Grand Portage water temp
This data the coastal Grand Portage 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 Portage
Water temperature in Grand Portage today is 52.9°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Grand Portage was recorded in 2021 and was 56.8°F, and the coldest was recorded in 2012 at 45.7°F. Water temperature in Grand Portage is expected to drop to 48.7°F in the next 10 days. October average water temperature in Grand Portage is 51.6°F, the minimum temperature is 44.6°F, and the maximum is 63°F.
Throughout the year, the water temperature in Grand Portage does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Grand Portage in winter reaches 36.5°F, in spring 34.7°F, in summer the average temperature rises to 49.8°F, and in autumn it is 51.4°F.
Grand Portage water temperature now
| October 16, 2025 |
|---|
| today temp |
| 52.9°F |
| October 15, 2025 |
|---|
| yesterday temp |
| 53.2°F |
Surf Forecast in Grand Portage 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 Portage. 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 Portage. Data in table shown for October 16, 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 |
|---|---|---|---|
| 0' 2" | 0' 1" | 0' 0" | 0' 1" |
| 0.04 m | 0.02 m | 0.01 m | 0.03 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 0' 9" | 1' 3" | 1' 3" | 1' 7" |
| 0.22 m | 0.37 m | 0.39 m | 0.47 m |
Surf report in Grand Portage
Grand Portage weather forecast
Current temperature and weather
Data in a table show Grand Portage temperature today (October 16, 2025). For more information and forecast for a few days, go to the weather forecast Grand Portage.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  |  |  |
| 42.8°F | 43.5°F | 44.6°F | 47.1°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 |  | | |
| 50.7°F | 49.8°F | 48.6°F | 48.6°F |
You may also be interested in other sections of our site for Grand Portage: Sunrise and Sunset, Tides
Grand Portage water temperature by month
These figures shows the average, minimum and maximum monthly water temperature in Grand Portage. 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 Portage 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 | 36.3°F | 31.1°F | 40.1°F | cold |
| Water temperature in Grand Portage in January | ||||
| February | 33.4°F | 30.4°F | 36.7°F | cold |
| Water temperature in Grand Portage in February | ||||
| March | 33.3°F | 30.7°F | 37.4°F | cold |
| Water temperature in Grand Portage in March | ||||
| April | 34.3°F | 30.9°F | 38.1°F | cold |
| Water temperature in Grand Portage in April | ||||
| May | 36.5°F | 32.7°F | 41.2°F | cold |
| Water temperature in Grand Portage in May | ||||
| June | 39.6°F | 34.2°F | 49.1°F | cold |
| Water temperature in Grand Portage in June | ||||
| July | 50°F | 38.5°F | 66.6°F | cold |
| Water temperature in Grand Portage in July | ||||
| August | 59.7°F | 45.5°F | 67.5°F | cold |
| Water temperature in Grand Portage in August | ||||
| September | 58.1°F | 46°F | 65.7°F | cold |
| Water temperature in Grand Portage in September | ||||
| October | 51.6°F | 44.6°F | 63°F | cold |
| Water temperature in Grand Portage in October | ||||
| November | 44.4°F | 38.8°F | 52.5°F | cold |
| Water temperature in Grand Portage in November | ||||
| December | 39.6°F | 32.4°F | 44.4°F | cold |
| Water temperature in Grand Portage in December | ||||
Chart monthly average water temperature in Grand Portage
