S
M
T
W
T
F
S
30
92°
74°
31
92°
75°
1
91°
77°
2
89°
76°
3
88°
73°
4
87°
75°
5
86°
76°
6
87°
76°
7
87°
74°
8
88°
76°
9
90°
75°
10
89°
75°
11
90°
74°
12
88°
75°
13
90°
76°
14
90°
70°
15
87°
72°
16
86°
71°
17
85°
72°
18
87°
74°
19
88°
74°
20
89°
73°
21
87°
74°
22
86°
74°
23
87°
73°
24
85°
72°
25
84°
73°
26
86°
73°
27
86°
72°
28
85°
73°
29
88°
72°
30
88°
72°
1
87°
71°
2
87°
72°
3
85°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Stephenville
Stephenville's September 2026 forecast shows daily high temperatures ranging from 84° to 92°, with overnight lows between 68° and 77°. The average high for September is 88° with an average low of 73°. 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 Stephenville. See also: October | November | December.
