S
M
T
W
T
F
S
30
90°
56°
31
81°
57°
1
81°
61°
2
82°
63°
3
88°
65°
4
89°
64°
5
90°
56°
6
85°
55°
7
81°
53°
8
80°
54°
9
82°
61°
10
82°
59°
11
81°
53°
12
79°
52°
13
78°
55°
14
80°
60°
15
78°
50°
16
83°
49°
17
75°
49°
18
75°
50°
19
76°
49°
20
75°
49°
21
74°
48°
22
75°
48°
23
75°
49°
24
78°
53°
25
81°
56°
26
81°
52°
27
82°
48°
28
73°
55°
29
75°
52°
30
79°
48°
1
75°
51°
2
74°
50°
3
70°
47°
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 70° to 90°, with overnight lows between 47° and 65°. The average high for September is 80° 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 Rantoul. See also: October | November | December.
