S
M
T
W
T
F
S
30
99°
77°
31
99°
77°
1
99°
76°
2
102°
78°
3
100°
81°
4
99°
78°
5
99°
82°
6
97°
76°
7
100°
76°
8
99°
79°
9
94°
77°
10
96°
79°
11
99°
79°
12
98°
80°
13
97°
78°
14
95°
77°
15
94°
74°
16
91°
75°
17
93°
73°
18
91°
74°
19
92°
71°
20
90°
71°
21
91°
70°
22
90°
74°
23
90°
73°
24
85°
73°
25
85°
72°
26
83°
72°
27
86°
73°
28
86°
72°
29
88°
72°
30
87°
66°
1
84°
64°
2
82°
63°
3
82°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sinton
Sinton's September 2026 forecast shows daily high temperatures ranging from 82° to 99°, with overnight lows between 62° and 80°. The average high for September is 90° 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 Sinton. See also: October | November | December.
