S
M
T
W
T
F
S
30
70°
50°
31
63°
53°
1
78°
51°
2
82°
60°
3
77°
61°
4
61°
44°
5
61°
36°
6
65°
41°
7
67°
54°
8
68°
39°
9
60°
53°
10
58°
51°
11
52°
44°
12
59°
35°
13
58°
47°
14
54°
39°
15
53°
35°
16
51°
35°
17
65°
38°
18
57°
36°
19
67°
39°
20
76°
44°
21
75°
45°
22
56°
39°
23
63°
34°
24
61°
36°
25
51°
32°
26
45°
34°
27
47°
30°
28
54°
25°
29
50°
41°
30
43°
35°
1
46°
29°
2
56°
33°
3
48°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort Smith
Fort Smith's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Fort Smith. See also: October | November | December.
