S
M
T
W
T
F
S
31
88°
52°
1
90°
50°
2
91°
55°
3
91°
57°
4
79°
58°
5
72°
45°
6
81°
39°
7
79°
50°
8
86°
54°
9
84°
50°
10
88°
52°
11
82°
52°
12
78°
53°
13
70°
54°
14
79°
49°
15
70°
46°
16
70°
41°
17
72°
45°
18
77°
45°
19
79°
45°
20
82°
50°
21
82°
45°
22
66°
45°
23
68°
41°
24
79°
46°
25
82°
43°
26
79°
46°
27
81°
41°
28
82°
45°
29
81°
54°
30
81°
52°
1
77°
52°
2
82°
45°
3
75°
45°
4
55°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort Smith
Fort Smith's September 2025 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.
