S
M
T
W
T
F
S
30
81°
66°
31
83°
66°
1
84°
65°
2
86°
65°
3
86°
59°
4
85°
57°
5
79°
63°
6
82°
64°
7
84°
63°
8
79°
59°
9
77°
62°
10
80°
63°
11
85°
62°
12
85°
62°
13
84°
63°
14
85°
62°
15
83°
61°
16
83°
60°
17
81°
53°
18
75°
52°
19
75°
50°
20
74°
50°
21
73°
51°
22
73°
53°
23
74°
52°
24
79°
54°
25
79°
58°
26
78°
57°
27
80°
58°
28
79°
55°
29
78°
54°
30
77°
53°
1
74°
52°
2
76°
54°
3
70°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mattoon Township
Mattoon Township's September 2026 forecast shows daily high temperatures ranging from 70° to 86°, with overnight lows between 47° and 66°. The average high for September is 80° with an average low of 58°. 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 Mattoon Township. See also: October | November | December.
