S
M
T
W
T
F
S
30
103°
77°
31
102°
77°
1
101°
76°
2
101°
78°
3
96°
75°
4
101°
75°
5
101°
77°
6
102°
76°
7
103°
76°
8
103°
78°
9
104°
80°
10
87°
71°
11
97°
68°
12
104°
75°
13
100°
77°
14
100°
78°
15
101°
80°
16
101°
79°
17
99°
75°
18
99°
76°
19
99°
77°
20
92°
73°
21
83°
69°
22
88°
66°
23
92°
65°
24
93°
71°
25
89°
68°
26
92°
69°
27
93°
69°
28
89°
72°
29
85°
70°
30
80°
65°
1
77°
61°
2
77°
63°
3
81°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oklahoma City Southwest
Oklahoma City Southwest's September 2026 forecast shows daily high temperatures ranging from 77° to 93°, with overnight lows between 57° and 72°. The average high for September is 85° with an average low of 66°. 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 Oklahoma City Southwest. See also: October | November | December.
