S
M
T
W
T
F
S
30
100°
71°
31
101°
73°
1
101°
71°
2
101°
73°
3
99°
78°
4
100°
72°
5
103°
72°
6
100°
73°
7
101°
73°
8
103°
73°
9
101°
80°
10
83°
70°
11
90°
69°
12
95°
72°
13
97°
73°
14
97°
75°
15
96°
73°
16
99°
72°
17
96°
70°
18
86°
63°
19
81°
60°
20
80°
57°
21
78°
59°
22
82°
62°
23
82°
61°
24
80°
55°
25
85°
62°
26
85°
61°
27
84°
62°
28
84°
61°
29
81°
61°
30
82°
60°
1
82°
59°
2
81°
60°
3
83°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Siloam Springs
Siloam Springs's September 2026 forecast shows daily high temperatures ranging from 78° to 99°, with overnight lows between 55° and 75°. The average high for September is 86° with an average low of 64°. 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 Siloam Springs. See also: October | November | December.
