S
M
T
W
T
F
S
30
83°
61°
31
83°
59°
1
84°
58°
2
79°
57°
3
78°
63°
4
82°
64°
5
85°
63°
6
86°
56°
7
78°
55°
8
78°
61°
9
80°
61°
10
81°
60°
11
78°
62°
12
77°
60°
13
77°
53°
14
75°
52°
15
75°
52°
16
76°
53°
17
75°
58°
18
79°
59°
19
81°
60°
20
82°
58°
21
80°
57°
22
79°
59°
23
79°
50°
24
81°
49°
25
71°
48°
26
72°
51°
27
79°
56°
28
77°
56°
29
Hist. Avg.
74°
50°
30
Hist. Avg.
74°
50°
1
Hist. Avg.
73°
50°
2
Hist. Avg.
73°
49°
3
Hist. Avg.
72°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Champaign
Champaign's September 2026 forecast shows daily high temperatures ranging from 71° to 86°, with overnight lows between 48° and 64°. The average high for September is 79° with an average low of 57°. 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.
