S
M
T
W
T
F
S
30
79°
59°
31
81°
62°
1
82°
56°
2
81°
54°
3
78°
53°
4
77°
55°
5
80°
58°
6
85°
63°
7
87°
64°
8
88°
60°
9
82°
54°
10
79°
54°
11
80°
63°
12
81°
55°
13
86°
51°
14
77°
52°
15
76°
56°
16
79°
60°
17
83°
58°
18
82°
53°
19
76°
59°
20
81°
58°
21
83°
58°
22
83°
57°
23
82°
58°
24
81°
58°
25
82°
57°
26
80°
58°
27
81°
57°
28
82°
56°
29
81°
56°
30
81°
57°
1
80°
47°
2
81°
45°
3
78°
46°
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 76° to 88°, with overnight lows between 45° and 64°. The average high for September is 81° with an average low of 56°. 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.
