S
M
T
W
T
F
S
30
69°
49°
31
67°
48°
1
64°
48°
2
60°
45°
3
57°
45°
4
56°
44°
5
56°
44°
6
57°
41°
7
53°
34°
8
53°
34°
9
55°
33°
10
51°
32°
11
49°
29°
12
50°
32°
13
50°
29°
14
51°
31°
15
54°
38°
16
57°
42°
17
59°
41°
18
51°
43°
19
55°
40°
20
55°
31°
21
50°
29°
22
48°
29°
23
44°
27°
24
44°
26°
25
45°
28°
26
45°
35°
27
46°
40°
28
49°
36°
29
53°
40°
30
54°
39°
1
50°
37°
2
53°
35°
3
53°
33°
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 44° to 69°, with overnight lows between 26° and 49°. The average high for September is 53° with an average low of 37°. 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.
