S
M
T
W
T
F
S
30
101°
73°
31
100°
74°
1
100°
72°
2
101°
74°
3
101°
74°
4
96°
75°
5
99°
71°
6
101°
73°
7
99°
74°
8
99°
74°
9
97°
73°
10
98°
74°
11
99°
75°
12
102°
73°
13
100°
72°
14
96°
71°
15
91°
70°
16
91°
69°
17
93°
69°
18
90°
67°
19
87°
67°
20
83°
50°
21
93°
67°
22
93°
67°
23
91°
66°
24
84°
65°
25
82°
65°
26
87°
64°
27
87°
64°
28
88°
63°
29
88°
64°
30
87°
57°
1
79°
53°
2
78°
52°
3
78°
52°
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 78° to 102°, with overnight lows between 50° and 75°. The average high for September is 90° 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 Stephenville. See also: October | November | December.
