S
M
T
W
T
F
S
30
96°
71°
31
95°
70°
1
94°
68°
2
94°
64°
3
88°
65°
4
90°
70°
5
93°
70°
6
94°
69°
7
93°
70°
8
92°
69°
9
93°
70°
10
93°
69°
11
92°
67°
12
88°
64°
13
85°
67°
14
87°
67°
15
84°
66°
16
83°
67°
17
85°
66°
18
83°
58°
19
82°
57°
20
80°
58°
21
81°
58°
22
81°
64°
23
85°
64°
24
87°
65°
25
88°
64°
26
87°
61°
27
81°
62°
28
80°
56°
29
80°
55°
30
77°
58°
1
Hist. Avg.
82°
57°
2
Hist. Avg.
81°
57°
3
Hist. Avg.
81°
56°
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 77° to 96°, with overnight lows between 55° and 71°. The average high for September is 87° with an average low of 65°. 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.
