Big Marine Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Big Marine Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Big Marine Lake today is 13.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| OCT 5 | 16.0°C | 12.5°C | |
| OCT 6 | 15.8°C | 12.5°C | |
| OCT 7 | 13.9°C | 12.5°C | |
| OCT 8 | 15.0°C | 12.5°C | |
| OCT 9 | 15.0°C | 12.5°C | |
| OCT 10 | 14.4°C | 12.5°C | |
| OCT 11 | 13.5°C | 12.5°C | |
| OCT 12 | 13.1°C | 12.5°C | |
| OCT 13 | 12.5°C | 13.8°C | |
| OCT 14 | 12.5°C | 13.8°C | |
| OCT 15 | 12.5°C | 13.7°C | |
| OCT 16 | 12.5°C | 13.6°C | |
| OCT 17 | 12.5°C | 13.6°C | |
| OCT 18 | 12.5°C | 13.5°C | |
| OCT 19 | 12.5°C | 13.4°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 | 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 | 16°C | 22°C | 27°C |
| July | 21°C | 25°C | 27°C |
| August | 20°C | 25°C | 30°C |
| September | 18°C | 21°C | 25°C |
| October | 6°C | 13°C | 19°C |
| November | 2°C | 7°C | 12°C |
| December | 1°C | 3°C | 6°C |
Big Marine Lake: Water Temperature by Location
Big Marine Lake: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Big Marine Lake follows the seasonal temperature patterns typical of east‑central Minnesota. In spring the surface usually warms from roughly 40–60°F (4–16°C) as ice melts and the lake mixes. During summer the surface commonly reaches the high 60s to mid‑70s °F (about 20–24°C) and can climb into the upper 70s or low 80s °F (around 25–28°C) during heat spells, making conditions most comfortable for swimming. By fall temperatures fall back into the 50s–60s °F (10–16°C) as the lake cools and begins to stratify, and in winter the surface freezes at or near 32°F (0°C) while deeper water stabilizes closer to 39°F (4°C) beneath the ice.
Swimming is permitted during the ice‑free months and is a common recreational activity when surface temperatures are warm enough to be comfortable and safe. Recreational use is generally allowed because the lake functions as a local public waterbody and reaches summer temperatures suitable for bathing, but users should heed posted advisories and use standard precautions: avoid swimming in very cold water because of hypothermia risk, follow any local water‑quality or harmful algal bloom notices, and never swim on or under ice during winter when conditions are hazardous.