S
M
T
W
T
F
S
30
67°
51°
31
69°
51°
1
81°
50°
2
85°
51°
3
86°
51°
4
87°
53°
5
84°
52°
6
82°
57°
7
82°
56°
8
82°
54°
9
79°
52°
10
79°
51°
11
78°
51°
12
81°
50°
13
82°
51°
14
77°
44°
15
80°
48°
16
81°
48°
17
80°
47°
18
80°
48°
19
79°
48°
20
79°
45°
21
78°
46°
22
79°
46°
23
79°
45°
24
78°
46°
25
77°
46°
26
76°
45°
27
72°
44°
28
76°
44°
29
73°
43°
30
68°
44°
1
69°
43°
2
68°
38°
3
71°
42°
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 68° to 87°, with overnight lows between 38° and 57°. The average high for September is 78° with an average low of 48°. 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.
