Little Saint Germain Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Little Saint Germain Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Little Saint Germain Lake today is 19.1°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 |
|---|---|---|---|
| JUN 3 | 18.5°C | 18.0°C | |
| JUN 4 | 18.5°C | 18.0°C | |
| JUN 5 | 18.9°C | 18.0°C | |
| JUN 6 | 18.9°C | 18.0°C | |
| JUN 7 | 19.2°C | 18.0°C | |
| JUN 8 | 19.2°C | 18.0°C | |
| JUN 11 | 18.0°C | 19.0°C | |
| JUN 12 | 18.0°C | 19.0°C | |
| JUN 13 | 18.0°C | 18.9°C | |
| JUN 14 | 18.0°C | 18.9°C | |
| JUN 15 | 18.0°C | 18.8°C | |
| JUN 16 | 18.0°C | 18.8°C | |
| JUN 17 | 18.0°C | 18.7°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 | 3°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 3°C | 6°C |
| April | 1°C | 4°C | 8°C |
| May | 6°C | 12°C | 18°C |
| June | 15°C | 18°C | 21°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 | 13°C | 17°C |
| November | 4°C | 9°C | 13°C |
| December | 0°C | 3°C | 6°C |
Little Saint Germain Lake: Water Temperature by Location
Little Saint Germain Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Little Saint Germain Lake, in northern Wisconsin, follows the typical seasonal pattern of temperate inland lakes. Surface water temperatures are near freezing under winter ice, around 32°F (0°C). In spring the lake warms slowly, often ranging from about 36–60°F (2–16°C) as snowmelt and cool air persist. By summer the top layer commonly reaches comfortable swimming levels, with typical surface temperatures between roughly 68–78°F (20–26°C) during June through August; occasional heat waves can push values toward the upper end. In autumn the surface cools again, generally falling into the 40–60°F (4–16°C) range as air temperatures drop and turnover begins.
Swimming in Little Saint Germain Lake is generally permitted and commonly enjoyed when conditions allow, because the lake has accessible shoreline and no blanket legal prohibition on recreational swimming. That said, people should swim when surface temperatures are warm enough for comfort and safety, usually in mid-summer, and always heed local signage or advisories. Water quality, algal blooms, boat traffic, depth changes, and cold pockets near inlets can affect safety, so swimmers are advised to use designated swimming areas if available, watch for posted rules, and be mindful of hypothermia risk when entering cooler spring or fall water.