because it is a public recreational waterbody, but there are few formal lifeguarded beaches and conditions vary. People swim when surface temperatures are in the comfortable summer range, but users should be mindful of boat traffic, submerged vegetation, sudden drop-offs and variable water quality; late-summer algal blooms can occasionally limit use. Ice cover in winter makes open-water swimming unsafe without specialized training and equipment. As with any natural water, checking local advisories and exercising normal water-safety precautions is recommended.