Lake Gratiot — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Gratiot, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Gratiot today is 16.5°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 | 18.5°C | 16.0°C | |
| SEP 15 | 17.9°C | 16.0°C | |
| SEP 16 | 17.7°C | 16.0°C | |
| SEP 17 | 17.5°C | 16.0°C | |
| SEP 18 | 17.4°C | 16.0°C | |
| SEP 19 | 17.6°C | 16.0°C | |
| SEP 20 | 16.6°C | 16.0°C | |
| SEP 21 | 16.5°C | 16.0°C | |
| SEP 22 | 16.0°C | 16.5°C | |
| SEP 23 | 16.0°C | 16.5°C | |
| SEP 24 | 16.0°C | 16.4°C | |
| SEP 25 | 16.0°C | 16.4°C | |
| SEP 26 | 16.0°C | 16.4°C | |
| SEP 27 | 16.0°C | 16.4°C | |
| SEP 28 | 16.0°C | 16.3°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 | 3°C |
| February | 0°C | 2°C | 3°C |
| March | 0°C | 2°C | 4°C |
| April | 0°C | 4°C | 8°C |
| May | 5°C | 11°C | 16°C |
| June | 10°C | 16°C | 21°C |
| July | 13°C | 20°C | 27°C |
| August | 17°C | 24°C | 30°C |
| September | 13°C | 16°C | 19°C |
| October | 9°C | 12°C | 14°C |
| November | 3°C | 7°C | 10°C |
| December | 0°C | 3°C | 6°C |
Lake Gratiot: Water Temperature by Location
Lake Gratiot: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Lake Gratiot, an inland lake in Michigan’s Upper Peninsula, tends to run cool for much of the year. Typical surface temperatures in spring (April–May) generally sit between about 36–55°F (2–13°C) as snowmelt and cool runoff dominate. In summer (June–August) the water warms most, commonly reaching roughly 60–72°F (16–22°C) on average and occasionally climbing into the mid‑70s (around 24°C) on very warm, calm days. By fall (September–November) temperatures drop back toward roughly 45–58°F (7–14°C), and in winter the lake usually approaches freezing with extensive ice cover, around 32°F (0°C) or slightly colder beneath the ice.
Swimming in Lake Gratiot is generally permitted since it is a natural, publicly accessible lake, but conditions mean the swimming season is relatively short and caution is advised. Cold water temperatures and sudden drop-offs increase the risk of cold shock and hypothermia, even on summer evenings, so swimming is safest during the warmest weeks and when accompanied by others; life jackets and supervision are recommended. Water quality and safety can vary, so checking local advisories or signage before entering is sensible, and ice activities should be avoided unless ice thickness and conditions have been verified by authorities.