Lake Superior — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Superior, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Superior today is 18.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 | 20.0°C | 17.5°C | |
| AUG 25 | 19.9°C | 17.5°C | |
| AUG 26 | 19.7°C | 17.5°C | |
| AUG 27 | 18.8°C | 17.5°C | |
| AUG 28 | 18.9°C | 17.5°C | |
| AUG 29 | 19.0°C | 17.5°C | |
| AUG 30 | 18.8°C | 17.5°C | |
| AUG 31 | 18.3°C | 17.5°C | |
| SEP 1 | 15.0°C | 18.1°C | |
| SEP 2 | 15.0°C | 18.0°C | |
| SEP 3 | 15.0°C | 17.8°C | |
| SEP 4 | 15.0°C | 17.6°C | |
| SEP 5 | 15.0°C | 17.5°C | |
| SEP 6 | 15.0°C | 17.3°C | |
| SEP 7 | 15.0°C | 17.1°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 | 2°C | 4°C |
| February | -1°C | 1°C | 4°C |
| March | -1°C | 1°C | 4°C |
| April | 0°C | 3°C | 7°C |
| May | 2°C | 8°C | 13°C |
| June | 5°C | 11°C | 18°C |
| July | 12°C | 18°C | 24°C |
| August | 14°C | 18°C | 21°C |
| September | 11°C | 15°C | 19°C |
| October | 6°C | 12°C | 18°C |
| November | 3°C | 8°C | 12°C |
| December | 0°C | 3°C | 7°C |
Lake Superior: Water Temperature by Location
Lake Superior: Weather Forecast
September 1
September 2
September 3
September 4
September 5
Location & Local Information
Max. length 350 mi (560 km)
Max. width 160 mi (260 km)
Surface area 82,100 km2 (31,700 sq mi)
Average depth 483 ft (147 m)
Max. depth 1,333 ft (406 m)
Lake Superior, the largest and coldest of the Great Lakes, is a breathtaking freshwater expanse surrounded by rugged cliffs, dense forests, and picturesque shorelines. Its sheer size and depth mean that it holds a vast amount of cold water, which heavily influences its temperature and swimming conditions. While it offers incredible natural beauty and opportunities for outdoor activities, swimming in Lake Superior is an experience defined by its cool, invigorating waters.
Water temperatures in Lake Superior remain chilly for much of the year due to its depth and northern location. During the peak summer months, shallow coastal areas can warm to 60°F to 65°F (15°C to 18°C), but deeper sections of the lake often stay below 50°F (10°C), even in July and August. The cold water can be refreshing on a hot day, but it also limits how long most people are comfortable swimming. Wetsuits are common among swimmers venturing further from shore or engaging in longer water activities.
Swimming is possible at several beaches along the lake’s shoreline, including spots like Minnesota’s Park Point Beach or Michigan’s Little Presque Isle. The water is exceptionally clear, adding to its allure, but swimmers should always be cautious of hypothermia risks and sudden changes in weather. Lake Superior’s pristine, wild beauty and crisp waters make it a unique destination for those seeking an invigorating swim in a truly majestic setting.