S
M
T
W
T
F
S
30
106°
72°
31
105°
76°
1
105°
76°
2
104°
75°
3
102°
78°
4
106°
76°
5
106°
78°
6
105°
77°
7
105°
76°
8
105°
77°
9
105°
78°
10
99°
77°
11
94°
74°
12
99°
74°
13
102°
74°
14
102°
77°
15
103°
75°
16
100°
78°
17
102°
75°
18
100°
72°
19
100°
70°
20
98°
74°
21
92°
69°
22
91°
72°
23
93°
72°
24
92°
67°
25
88°
66°
26
89°
66°
27
87°
65°
28
88°
65°
29
87°
66°
30
83°
53°
1
87°
65°
2
80°
64°
3
83°
63°
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 80° to 102°, with overnight lows between 53° and 75°. The average high for September is 91° with an average low of 67°. 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.
