Catgut Slough Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Catgut Slough Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Catgut Slough Lake today is 18.7°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 | 19.9°C | 19.3°C | |
| SEP 15 | 20.1°C | 19.3°C | |
| SEP 16 | 19.8°C | 19.3°C | |
| SEP 17 | 18.7°C | 19.3°C | |
| SEP 18 | 19.0°C | 19.3°C | |
| SEP 19 | 19.4°C | 19.3°C | |
| SEP 20 | 19.3°C | 19.3°C | |
| SEP 21 | 18.7°C | 19.3°C | |
| SEP 22 | 19.3°C | 18.7°C | |
| SEP 23 | 19.3°C | 18.8°C | |
| SEP 24 | 19.3°C | 18.8°C | |
| SEP 25 | 19.3°C | 18.8°C | |
| SEP 26 | 19.3°C | 18.9°C | |
| SEP 27 | 19.3°C | 18.9°C | |
| SEP 28 | 19.3°C | 18.9°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 | 25°C |
| July | 23°C | 26°C | 29°C |
| August | 21°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 | 0°C | 2°C |
Catgut Slough Lake: Water Temperature by Location
Catgut Slough Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Catgut Slough in Wisconsin is a small, shallow inland slough whose surface temperatures follow the typical seasonal pattern of Midwestern wetlands. In spring, as ice melts and runoff cools the water, surface temperatures commonly range from about 40–55°F (4–13°C). In summer, shallow basins can warm considerably, often reaching 68–78°F (20–26°C) on warm days, though localized warm spots may climb into the low 80s°F (27–28°C) in heat waves. Autumn sees a steady decline to roughly 45–60°F (7–16°C) as air temperatures fall. In winter the slough frequently freezes; open-water surface temperatures that persist just before freeze or under ice are near 32–36°F (0–2°C).
Swimming at Catgut Slough depends on ownership, local regulations, and conditions rather than a blanket prohibition. Because it is shallow and vegetation-rich, the slough can heat and cool quickly and can support abundant aquatic plants and algae, which may make swimming unpleasant or unsafe at times. Water quality, presence of submerged vegetation, limited shore facilities, and ice in winter all affect whether swimming is advisable. If shore access is public and water quality is acceptable, informal swimming may occur in summer, but visitors should check local guidance, watch for algae blooms, and consider that colder, sudden temperature changes and underwater hazards are common.