S
M
T
W
T
F
S
30
86°
64°
31
94°
66°
1
95°
69°
2
94°
68°
3
91°
66°
4
90°
65°
5
89°
64°
6
88°
64°
7
87°
63°
8
87°
64°
9
84°
60°
10
83°
58°
11
81°
48°
12
84°
62°
13
84°
62°
14
80°
62°
15
82°
61°
16
81°
62°
17
82°
61°
18
82°
61°
19
81°
60°
20
82°
62°
21
82°
61°
22
81°
60°
23
82°
60°
24
82°
59°
25
81°
60°
26
82°
58°
27
81°
59°
28
81°
58°
29
80°
57°
30
79°
57°
1
79°
56°
2
78°
56°
3
78°
55°
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 78° to 95°, with overnight lows between 48° and 69°. The average high for September is 84° with an average low of 61°. 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.
