Black Duck Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Black Duck Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Black Duck Lake today is 18.1°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 | 14.2°C | 20.0°C | |
| JUN 4 | 14.3°C | 20.0°C | |
| JUN 5 | 14.8°C | 20.0°C | |
| JUN 6 | 15.6°C | 20.0°C | |
| JUN 7 | 15.9°C | 20.0°C | |
| JUN 8 | 17.9°C | 20.0°C | |
| JUN 11 | 20.0°C | 18.2°C | |
| JUN 12 | 20.0°C | 18.3°C | |
| JUN 13 | 20.0°C | 18.4°C | |
| JUN 14 | 20.0°C | 18.5°C | |
| JUN 15 | 20.0°C | 18.6°C | |
| JUN 16 | 20.0°C | 18.7°C | |
| JUN 17 | 20.0°C | 18.8°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 | 4°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 2°C | 4°C |
| April | 0°C | 5°C | 10°C |
| May | 2°C | 11°C | 19°C |
| June | 13°C | 20°C | 27°C |
| July | 19°C | 23°C | 27°C |
| August | 19°C | 24°C | 28°C |
| September | 16°C | 20°C | 23°C |
| October | 6°C | 12°C | 17°C |
| November | 2°C | 7°C | 11°C |
| December | 0°C | 3°C | 6°C |
Black Duck Lake: Water Temperature by Location
Black Duck Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Blackduck Lake in northern Minnesota follows the seasonal temperature cycle typical of shallow glacial lakes in the region. After ice-out in spring, surface water tends to be cool, often in the 40–55°F range (4–13°C). By early summer surface temperatures commonly warm into the 60–70°F band (16–21°C), with midsummer highs frequently reaching about 68–78°F (20–26°C) in sheltered bays and shallower areas. In autumn the lake cools back toward 50–60°F (10–16°C) before freezing over; under winter ice the near-surface temperature is at or just above 32°F (0°C) while deeper water typically remains around 39–45°F (4–7°C) year‑round due to thermal stratification.
Swimming is generally allowed on Blackduck Lake during the ice‑free months because it is a public natural lake, but conditions determine whether it is advisable. Most people find the warmest mid‑July and August water temperatures most comfortable for bathing. Outside that window, cold water increases the risk of cold shock and hypothermia, and spring or late‑season swims can be uncomfortable or dangerous. Local advisories about water quality, harmful algal blooms, or private shoreline restrictions can also affect whether specific access points are usable, so swimmers should check current local guidance and exercise normal safety precautions.