S
M
T
W
T
F
S
30
93°
62°
31
97°
72°
1
98°
71°
2
99°
71°
3
99°
72°
4
98°
70°
5
97°
69°
6
94°
65°
7
91°
67°
8
93°
66°
9
90°
67°
10
91°
64°
11
86°
58°
12
83°
59°
13
86°
62°
14
89°
66°
15
79°
62°
16
79°
61°
17
81°
61°
18
83°
60°
19
83°
61°
20
84°
61°
21
83°
60°
22
83°
60°
23
82°
59°
24
83°
59°
25
83°
58°
26
82°
57°
27
83°
58°
28
82°
58°
29
83°
57°
30
82°
57°
1
81°
56°
2
81°
57°
3
80°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Carbondale
Carbondale's September 2026 forecast shows daily high temperatures ranging from 79° to 99°, with overnight lows between 56° and 72°. The average high for September is 86° with an average low of 62°. 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 Carbondale. See also: October | November | December.
