S
M
T
W
T
F
S
30
64°
62°
31
71°
62°
1
85°
63°
2
76°
62°
3
66°
62°
4
64°
62°
5
64°
61°
6
68°
61°
7
68°
62°
8
78°
65°
9
75°
57°
10
79°
53°
11
86°
61°
12
71°
51°
13
66°
47°
14
64°
35°
15
68°
45°
16
62°
45°
17
73°
49°
18
60°
56°
19
60°
53°
20
62°
54°
21
59°
48°
22
58°
43°
23
58°
37°
24
65°
49°
25
62°
54°
26
62°
55°
27
74°
53°
28
64°
49°
29
64°
56°
30
79°
60°
1
66°
47°
2
62°
37°
3
61°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Duluth
Duluth's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Duluth. See also: October | November | December.
