Duluth Water Temperature

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Duluth is a city close to Lake Superior. August is the month with the warmest water temperature at 73°F / 22.8°C. The coolest month is January with an avg. water temperature of 32°F / -0°C. April is the sunniest at 0in / 1.1mm and August the wettest month with 2.1in / 53.3mm. The average air temperature is around 69.4°F / 20.8°C, July is the hottest month in a year. January is the coolest with 12.4°F / -10.9°C average air temperature. Warm-summer humid continental climate would be the climate here. June, July, August, September would be the best time to visit.

Duluth Summary

Description Value
Current water temperature /
Warmest Month Water Temperature: August with 73°F / 22.8°C
Coldest Month Water Temperature: January with 32°F / -0°C
Warmest Month Air Temperature: July with 69.4°F / 20.8°C
Coldest Month Air Temperature: January with 12.4°F / -10.9°C
Wettest Month: August with 2.1in / 53.3mm
Driest Month: April with 0in / 1.1mm
Highest Humidity December with 78.1%
Lowest Humidity September with 70.4%
Best Time to Visit: June, July, August, September
Climate Classification Warm-summer humid continental climate

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Duluth water temperature by month

Lake Superior water temperature by month

Max. Water

Temperature (°F)

ø. Water

Temperature (°F)

Min. Water

Temperature (°F)

January

32 32 32

February

32 32 32

March

32 32 32

April

32.5 32 32

May

42.8 36.5 32.5

June

61.7 51.6 43

July

74.1 67.5 59.4

August

74.8 70.5 66.9

September

71.2 63.7 57

October

58.3 50.9 46

November

45.9 42.4 39

December

38.7 34.3 32

Lake Superior water temperature by month

Max. Water

Temperature (°C)

ø. Water

Temperature (°C)

Min. Water

Temperature (°C)

January

0 -0 -0

February

0 -0 -0

March

0 -0 -0

April

0.3 0 -0

May

6 2.5 0.3

June

16.5 10.9 6.1

July

23.4 19.7 15.2

August

23.8 21.4 19.4

September

21.8 17.6 13.9

October

14.6 10.5 7.8

November

7.7 5.8 3.9

December

3.7 1.3 -0
The highest water temperature will be reached in August with around 73°F / 22.8°C. The lowest in January with an average water temperature of 32°F / -0°C.

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Duluth weather today & 14-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Jul. 06
Few clouds
64 °F
56°F
18 °C
13°C
3mph (4km/h)
northeast
0in (0mm)
0 %
63%
Jul. 07
Light shower rain
68 °F
53°F
20 °C
12°C
1mph (2km/h)
east-northeast
0in (2mm)
55 %
64%
Jul. 08
Thunderstorm with rain
68 °F
56°F
20 °C
13°C
1mph (2km/h)
northeast
0in (8mm)
70 %
79%
Jul. 09
Broken clouds
67 °F
55°F
20 °C
13°C
1mph (2km/h)
east-northeast
0in (0mm)
0 %
74%
Jul. 10
Broken clouds
67 °F
56°F
19 °C
13°C
2mph (3km/h)
east
0in (0mm)
15 %
78%
Jul. 11
Light rain
67 °F
59°F
20 °C
15°C
2mph (3km/h)
east-southeast
0in (8mm)
80 %
84%
Jul. 12
Overcast clouds
75 °F
60°F
24 °C
16°C
2mph (4km/h)
west
0in (0mm)
0 %
74%
Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Jul. 13
Broken clouds
75 °F
60°F
24 °C
16°C
2mph (4km/h)
west-southwest
0in (0mm)
0 %
76%
Jul. 14
Scattered clouds
77 °F
61°F
25 °C
16°C
2mph (4km/h)
west-southwest
0in (0mm)
0 %
69%
Jul. 15
Broken clouds
77 °F
61°F
25 °C
16°C
2mph (4km/h)
west-southwest
0in (0mm)
0 %
72%
Jul. 16
Few clouds
77 °F
63°F
25 °C
17°C
2mph (4km/h)
west
0in (0mm)
0 %
67%
Jul. 17
Few clouds
77 °F
49°F
25 °C
9°C
1mph (2km/h)
southwest
0in (0mm)
0 %
74%
Jul. 18
Few clouds
76 °F
54°F
24 °C
12°C
1mph (1km/h)
south-southeast
0in (0mm)
0 %
73%
Jul. 19
Broken clouds
84 °F
59°F
29 °C
15°C
2mph (3km/h)
south-southeast
0in (0mm)
20 %
82%
Jul. 20
Few clouds
88 °F
65°F
31 °C
19°C
2mph (4km/h)
south-southwest
0in (0mm)
0 %
79%
Jul. 21
Scattered clouds
86 °F
65°F
30 °C
19°C
1mph (2km/h)
southwest
0in (0mm)
0 %
85%

Duluth weather by month / climate table

Max.

Temperature

°F

ø.

Temperature

°F

Min.

Temperature

(°F)

Precip.

(in)

Rainy Days

(d)

Rel. Humidity

(%)

January

23.2 12.4 2.1 0.6 0 75.2%

February

25.7 14.4 4.3 0.5 0 74%

March

41.4 25.7 9.9 0.3 0 74.2%

April

50 36.5 25.5 0 0 71.1%

May

64.6 48.6 37.8 0.9 1 71.1%

June

72.9 60.1 47.3 1.1 2 76.2%

July

78.1 69.4 61.2 1.7 1 72.8%

August

78.1 68.7 61.5 2.1 0 71.9%

September

75.6 61.7 49.1 1.1 0 70.4%

October

60.1 47.8 37.6 0.8 0 70.6%

November

46.2 35.1 23.5 0.8 1 72.5%

December

30.4 20.8 13.5 1.5 0 78.1%

Max.

Temperature

°C

ø.

Temperature

°C

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(d)

Rel. Humidity

(%)

January

-4.9 -10.9 -16.6 15.5 0 75.2%

February

-3.5 -9.8 -15.4 13.8 0 74%

March

5.2 -3.5 -12.3 6.6 0 74.2%

April

10 2.5 -3.6 1.1 0 71.1%

May

18.1 9.2 3.2 23.2 1 71.1%

June

22.7 15.6 8.5 28 2 76.2%

July

25.6 20.8 16.2 43.4 1 72.8%

August

25.6 20.4 16.4 53.3 0 71.9%

September

24.2 16.5 9.5 28.7 0 70.4%

October

15.6 8.8 3.1 19.8 0 70.6%

November

7.9 1.7 -4.7 19.4 1 72.5%

December

-0.9 -6.2 -10.3 37.5 0 78.1%
April is the most draught at 0in / 1.1mm and August the month with the most rain around 2.1in / 53.3mm. The avg. temperature is around 69.4°F / 20.8°C, July is the hottest month in a year. January is the coolest with 12.4°F / -10.9°C avg. temperature.

Activities & POI in Duluth

Type of Activity List
Marina for Sailing, Boat adventures, fishing Minnesota Slip
Attraction Marshall W Alworth Planetariam, SS William A. Irvin, Enger Tower, Glenshhen Mansion Congdon Estate Grounds
Golf Course Enger Park Golf Course, Ridgeview Country Club