S
M
T
W
T
F
S
30
80°
50°
31
81°
45°
1
81°
49°
2
85°
47°
3
85°
50°
4
84°
44°
5
81°
47°
6
82°
48°
7
79°
44°
8
76°
45°
9
76°
42°
10
75°
42°
11
77°
43°
12
80°
41°
13
80°
44°
14
81°
47°
15
81°
47°
16
80°
41°
17
76°
38°
18
72°
37°
19
70°
37°
20
71°
38°
21
73°
43°
22
77°
45°
23
77°
46°
24
73°
44°
25
74°
45°
26
72°
37°
27
68°
36°
28
69°
42°
29
69°
41°
30
71°
40°
1
Hist. Avg.
72°
44°
2
Hist. Avg.
72°
44°
3
Hist. Avg.
72°
43°
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 85°, with overnight lows between 36° and 50°. The average high for September is 77° with an average low of 43°. 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.
