Grand Marais (MI) water temp
This data the coastal Grand Marais water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current water temperature in Grand Marais
Water temperature in Grand Marais today is 61.9°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Grand Marais was recorded in 2021 and was 66.9°F, and the coldest was recorded in 2014 at 56.8°F. Water temperature in Grand Marais is expected to drop to 61°F in the next 10 days. September average water temperature in Grand Marais is 60.8°F, the minimum temperature is 48.9°F, and the maximum is 66.9°F.
Throughout the year, the water temperature in Grand Marais does not rise above 68°F and therefore is not suitable for comfortable swimming. But on some days of August, the water temperature warms up to 68°F and above. The average water temperature in Grand Marais in winter reaches 36.9°F, in spring 34.9°F, in summer the average temperature rises to 52.9°F, and in autumn it is 53.2°F.
Grand Marais water temperature now
| September 5, 2025 |
|---|
| today temp |
| 61.9°F |
| September 4, 2025 |
|---|
| yesterday temp |
| 63.3°F |
Surf Forecast in Grand Marais for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Grand Marais. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Grand Marais. Data in table shown for September 6, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 2' 8" | 2' 2" | 1' 10" | 1' 7" |
| 0.82 m | 0.67 m | 0.56 m | 0.48 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 3' 8" | 4' 1" | 4' 6" | 5' 8" |
| 1.11 m | 1.24 m | 1.37 m | 1.72 m |
Surf report in Grand Marais
Grand Marais weather forecast
Current temperature and weather
Data in a table show Grand Marais temperature today (September 6, 2025). For more information and forecast for a few days, go to the weather forecast Grand Marais.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | | |
| 54.1°F | 49.6°F | 52.9°F | 51.3°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | | |
| 51.8°F | 50.5°F | 50.7°F | 50.2°F |
You may also be interested in other sections of our site for Grand Marais: Sunrise and Sunset, Tides
Grand Marais water temperature by month
These figures shows the average, minimum and maximum monthly water temperature in Grand Marais. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Grand Marais on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 36.5°F | 31.3°F | 40.8°F | cold |
| Water temperature in Grand Marais in January | ||||
| February | 33.8°F | 30.9°F | 37.2°F | cold |
| Water temperature in Grand Marais in February | ||||
| March | 33.4°F | 31.1°F | 38.5°F | cold |
| Water temperature in Grand Marais in March | ||||
| April | 34.3°F | 30.2°F | 38.7°F | cold |
| Water temperature in Grand Marais in April | ||||
| May | 37°F | 32°F | 44.4°F | cold |
| Water temperature in Grand Marais in May | ||||
| June | 41.7°F | 35.1°F | 54.9°F | cold |
| Water temperature in Grand Marais in June | ||||
| July | 54°F | 39°F | 68.4°F | cold |
| Water temperature in Grand Marais in July | ||||
| August | 63°F | 45.1°F | 71.1°F | cold |
| Water temperature in Grand Marais in August | ||||
| September | 60.8°F | 48.9°F | 66.9°F | cold |
| Water temperature in Grand Marais in September | ||||
| October | 53.2°F | 44.6°F | 62.8°F | cold |
| Water temperature in Grand Marais in October | ||||
| November | 45.9°F | 39.4°F | 54.3°F | cold |
| Water temperature in Grand Marais in November | ||||
| December | 40.3°F | 34.9°F | 45.1°F | cold |
| Water temperature in Grand Marais in December | ||||
Chart monthly average water temperature in Grand Marais
