Fish Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Fish Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Fish Lake today is 21.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 24 | 20.7°C | 22.9°C | |
| AUG 25 | 18.8°C | 22.9°C | |
| AUG 26 | 18.7°C | 22.9°C | |
| AUG 27 | 18.6°C | 22.9°C | |
| AUG 28 | 20.2°C | 22.9°C | |
| AUG 29 | 20.9°C | 22.9°C | |
| AUG 30 | 20.9°C | 22.9°C | |
| AUG 31 | 21.6°C | 22.9°C | |
| SEP 1 | 19.5°C | 21.3°C | |
| SEP 2 | 19.5°C | 21.2°C | |
| SEP 3 | 19.5°C | 21.1°C | |
| SEP 4 | 19.5°C | 21.0°C | |
| SEP 5 | 19.5°C | 20.9°C | |
| SEP 6 | 19.5°C | 20.8°C | |
| SEP 7 | 19.5°C | 20.7°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 | 3°C | 6°C |
| February | 1°C | 4°C | 7°C |
| March | 3°C | 6°C | 8°C |
| April | 4°C | 9°C | 14°C |
| May | 9°C | 13°C | 18°C |
| June | 15°C | 20°C | 24°C |
| July | 15°C | 23°C | 30°C |
| August | 18°C | 23°C | 27°C |
| September | 15°C | 20°C | 24°C |
| October | 11°C | 15°C | 18°C |
| November | 4°C | 8°C | 11°C |
| December | 0°C | 2°C | 5°C |
Fish Lake: Water Temperature by Location
Fish Lake: Weather Forecast
September 1
September 2
September 3
September 4
September 5
Location & Local Information
Fish Lake in Wisconsin follows the typical seasonal pattern for midwestern lakes. During winter it is commonly near freezing beneath ice, roughly 32–37°F (0–3°C). Spring brings a steady warm-up as ice melts and surface temperatures commonly move from about 35–55°F (2–13°C). In summer the sun-warmed surface frequently reaches a comfortable 68–80°F (20–27°C), and during hot spells can climb into the low 80s°F (around 28–30°C); deeper water generally remains much colder because of stratification. By autumn the surface cools again, often falling into the 40–60°F range (4–15°C) as the lake mixes.
Swimming is generally possible and commonly done during the open-water months when surface temperatures are warm enough for comfort, roughly when waters exceed about 68°F (20°C). Local public beaches or access points typically permit swimming, but conditions and rules vary by shoreline owner or municipality, so posted signs and water-quality advisories should be checked. Even in summer, swimmers should be aware that thermoclines and cooler deep water can cause sudden cold exposure, and ice cover in winter makes swimming unsafe except for controlled, specialized activities. Safety, local regulations and current water conditions determine whether swimming is advisable at any given time.