Knife River water temp

This data the coastal Knife River 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 Knife River

Water temperature in Knife River today is 60.1°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Knife River was recorded in 2023 and was 67.1°F, and the coldest was recorded in 2019 at 48.9°F. Water temperature in Knife River is expected to be constant 60.1°F in the next 10 days. September average water temperature in Knife River is 59.9°F, the minimum temperature is 47.5°F, and the maximum is 67.1°F.

Throughout the year, the water temperature in Knife River does not rise above 68°F and therefore is not suitable for comfortable swimming. But on some days of July, August, the water temperature warms up to 68°F and above. The average water temperature in Knife River in winter reaches 35.8°F, in spring 35.4°F, in summer the average temperature rises to 56.5°F, and in autumn it is 52°F.

Knife River water temperature now

Surf Forecast in Knife River 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 Knife River. 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 Knife River. 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)

Surf report in Knife River

Knife River weather forecast

Current temperature and weather

Data in a table show Knife River temperature today (September 6, 2025). For more information and forecast for a few days, go to the weather forecast Knife River.

0-3 h	3-6 h	6-9 h	9-12 h
45.1°F	45.1°F	45.9°F	47.3°F

12-15 h	15-18 h	18-21 h	21-24 h
49.3°F	51.4°F	52.5°F	51.8°F

Knife River water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Knife River. 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 Knife River 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

Chart monthly average water temperature in Knife River

The nearest beaches and cities from Knife River with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
French River	59.5°F	55.4°F		1' 5"
Port Wing	63.1°F	53.6°F		1' 10"
Herbster	63.3°F	53.6°F		2' 2"
Beaver Bay	61.3°F	51.8°F		1' 7"
Ashland	66°F	55.4°F		1' 5"
Apostle Islands	63.7°F	53.6°F		2' 8"
Schroeder	61.3°F	46.4°F		1' 8"
Lutsen	61.5°F	51.8°F		1' 6"
Grand Marais	61.2°F	51.8°F		1' 11"
Ontonagon	62.8°F	51.8°F		3' 4"

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Knife River Beach

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Our report for Knife River is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.