S
M
T
W
T
F
S
30
88°
66°
31
91°
66°
1
93°
70°
2
94°
71°
3
94°
72°
4
96°
72°
5
93°
70°
6
82°
62°
7
82°
60°
8
87°
57°
9
88°
64°
10
75°
63°
11
81°
61°
12
89°
66°
13
82°
58°
14
79°
54°
15
97°
60°
16
89°
71°
17
94°
68°
18
83°
69°
19
83°
67°
20
83°
65°
21
66°
60°
22
73°
58°
23
65°
58°
24
73°
57°
25
74°
56°
26
75°
52°
27
77°
50°
28
76°
45°
29
84°
48°
30
81°
64°
1
90°
63°
2
71°
50°
3
73°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Champaign
Champaign's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Champaign. See also: October | November | December.
