Big Carnelian Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Big Carnelian Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Big Carnelian 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 |
|---|---|---|---|
| JUN 23 | 19.7°C | 21.0°C | |
| JUN 24 | 20.3°C | 21.0°C | |
| JUN 25 | 20.3°C | 21.0°C | |
| JUN 26 | 20.4°C | 21.0°C | |
| JUN 27 | 21.0°C | 21.0°C | |
| JUN 28 | 21.8°C | 21.0°C | |
| JUN 29 | 20.8°C | 21.0°C | |
| JUN 30 | 20.9°C | 21.0°C | |
| JUL 1 | 23.5°C | 21.5°C | |
| JUL 2 | 23.5°C | 21.6°C | |
| JUL 3 | 23.5°C | 21.7°C | |
| JUL 4 | 23.5°C | 21.8°C | |
| JUL 5 | 23.5°C | 21.9°C | |
| JUL 6 | 23.5°C | 22.0°C | |
| JUL 7 | 23.5°C | 22.1°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 | 0°C | 1°C | 4°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 2°C | 5°C |
| April | 3°C | 8°C | 14°C |
| May | 9°C | 15°C | 21°C |
| June | 15°C | 21°C | 27°C |
| July | 20°C | 24°C | 27°C |
| August | 20°C | 24°C | 28°C |
| September | 18°C | 21°C | 23°C |
| October | 6°C | 13°C | 20°C |
| November | 2°C | 7°C | 11°C |
| December | 1°C | 3°C | 6°C |
Big Carnelian Lake: Water Temperature by Location
Big Carnelian Lake: Weather Forecast
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Location & Local Information
Big Carnelian Lake follows the seasonal thermal cycle typical of lakes in Minnesota. In winter the surface freezes and temperatures at the ice-water interface are around 32°F (0°C), while deeper water remains near the freshwater density maximum of about 39°F (4°C). After ice-out in spring, surface temperatures commonly climb from roughly 40–60°F (4–15°C) as the lake mixes and the sun strengthens. Summer brings the warmest conditions, with surface temperatures often reaching about 70–80°F (21–27°C) on sunny days, though wind, depth and shading can keep some nearshore spots cooler in the 60s °F (15–20°C). In autumn the lake cools back through the 50s into the 40s °F (10–5°C) before refreezing.
Swimming is generally allowed at Big Carnelian Lake during the ice-free months because water temperatures typically rise to comfortable levels and there is public shoreline access, but availability of formal beaches, lifeguards or facilities varies. Local water-quality advisories, algae blooms, aquatic vegetation or temporary restrictions can prohibit or discourage swimming, so checking current notices is important. Even when swimming is permitted, spring and late‑fall cold water can pose shock risks and winter ice makes open-water swimming unsafe without special training and equipment, so common-sense precautions and attention to posted guidance improve safety.