S
M
T
W
T
F
S
30
82°
59°
31
82°
48°
1
81°
49°
2
71°
47°
3
69°
46°
4
69°
48°
5
70°
48°
6
75°
58°
7
79°
54°
8
81°
46°
9
74°
49°
10
72°
45°
11
71°
56°
12
74°
46°
13
73°
43°
14
67°
47°
15
69°
55°
16
73°
50°
17
74°
44°
18
67°
49°
19
71°
44°
20
74°
42°
21
65°
47°
22
64°
55°
23
75°
48°
24
75°
46°
25
73°
51°
26
65°
52°
27
70°
50°
28
72°
52°
29
70°
52°
30
72°
48°
1
73°
39°
2
70°
38°
3
58°
39°
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 82°, with overnight lows between 38° and 59°. The average high for September is 72° with an average low of 48°. 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.
