Pool 7 Lake Onalaska — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Pool 7 Lake Onalaska, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Pool 7 Lake Onalaska today is 26.3°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 | 27.1°C | 25.5°C | |
| AUG 5 | 27.0°C | 25.5°C | |
| AUG 6 | 26.7°C | 25.5°C | |
| AUG 7 | 26.5°C | 25.5°C | |
| AUG 8 | 26.5°C | 25.5°C | |
| AUG 9 | 26.8°C | 25.5°C | |
| AUG 10 | 26.7°C | 25.5°C | |
| AUG 11 | 26.2°C | 25.5°C | |
| AUG 12 | 25.5°C | 26.3°C | |
| AUG 13 | 25.5°C | 26.2°C | |
| AUG 14 | 25.5°C | 26.2°C | |
| AUG 15 | 25.5°C | 26.1°C | |
| AUG 16 | 25.5°C | 26.1°C | |
| AUG 17 | 25.5°C | 26.1°C | |
| AUG 18 | 25.5°C | 26.0°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 | 1°C | 3°C |
| March | 0°C | 4°C | 8°C |
| April | 1°C | 8°C | 16°C |
| May | 11°C | 17°C | 23°C |
| June | 16°C | 20°C | 24°C |
| July | 23°C | 26°C | 30°C |
| August | 21°C | 26°C | 30°C |
| September | 14°C | 18°C | 21°C |
| October | 9°C | 14°C | 19°C |
| November | 2°C | 8°C | 13°C |
| December | 0°C | 1°C | 2°C |
Pool 7 Lake Onalaska: Water Temperature by Location
Pool 7 Lake Onalaska: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Pool 7 / Lake Onalaska is a broad backwater of the Mississippi River with fairly variable surface temperatures through the year. In winter surface water often sits near freezing, roughly 32–40°F (0–4°C). Spring warming typically brings temperatures into the 40–65°F (4–18°C) range as inflows and sun angle increase. Peak summer surface readings in sheltered, shallow bays commonly reach about 70–85°F (21–29°C), though deeper or wind‑exposed areas can be several degrees cooler. By fall the surface generally cools back toward 50–65°F (10–18°C). Because much of the lake is shallow and wind‑mixed, temperatures can change quickly with weather, and strong vertical stratification is uncommon except in the warmest, protected coves.
Swimming is generally permitted in Lake Onalaska because it is a public waterbody, and during warm months people commonly enter the water at parks and shoreline access points. However, there are no universal lifeguarded areas across the entire lake, and local rules, posted advisories, or temporary beach closures may limit swimming for safety or water‑quality reasons. Hazards include boat traffic, submerged structure, changing currents near navigation channels, and occasional algal blooms or elevated bacteria following heavy rains, so swimmers should use designated access points, heed posted notices, and exercise caution.