Pool 9 Lake Winneshiek — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Pool 9 Lake Winneshiek, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Pool 9 Lake Winneshiek today is 19.3°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 | 21.0°C | 18.9°C | |
| SEP 15 | 21.0°C | 18.9°C | |
| SEP 16 | 19.7°C | 18.9°C | |
| SEP 17 | 19.9°C | 18.9°C | |
| SEP 18 | 19.8°C | 18.9°C | |
| SEP 19 | 19.7°C | 18.9°C | |
| SEP 20 | 19.5°C | 18.9°C | |
| SEP 21 | 19.3°C | 18.9°C | |
| SEP 22 | 18.9°C | 19.3°C | |
| SEP 23 | 18.9°C | 19.3°C | |
| SEP 24 | 18.9°C | 19.2°C | |
| SEP 25 | 18.9°C | 19.2°C | |
| SEP 26 | 18.9°C | 19.2°C | |
| SEP 27 | 18.9°C | 19.2°C | |
| SEP 28 | 18.9°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 | 2°C | 4°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 4°C | 8°C |
| April | 1°C | 9°C | 16°C |
| May | 11°C | 17°C | 23°C |
| June | 16°C | 20°C | 24°C |
| July | 21°C | 25°C | 29°C |
| August | 21°C | 26°C | 30°C |
| September | 14°C | 19°C | 24°C |
| October | 9°C | 14°C | 19°C |
| November | 3°C | 8°C | 13°C |
| December | 0°C | 2°C | 4°C |
Pool 9 Lake Winneshiek: Water Temperature by Location
Pool 9 Lake Winneshiek: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Lake Winneshiek in Pool 9 typically follows the seasonal temperature patterns of upper Midwestern river pools. During winter the surface commonly hovers around freezing, about 32°F (0°C), and can stay at or just above that mark where open water persists. In spring, as meltwater and runoff mix in, surface temperatures commonly rise into the 40s to mid-50s°F (roughly 4–13°C) but remain chilly for swimming. Summer brings the warmest conditions, with surface readings often in the upper 60s to upper 70s°F (about 20–26°C) and occasionally reaching the low 80s°F (27–28°C) on hot, stagnant days; deeper or shaded channels stay noticeably cooler. In autumn the lake cools back through the 40s and 50s°F (around 7–15°C) as air temperatures drop and stratification breaks down.
Swimming is possible during warmer months when surface temperatures are comfortable, but there are practical and safety considerations. Pool 9 is part of a river impoundment with boat traffic, variable currents, submerged structure and vegetation, and limited or no lifeguarded beaches in many spots, so formal public bathing areas may be few. Water quality can vary with runoff and occasional algal events, so local advisories or posted rules should be checked; where local authorities or landowners permit it and conditions are safe, recreational swimming is allowed, but caution and awareness are advised.