Lake Johanna — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Johanna, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Johanna today is 25°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 | 24.5°C | 24.3°C | |
| AUG 25 | 24.4°C | 24.3°C | |
| AUG 26 | 24.4°C | 24.3°C | |
| AUG 27 | 25.0°C | 24.3°C | |
| AUG 28 | 25.4°C | 24.3°C | |
| AUG 29 | 25.5°C | 24.3°C | |
| AUG 30 | 25.5°C | 24.3°C | |
| AUG 31 | 25.5°C | 24.3°C | |
| SEP 1 | 20.6°C | 24.8°C | |
| SEP 2 | 20.6°C | 24.6°C | |
| SEP 3 | 20.6°C | 24.3°C | |
| SEP 4 | 20.6°C | 24.1°C | |
| SEP 5 | 20.6°C | 23.9°C | |
| SEP 6 | 20.6°C | 23.7°C | |
| SEP 7 | 20.6°C | 23.5°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 | 3°C | 5°C |
| February | 0°C | 3°C | 5°C |
| March | 0°C | 3°C | 5°C |
| April | 4°C | 9°C | 15°C |
| May | 10°C | 16°C | 22°C |
| June | 16°C | 22°C | 27°C |
| July | 22°C | 25°C | 29°C |
| August | 20°C | 24°C | 29°C |
| September | 18°C | 21°C | 23°C |
| October | 6°C | 13°C | 19°C |
| November | 3°C | 8°C | 12°C |
| December | 1°C | 3°C | 6°C |
Lake Johanna: Water Temperature by Location
Lake Johanna: Weather Forecast
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Location & Local Information
Lake Johanna in Minnesota shows pronounced seasonal shifts in water temperature. In winter the surface typically sits at or just above freezing, around 32°F (0°C), and ice cover is common. During spring the water warms from the mid‑30s into the 40s and 50s °F (about 2–13°C) as ice melts and air temperatures rise. Summer surface temperatures often reach the mid‑60s to upper‑70s °F (roughly 18–26°C) on warm days and can sometimes approach 80°F (27°C) during heat spells. In autumn the lake cools back into the 40s–60s °F band (about 4–16°C) before refreezing. Deeper water, where present, tends to remain cooler than the surface through the warmer months.
Swimming is generally allowed at appropriate, designated spots around Lake Johanna when local parks or beaches are open, but permissibility depends on municipal rules, posted signs and current water‑quality conditions. Winter swimming is unsafe due to ice and hypothermia risk, and spring and fall temperatures may be uncomfortably cold for many swimmers. In summer the warmer surface temperatures make bathing attractive, but occasional advisories for algal blooms or bacteria can close swimming areas temporarily. For safety and comfort, follow local guidance, heed posted advisories, and consider water temperature—waters below about 70°F (21°C) can feel chilly even on warm days.