Big Trout Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Big Trout Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Big Trout Lake today is 16.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 | 19.7°C | 19.8°C | |
| SEP 15 | 19.3°C | 19.8°C | |
| SEP 16 | 18.4°C | 19.8°C | |
| SEP 17 | 16.5°C | 19.8°C | |
| SEP 18 | 16.2°C | 19.8°C | |
| SEP 19 | 16.8°C | 19.8°C | |
| SEP 20 | 16.9°C | 19.8°C | |
| SEP 21 | 16.1°C | 19.8°C | |
| SEP 22 | 19.8°C | 16.3°C | |
| SEP 23 | 19.8°C | 16.5°C | |
| SEP 24 | 19.8°C | 16.7°C | |
| SEP 25 | 19.8°C | 16.8°C | |
| SEP 26 | 19.8°C | 17.0°C | |
| SEP 27 | 19.8°C | 17.2°C | |
| SEP 28 | 19.8°C | 17.4°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 | 2°C | 7°C | 12°C |
| February | 4°C | 10°C | 15°C |
| March | 0°C | 9°C | 17°C |
| April | 1°C | 11°C | 20°C |
| May | 6°C | 14°C | 21°C |
| June | 13°C | 18°C | 22°C |
| July | 17°C | 22°C | 27°C |
| August | 21°C | 25°C | 28°C |
| September | 17°C | 20°C | 23°C |
| October | 5°C | 12°C | 18°C |
| November | 4°C | 8°C | 12°C |
| December | 3°C | 7°C | 11°C |
Big Trout Lake: Water Temperature by Location
Big Trout Lake: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Big Trout Lake in northern Minnesota follows the state's seasonal pattern of cold winters and mild summers. During winter months the lake is typically ice-covered and surface water temperatures sit at or just above freezing near 32°F (0°C). In spring the water remains cold, often ranging from roughly 35–55°F (2–13°C) as the lake stratifies and warms. By midsummer surface temperatures commonly reach about 65–75°F (18–24°C), and in sheltered shallow bays water can briefly climb into the mid-70s°F (around 24–25°C) on hot, calm days. In fall the lake cools back toward the 45–60°F (7–15°C) window as the surface mixes with cooler inflows and air temperatures fall.
Swimming is generally possible and most comfortable during the ice-free summer months when surface temperatures are in the mid 60s–70s°F (18–24°C). Outside that period, swimming is limited by ice or by cold water that poses risks of hypothermia and reduced motor control. As with any natural lake, swimmers should observe posted advisories, watch for blue‑green algae blooms in late summer, respect water depth and underwater hazards, and use appropriate flotation or supervision if conditions or experience level warrant it.