Lake Winona — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Winona, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Winona today is 19.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| SEP 14 | 20.1°C | 19.4°C | |
| SEP 15 | 20.2°C | 19.4°C | |
| SEP 16 | 20.2°C | 19.4°C | |
| SEP 17 | 19.0°C | 19.4°C | |
| SEP 18 | 18.8°C | 19.4°C | |
| SEP 19 | 19.3°C | 19.4°C | |
| SEP 20 | 19.4°C | 19.4°C | |
| SEP 22 | 19.4°C | 19.5°C | |
| SEP 23 | 19.4°C | 19.5°C | |
| SEP 24 | 19.4°C | 19.5°C | |
| SEP 25 | 19.4°C | 19.5°C | |
| SEP 26 | 19.4°C | 19.5°C | |
| SEP 27 | 19.4°C | 19.5°C | |
| SEP 28 | 19.4°C | 19.5°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 | 4°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 4°C | 8°C |
| April | 1°C | 8°C | 16°C |
| May | 10°C | 16°C | 23°C |
| June | 16°C | 20°C | 24°C |
| July | 23°C | 26°C | 30°C |
| August | 22°C | 26°C | 30°C |
| September | 14°C | 19°C | 25°C |
| October | 9°C | 14°C | 19°C |
| November | 2°C | 8°C | 13°C |
| December | 0°C | 1°C | 2°C |
Lake Winona: Water Temperature by Location
Lake Winona: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Lake Winona’s water temperatures follow the seasonal pattern typical of small Midwestern lakes. During summer the surface commonly warms to about 65–80°F (18–27°C) on warm, sunny days, providing the most comfortable conditions for swimming. In spring temperatures rise from roughly 35–60°F (2–15°C) as ice melts and the lake stratifies, while fall sees a steady cooling to about 50–65°F (10–18°C) before freeze-up. In winter the lake commonly develops ice cover and surface water is at or near freezing, around 32°F (0°C); water just below the ice typically holds between about 34–39°F (1–4°C), reflecting the density characteristics of cold freshwater.
Swimming in and around Lake Winona is generally possible during the ice-free months at public access points and designated beaches, but it depends on weather, water quality, and local management decisions. Authorities may close swimming areas temporarily for reasons such as high bacteria counts or harmful algal blooms, and winter ice cover makes traditional swimming unsafe. Cold-water immersion even in spring or fall can pose risks like cold shock and hypothermia, so swimmers should follow posted advisories and use common-sense precautions regarding temperature, conditions, and safety equipment.