S
M
T
W
T
F
S
30
100°
75°
31
101°
72°
1
100°
74°
2
102°
75°
3
99°
75°
4
98°
72°
5
100°
71°
6
98°
69°
7
97°
70°
8
95°
67°
9
90°
65°
10
86°
58°
11
82°
58°
12
86°
64°
13
87°
64°
14
85°
63°
15
86°
62°
16
86°
63°
17
85°
63°
18
86°
62°
19
86°
64°
20
85°
63°
21
85°
63°
22
84°
62°
23
84°
62°
24
83°
61°
25
82°
60°
26
83°
59°
27
84°
60°
28
83°
59°
29
82°
58°
30
83°
59°
1
83°
58°
2
82°
58°
3
82°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rantoul
Rantoul's September 2026 forecast shows daily high temperatures ranging from 82° to 102°, with overnight lows between 57° and 75°. The average high for September is 88° with an average low of 64°. 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 Rantoul. See also: October | November | December.
