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 26.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 |
|---|---|---|---|
| AUG 4 | 26.9°C | 25.5°C | |
| AUG 5 | 26.7°C | 25.5°C | |
| AUG 6 | 26.7°C | 25.5°C | |
| AUG 7 | 26.7°C | 25.5°C | |
| AUG 8 | 26.6°C | 25.5°C | |
| AUG 9 | 26.6°C | 25.5°C | |
| AUG 10 | 26.7°C | 25.5°C | |
| AUG 11 | 26.6°C | 25.5°C | |
| AUG 12 | 25.5°C | 26.5°C | |
| AUG 13 | 25.5°C | 26.5°C | |
| AUG 14 | 25.5°C | 26.4°C | |
| AUG 15 | 25.5°C | 26.4°C | |
| AUG 16 | 25.5°C | 26.3°C | |
| AUG 17 | 25.5°C | 26.3°C | |
| AUG 18 | 25.5°C | 26.2°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 | 18°C | 21°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
August 12
August 13
August 14
August 15
August 16
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.