S
M
T
W
T
F
S
30
79°
49°
31
79°
52°
1
80°
52°
2
83°
48°
3
77°
52°
4
80°
56°
5
86°
57°
6
88°
48°
7
79°
50°
8
76°
51°
9
84°
49°
10
73°
48°
11
74°
55°
12
80°
53°
13
80°
57°
14
81°
54°
15
82°
50°
16
74°
47°
17
Hist. Avg.
72°
41°
18
Hist. Avg.
72°
41°
19
Hist. Avg.
71°
41°
20
Hist. Avg.
70°
40°
21
Hist. Avg.
70°
40°
22
Hist. Avg.
70°
40°
23
Hist. Avg.
69°
39°
24
Hist. Avg.
69°
39°
25
Hist. Avg.
68°
38°
26
Hist. Avg.
68°
38°
27
Hist. Avg.
67°
38°
28
Hist. Avg.
67°
37°
29
Hist. Avg.
66°
37°
30
Hist. Avg.
66°
37°
1
Hist. Avg.
65°
36°
2
Hist. Avg.
65°
36°
3
Hist. Avg.
64°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Fort Smith
Fort Smith's September 2026 forecast shows daily high temperatures ranging from 73° to 88°, with overnight lows between 47° and 57°. The average high for September is 80° with an average low of 52°. 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.
