Measurements:
°C
°F
CURRENT WEATHER
09:27
Duluth
58°F
E 21 mph
Feels like: 52°F
Precip: 10%
World Resorts USA Duluth Weather

7 Day Weather Forecast

09.15
tue
DAY
62°F
E 17 mph
precip
3%
NIGHT
54°F
SE 6 mph
precip
9%
09.16
wed
DAY
54°F
W 6 mph
precip
18%
NIGHT
54°F
SW 9 mph
precip
34%
09.17
thu
DAY
62°F
W 2 mph
precip
15%
NIGHT
58°F
SW 11 mph
precip
20%
09.18
fri
DAY
56°F
W 12 mph
precip
57%
NIGHT
52°F
W 14 mph
precip
27%
09.19
sat
DAY
56°F
SW 17 mph
precip
28%
NIGHT
52°F
SW 9 mph
precip
29%
09.20
sun
DAY
58°F
SW 17 mph
precip
19%
NIGHT
54°F
SW 17 mph
precip
27%
09.21
mon
DAY
56°F
SW 19 mph
precip
39%
NIGHT
52°F
SW 21 mph
precip
65%

Duluth Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Duluth was 18.4°F. The maximum and minimum values were 16.9°F and 19.9°F respectively.

Duluth on the Weather Map

Best Time to Visit Duluth
The most sunny months:
August 14 days
September 14 days
July 13 days
The most warm months:
July 77.5 °F
August 75.8 °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