S
M
T
W
T
F
S
30
72°
52°
31
69°
52°
1
69°
54°
2
70°
52°
3
68°
51°
4
67°
58°
5
69°
59°
6
70°
52°
7
72°
50°
8
66°
49°
9
64°
49°
10
66°
52°
11
66°
50°
12
63°
53°
13
71°
53°
14
Hist. Avg.
68°
51°
15
Hist. Avg.
67°
50°
16
Hist. Avg.
67°
50°
17
Hist. Avg.
66°
50°
18
Hist. Avg.
66°
49°
19
Hist. Avg.
66°
49°
20
Hist. Avg.
65°
49°
21
Hist. Avg.
65°
48°
22
Hist. Avg.
64°
48°
23
Hist. Avg.
64°
48°
24
Hist. Avg.
63°
47°
25
Hist. Avg.
63°
47°
26
Hist. Avg.
62°
46°
27
Hist. Avg.
62°
46°
28
Hist. Avg.
62°
46°
29
Hist. Avg.
61°
45°
30
Hist. Avg.
61°
45°
1
Hist. Avg.
60°
44°
2
Hist. Avg.
60°
44°
3
Hist. Avg.
59°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Duluth
Duluth's September 2026 forecast shows daily high temperatures ranging from 63° to 72°, with overnight lows between 49° and 59°. The average high for September is 68° with an average low of 52°. 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.
