Keweenaw Bay water temp
This data the coastal Keweenaw Bay 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 Keweenaw Bay
Water temperature in Keweenaw Bay today is 62.1°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Keweenaw Bay was recorded in 2024 and was 65.8°F, and the coldest was recorded in 2014 at 54.3°F. Water temperature in Keweenaw Bay is expected to drop to 60.1°F in the next 10 days. September average water temperature in Keweenaw Bay is 61.9°F, the minimum temperature is 52.2°F, and the maximum is 69.3°F.
The swimming season in Keweenaw Bay lasts only one month - August. During this month, Keweenaw Bay water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Keweenaw Bay in winter reaches 36°F, in spring 35.1°F, in summer the average temperature rises to 58.6°F, and in autumn it is 53.8°F.
Keweenaw Bay water temperature now
| September 17, 2025 |
|---|
| today temp |
| 62.1°F |
| September 16, 2025 |
|---|
| yesterday temp |
| 58.1°F |
Surf Forecast in Keweenaw Bay 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 Keweenaw Bay. 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 Keweenaw Bay. Data in table shown for September 17, 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' 5" | 0' 11" | 0' 7" | 0' 5" |
| 0.12 m | 0.27 m | 0.17 m | 0.12 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 0' 6" | 0' 3" | 0' 2" | 0' 1" |
| 0.16 m | 0.08 m | 0.04 m | 0.03 m |
Surf report in Keweenaw Bay
Keweenaw Bay weather forecast
Current temperature and weather
Data in a table show Keweenaw Bay temperature today (September 17, 2025). For more information and forecast for a few days, go to the weather forecast Keweenaw Bay.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 73.6°F | 72°F | 70.3°F | 70°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | |  |
| 75.2°F | 75.6°F | 70.3°F | 63.3°F |
You may also be interested in other sections of our site for Keweenaw Bay: Sunrise and Sunset, Tides
Keweenaw Bay water temperature by month
These figures shows the average, minimum and maximum monthly water temperature in Keweenaw Bay. 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 Keweenaw Bay 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 | 35.2°F | 30.6°F | 40.6°F | cold |
| Water temperature in Keweenaw Bay in January | ||||
| February | 32.9°F | 30.2°F | 35.8°F | cold |
| Water temperature in Keweenaw Bay in February | ||||
| March | 32.9°F | 30.4°F | 36.1°F | cold |
| Water temperature in Keweenaw Bay in March | ||||
| April | 34.2°F | 31.1°F | 40.3°F | cold |
| Water temperature in Keweenaw Bay in April | ||||
| May | 38.3°F | 33.4°F | 45.5°F | cold |
| Water temperature in Keweenaw Bay in May | ||||
| June | 48.7°F | 37.9°F | 61.7°F | cold |
| Water temperature in Keweenaw Bay in June | ||||
| July | 61.7°F | 46.2°F | 71.6°F | cold |
| Water temperature in Keweenaw Bay in July | ||||
| August | 65.3°F | 55.8°F | 70.9°F | cold |
| Water temperature in Keweenaw Bay in August | ||||
| September | 61.9°F | 52.2°F | 69.3°F | cold |
| Water temperature in Keweenaw Bay in September | ||||
| October | 53.6°F | 44.6°F | 64.9°F | cold |
| Water temperature in Keweenaw Bay in October | ||||
| November | 45.9°F | 39.6°F | 55.6°F | cold |
| Water temperature in Keweenaw Bay in November | ||||
| December | 39.7°F | 33.4°F | 44.6°F | cold |
| Water temperature in Keweenaw Bay in December | ||||
Chart monthly average water temperature in Keweenaw Bay
