Thunder Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Thunder Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Thunder Lake today is 17.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 |
|---|---|---|---|
| SEP 14 | 18.7°C | 19.5°C | |
| SEP 15 | 17.8°C | 19.5°C | |
| SEP 16 | 17.7°C | 19.5°C | |
| SEP 17 | 17.0°C | 19.5°C | |
| SEP 18 | 17.4°C | 19.5°C | |
| SEP 19 | 17.5°C | 19.5°C | |
| SEP 20 | 17.0°C | 19.5°C | |
| SEP 21 | 17.4°C | 19.5°C | |
| SEP 22 | 19.5°C | 17.5°C | |
| SEP 23 | 19.5°C | 17.6°C | |
| SEP 24 | 19.5°C | 17.7°C | |
| SEP 25 | 19.5°C | 17.8°C | |
| SEP 26 | 19.5°C | 17.9°C | |
| SEP 27 | 19.5°C | 18.0°C | |
| SEP 28 | 19.5°C | 18.1°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 | 4°C |
| April | 1°C | 6°C | 10°C |
| May | 6°C | 13°C | 19°C |
| June | 15°C | 21°C | 27°C |
| July | 19°C | 23°C | 27°C |
| August | 21°C | 25°C | 28°C |
| September | 16°C | 20°C | 23°C |
| October | 6°C | 12°C | 18°C |
| November | 3°C | 7°C | 11°C |
| December | 1°C | 4°C | 7°C |
Thunder Lake: Water Temperature by Location
Thunder Lake: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Lake of Thunder Lake in Minnesota experiences the same seasonal swing in water temperature typical of small inland lakes in the region. During winter months the lake is usually at or just above freezing under ice cover, around 32°F (0°C). As ice breaks up in spring, surface temperatures commonly range from the mid-30s to mid-50s°F (2–13°C) depending on air temperatures and runoff. In summer the surface warms substantially, with typical highs in the mid-60s to upper-70s°F (18–26°C) and occasional warm spells pushing parts of the lake into the low 80s°F (27–28°C) on calm, sunny days; deeper water remains cooler. By fall the surface cools again into the 40s–60s°F (5–15°C) as the lake destratifies and prepares for freeze-up.
Swimming is generally possible at Lake of Thunder Lake where public access or private shoreline allows it, but local ordinances, posted advisories, water quality or harmful algal blooms can restrict bathing at times. Much of the year, especially early spring and late fall, water temperatures are cold enough to cause discomfort or increased risk of cold-water shock, so swimmers typically prefer midsummer when surface temperatures exceed about 70°F (21°C). Visitors should check current water-quality reports, heed posted signs, and practice usual lake safety measures such as swimming with others and monitoring sudden weather changes.