Bear Island Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Bear Island Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Bear Island Lake today is 20.2°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 | 20.8°C | 23.5°C | |
| AUG 25 | 20.3°C | 23.5°C | |
| AUG 26 | 19.9°C | 23.5°C | |
| AUG 27 | 20.0°C | 23.5°C | |
| AUG 28 | 20.4°C | 23.5°C | |
| AUG 29 | 20.4°C | 23.5°C | |
| AUG 30 | 20.3°C | 23.5°C | |
| AUG 31 | 20.4°C | 23.5°C | |
| SEP 1 | 16.1°C | 20.0°C | |
| SEP 2 | 16.1°C | 19.8°C | |
| SEP 3 | 16.1°C | 19.6°C | |
| SEP 4 | 16.1°C | 19.4°C | |
| SEP 5 | 16.1°C | 19.2°C | |
| SEP 6 | 16.1°C | 19.0°C | |
| SEP 7 | 16.1°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 | 3°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 1°C | 3°C |
| April | 1°C | 4°C | 7°C |
| May | 3°C | 10°C | 16°C |
| June | 14°C | 18°C | 21°C |
| July | 16°C | 22°C | 27°C |
| August | 17°C | 24°C | 30°C |
| September | 14°C | 16°C | 19°C |
| October | 9°C | 13°C | 17°C |
| November | 2°C | 7°C | 11°C |
| December | 0°C | 2°C | 4°C |
Bear Island Lake: Water Temperature by Location
Bear Island Lake: Weather Forecast
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September 6
Location & Local Information
Bear Island Lake in Minnesota follows the familiar seasonal rhythm of northern lakes, with water temperatures that change markedly through the year. After ice-out in spring, surface temperatures are commonly in the 40s to mid-50s °F (4–13 °C) and gradually warm into early summer. By July and August, typical surface readings for recreational areas often range from about 65–75 °F (18–24 °C), though shallow bays and warm spells can push parts of the lake into the upper 70s or low 80s °F (25–28 °C). As autumn arrives the lake cools back down through the 50s °F (10–15 °C) and eventually refreezes; under ice in winter the water remains just above freezing, roughly in the low 30s to near 39 °F (0–4 °C) near the bottom.
Swimming in Bear Island Lake is generally possible and commonly done during the warm summer months when surface temperatures are most comfortable. Access and use depend on shoreline ownership and any local rules, and swimmers should heed posted advisories about water quality (for example, algal blooms or bacterial concerns) and watch for cold-water shock in shoulder seasons when temperatures are still low. Ice swimming or entering near-freezing water carries significant hypothermia risk and should be avoided without proper training and safety precautions.