S
M
T
W
T
F
S
30
99°
74°
31
99°
72°
1
99°
68°
2
99°
70°
3
97°
72°
4
97°
72°
5
99°
70°
6
97°
70°
7
90°
70°
8
97°
72°
9
79°
72°
10
82°
64°
11
84°
60°
12
82°
63°
13
81°
61°
14
95°
63°
15
91°
70°
16
90°
68°
17
93°
72°
18
97°
72°
19
95°
66°
20
71°
62°
21
67°
56°
22
63°
50°
23
68°
52°
24
70°
53°
25
72°
55°
26
75°
54°
27
72°
51°
28
74°
52°
29
73°
52°
30
73°
51°
1
74°
52°
2
73°
48°
3
74°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sibley
Sibley's September 2026 forecast shows daily high temperatures ranging from 63° to 95°, with overnight lows between 48° and 66°. The average high for September is 73° with an average low of 54°. 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 Sibley. See also: October | November | December.
