19.09
sat
sat
Day
57°F
SW 14 mph
Precip.
26%
26%
Night
54°F
SW 8 mph
Precip.
17%
17%
20.09
sun
sun
Day
55°F
SW 22 mph
Precip.
29%
29%
Night
50°F
W 15 mph
Precip.
20%
20%
21.09
mon
mon
Day
55°F
SW 17 mph
Precip.
9%
9%
Night
50°F
W 14 mph
Precip.
12%
12%
22.09
tue
tue
Day
55°F
SW 12 mph
Precip.
2%
2%
Night
50°F
W 6 mph
Precip.
11%
11%
23.09
wed
wed
Day
54°F
SW 6 mph
Precip.
5%
5%
Night
52°F
SW 6 mph
Precip.
11%
11%
24.09
thu
thu
Day
57°F
W 2 mph
Precip.
4%
4%
Night
54°F
SW 2 mph
Precip.
11%
11%
25.09
fri
fri
Day
61°F
NW 2 mph
Precip.
4%
4%
Night
55°F
SW 4 mph
Precip.
13%
13%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 64.2°F. The highest and lowest sea temperatures during the month were 67.8°F and 60.4°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 56.9°F. The highest and lowest sea temperatures during the month were 62.4°F and 50.0°F.
Air temperature in Duluth, °F
Precipitation total in Duluth, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Duluth
Duluth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Duluth
Local time: 04:16
September 19, saturday
0600
54°F
SW
11 mph
11 mph
0900
55°F
SW
11 mph
11 mph
1200
57°F
SW
14 mph
14 mph
1500
57°F
SW
15 mph
15 mph
1800
57°F
SW
13 mph
13 mph
2100
55°F
SW
8 mph
8 mph
September 20, sunday
0000
54°F
SW
8 mph
8 mph
0300
54°F
SW
8 mph
8 mph
