S
M
T
W
T
F
S
30
82°
65°
31
85°
59°
1
78°
51°
2
81°
63°
3
87°
62°
4
87°
67°
5
90°
66°
6
87°
65°
7
83°
68°
8
80°
63°
9
76°
58°
10
73°
57°
11
76°
57°
12
73°
53°
13
70°
53°
14
71°
54°
15
73°
50°
16
76°
56°
17
77°
58°
18
78°
56°
19
76°
54°
20
67°
52°
21
69°
54°
22
70°
53°
23
75°
56°
24
76°
54°
25
71°
49°
26
62°
46°
27
65°
42°
28
60°
49°
29
72°
44°
30
59°
47°
1
68°
49°
2
58°
46°
3
59°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sisseton
Sisseton's September 2026 forecast shows daily high temperatures ranging from 58° to 90°, with overnight lows between 42° and 68°. The average high for September is 73° with an average low of 55°. 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 Sisseton. See also: October | November | December.
