Measurements:
°C
°F
CURRENT WEATHER
16:24
Duluth
72°F
NE 8 mph
Feels like: 72°F
Precip: 12%
World Resorts USA Duluth Weather

7 Day Weather Forecast

08.25
tue
DAY
70°F
NE 9 mph
precip
24%
NIGHT
66°F
NE 3 mph
precip
27%
08.26
wed
DAY
76°F
SE 9 mph
precip
4%
NIGHT
68°F
SE 6 mph
precip
7%
08.27
thu
DAY
72°F
SW 5 mph
precip
2%
NIGHT
60°F
SW 11 mph
precip
11%
08.28
fri
DAY
62°F
W 10 mph
precip
8%
NIGHT
58°F
SW 9 mph
precip
21%
08.29
sat
DAY
68°F
SW 9 mph
precip
30%
NIGHT
66°F
SW 12 mph
precip
44%
08.30
sun
DAY
78°F
SE 9 mph
precip
8%
NIGHT
58°F
SW 14 mph
precip
19%
08.31
mon
DAY
68°F
W 6 mph
precip
32%
NIGHT
64°F
SE 9 mph
precip
8%

Duluth Sea Water Temperature in August, °F

Select Year: 2026 2025 2024

The average sea surface temperature in August 2026 for Duluth was 18.3°F. The maximum and minimum values were 15.8°F and 20.8°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 67.5 °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