S
M
T
W
T
F
S
30
64°
55°
31
74°
44°
1
73°
42°
2
61°
41°
3
60°
43°
4
58°
46°
5
58°
40°
6
61°
47°
7
69°
53°
8
69°
46°
9
68°
43°
10
64°
45°
11
64°
40°
12
62°
45°
13
65°
43°
14
57°
42°
15
57°
47°
16
65°
48°
17
66°
40°
18
58°
48°
19
60°
40°
20
60°
34°
21
52°
37°
22
53°
45°
23
54°
41°
24
62°
35°
25
62°
40°
26
50°
44°
27
54°
43°
28
55°
42°
29
56°
43°
30
52°
37°
1
58°
35°
2
49°
33°
3
48°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sioux Lookout
Sioux Lookout's September 2026 forecast shows daily high temperatures ranging from 48° to 74°, with overnight lows between 33° and 55°. The average high for September is 60° with an average low of 42°. 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 Sioux Lookout. See also: October | November | December.
