Duluth water temp

This data the coastal Duluth 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 Duluth

Water temperature in Duluth today is 61.2°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Duluth was recorded in 2024 and was 65.7°F, and the coldest was recorded in 2012 at 53.1°F. Water temperature in Duluth is expected to drop to 56.1°F in the next 10 days. September average water temperature in Duluth is 61.3°F, the minimum temperature is 51.4°F, and the maximum is 70.3°F.

Throughout the year, the water temperature in Duluth does not rise above 68°F and therefore is not suitable for comfortable swimming. But on some days of July, August, September, the water temperature warms up to 68°F and above. The average water temperature in Duluth in winter reaches 34.7°F, in spring 37.2°F, in summer the average temperature rises to 60.8°F, and in autumn it is 52.5°F.

Duluth water temperature now

Surf Forecast in Duluth 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 Duluth. 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 Duluth. Data in table shown for September 26, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Duluth

Duluth weather forecast

Current temperature and weather

Data in a table show Duluth temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast Duluth.

0-3 h	3-6 h	6-9 h	9-12 h
61.3°F	59.7°F	59°F	58.5°F

12-15 h	15-18 h	18-21 h	21-24 h
61.5°F	66.7°F	62.6°F	54.1°F

Duluth water temperature by month

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

The nearest beaches and cities from Duluth 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
Park Point	61.2°F	66.2°F		0' 11"
French River	59.7°F	66.2°F		0' 11"
Knife River	59.2°F	60.8°F		0' 10"
Two Harbors	58.1°F	60.8°F		1' 0"
Port Wing	59°F	66.2°F		0' 11"
Herbster	59.2°F	64.4°F		1' 0"
Cornucopia	58.8°F	64.4°F		1' 0"
Beaver Bay	58.1°F	59°F		0' 10"
Ashland	65.5°F	62.6°F		1' 0"
Silver Bay	58.3°F	59°F		0' 10"

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Our report for Duluth 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.