Mille Lacs Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Mille Lacs Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Mille Lacs Lake today is 21°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 4 | 24.2°C | 24.5°C | |
| AUG 5 | 24.1°C | 24.5°C | |
| AUG 6 | 24.0°C | 24.5°C | |
| AUG 7 | 24.3°C | 24.5°C | |
| AUG 8 | 23.6°C | 24.5°C | |
| AUG 9 | 23.6°C | 24.5°C | |
| AUG 10 | 23.6°C | 24.5°C | |
| AUG 11 | 21.0°C | 24.5°C | |
| AUG 12 | 24.5°C | 21.2°C | |
| AUG 13 | 24.5°C | 21.4°C | |
| AUG 14 | 24.5°C | 21.5°C | |
| AUG 15 | 24.5°C | 21.7°C | |
| AUG 16 | 24.5°C | 21.9°C | |
| AUG 17 | 24.5°C | 22.1°C | |
| AUG 18 | 24.5°C | 22.2°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 | 2°C | 6°C | 10°C |
| May | 7°C | 13°C | 19°C |
| June | 12°C | 20°C | 27°C |
| July | 18°C | 23°C | 27°C |
| August | 20°C | 25°C | 28°C |
| September | 17°C | 20°C | 23°C |
| October | 6°C | 13°C | 19°C |
| November | 3°C | 7°C | 11°C |
| December | 1°C | 3°C | 6°C |
Mille Lacs Lake: Water Temperature by Location
Mille Lacs Lake: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Mille Lacs Lake, one of Minnesota’s larger inland lakes, exhibits pronounced seasonal swings in surface temperature. In spring (April–May) waters commonly range from about 40–60°F (4–15°C) as the lake thaws, warming through early summer (May–June) to roughly 50–70°F (10–21°C). Midsummer surface temperatures in July and August typically sit in the upper 60s to mid‑70s°F (around 20–24°C), and in shallow bays can briefly reach the low 80s°F (about 27–28°C) on very warm, calm days. By early fall the surface cools through the 50s and 60s°F (10–18°C) and by late fall and winter it approaches freezing; the lake commonly ice‑covers in winter with water near 32°F (0°C) beneath the ice.
Swimming is permitted and commonly practiced during the warm months at public beaches, resorts and shorelines when surface temperatures are comfortable and no health or safety advisories are in effect. However, conditions can change rapidly: spring and early summer cold water temperatures raise the risk of cold‑water shock, wind and boat wakes can produce choppy conditions, and occasional water‑quality advisories (for algal blooms or bacterial concerns) may close areas to swimming. In winter the ice precludes normal swimming activities. Visitors are advised to check local conditions and posted notices before entering the water.