Green Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Green Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Green Lake today is 17.7°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 | 20.5°C | 20.8°C | |
| SEP 15 | 19.7°C | 20.8°C | |
| SEP 16 | 19.6°C | 20.8°C | |
| SEP 17 | 18.6°C | 20.8°C | |
| SEP 18 | 17.5°C | 20.8°C | |
| SEP 19 | 17.8°C | 20.8°C | |
| SEP 20 | 17.9°C | 20.8°C | |
| SEP 21 | 17.7°C | 20.8°C | |
| SEP 22 | 20.8°C | 17.9°C | |
| SEP 23 | 20.8°C | 18.0°C | |
| SEP 24 | 20.8°C | 18.2°C | |
| SEP 25 | 20.8°C | 18.3°C | |
| SEP 26 | 20.8°C | 18.5°C | |
| SEP 27 | 20.8°C | 18.6°C | |
| SEP 28 | 20.8°C | 18.8°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 | 3°C | 8°C | 12°C |
| February | 3°C | 9°C | 15°C |
| March | 1°C | 9°C | 17°C |
| April | 3°C | 12°C | 20°C |
| May | 7°C | 15°C | 23°C |
| June | 15°C | 19°C | 23°C |
| July | 17°C | 23°C | 29°C |
| August | 20°C | 24°C | 28°C |
| September | 18°C | 21°C | 24°C |
| October | 5°C | 12°C | 19°C |
| November | 4°C | 8°C | 11°C |
| December | 2°C | 7°C | 11°C |
Green Lake: Water Temperature by Location
Green Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Green Lake in Minnesota typically follows the seasonal pattern of Midwestern lakes, with water temperatures that change markedly through the year. After ice-out in spring, surface temperatures commonly range from roughly 40–60°F (4–16°C) as the lake mixes and warms. By early to mid-summer the surface usually warms to about 60–75°F (16–24°C), and at peak summer days it often reaches the low 70s to around 80°F (21–27°C) in shallow, sun-exposed areas. As autumn arrives the temperature drops back toward the 50–60°F (10–16°C) range, and in winter the lake is generally at or near freezing under ice, around 32–34°F (0–1°C).
Swimming is generally allowed during the warm months when public beaches and access points are open and posted advisories are absent; the higher summer temperatures make recreational swimming comfortable. Local authorities may close beaches or discourage swimming when water-quality problems occur, such as harmful blue-green algae blooms or elevated bacterial counts, and cold spring or fall water can pose a risk of cold shock even if not icy. In winter the frozen surface prevents normal swimming and any ice activities should only occur with proper safety checks and official guidance.