Measurements:
°C
°F
CURRENT WEATHER
14:10
Duluth
82°F
NE 7 mph
Feels like: 80°F
Precip: 0%
World Resorts USA Duluth Weather

7 Day Weather Forecast

08.05
wed
DAY
76°F
NE 6 mph
precip
1%
NIGHT
62°F
NE 6 mph
precip
4%
08.06
thu
DAY
86°F
NE 13 mph
precip
1%
NIGHT
62°F
NE 4 mph
precip
19%
08.07
fri
DAY
80°F
E 5 mph
precip
4%
NIGHT
60°F
SE 3 mph
precip
5%
08.08
sat
DAY
78°F
NW 4 mph
precip
4%
NIGHT
58°F
S 6 mph
precip
14%
08.09
sun
DAY
78°F
S 4 mph
precip
1%
NIGHT
58°F
S 5 mph
precip
4%
08.10
mon
DAY
74°F
S 4 mph
precip
1%
NIGHT
60°F
NE 4 mph
precip
7%
08.11
tue
DAY
74°F
SE 4 mph
precip
9%
NIGHT
58°F
N 2 mph
precip
5%

Duluth Sea Water Temperature in August, °F

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Duluth was 19.7°F. The maximum and minimum values were 17.0°F and 21.7°F respectively.

Duluth on the Weather Map

Best Time to Visit Duluth
The most sunny months:
September 14 days
July 13 days
August 13 days
The most warm months:
July 77.5 °F
August 76.5 °F
June 69.8 °F
Warmest sea temperature:
August 67.6 °F
July 65.5 °F
September 63.7 °F
The most cold months:
January 14.4 °F
February 16.7 °F
December 21.4 °F
The most rainy months:
August 3 days
July 3 days
June 2 days
The most windy months:
April 9 mph
March 8 mph
November 8 mph
more details