Big Fish Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Big Fish Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Big Fish Lake today is 18.2°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 | 21.1°C | 20.7°C | |
| SEP 15 | 20.4°C | 20.7°C | |
| SEP 16 | 20.2°C | 20.7°C | |
| SEP 17 | 19.7°C | 20.7°C | |
| SEP 18 | 18.4°C | 20.7°C | |
| SEP 19 | 18.3°C | 20.7°C | |
| SEP 20 | 18.2°C | 20.7°C | |
| SEP 22 | 20.7°C | 18.3°C | |
| SEP 23 | 20.7°C | 18.5°C | |
| SEP 24 | 20.7°C | 18.6°C | |
| SEP 25 | 20.7°C | 18.7°C | |
| SEP 26 | 20.7°C | 18.8°C | |
| SEP 27 | 20.7°C | 19.0°C | |
| SEP 28 | 20.7°C | 19.1°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 | 1°C | 7°C | 12°C |
| February | 2°C | 9°C | 15°C |
| March | 0°C | 9°C | 17°C |
| April | 1°C | 11°C | 20°C |
| May | 7°C | 14°C | 21°C |
| June | 16°C | 19°C | 23°C |
| July | 17°C | 23°C | 29°C |
| August | 21°C | 25°C | 28°C |
| September | 18°C | 21°C | 24°C |
| October | 5°C | 12°C | 19°C |
| November | 3°C | 8°C | 11°C |
| December | 1°C | 5°C | 8°C |
Big Fish Lake: Water Temperature by Location
Big Fish Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Big Fish Lake in Minnesota follows the seasonal temperature patterns typical of small Midwestern lakes. In spring, surface temperatures usually climb from about 40–55°F (4–13°C) as ice melts and the water mixes. By mid to late summer the lake commonly reaches roughly 68–78°F (20–26°C) on average, with shallow bays occasionally warming toward 80°F (27°C) during hot spells. Early fall sees a steady cooling to about 45–60°F (7–16°C) before the surface drops rapidly as winter approaches. When the lake is ice-covered, surface temperatures are at or just above freezing (around 32°F / 0°C), while deeper water tends to remain near freshwater’s maximum density temperature of approximately 34–39°F (1–4°C).
Swimming is generally possible at Big Fish Lake during the warmer months and is commonly undertaken from public access points and private shorelines, but local conditions determine whether it’s advisable. Cold water in spring and late fall poses hypothermia risks, and winter ice makes open-water swimming unsafe. Water-quality advisories for algal blooms, high bacteria counts, or other hazards can temporarily close affected areas, and most beaches lack lifeguards, so swimmers should check current local advisories, heed posted signs, and use common-sense safety measures before entering the water.