S
M
T
W
T
F
S
30
93°
69°
31
96°
70°
1
96°
73°
2
95°
71°
3
95°
71°
4
94°
73°
5
94°
73°
6
93°
72°
7
94°
72°
8
95°
73°
9
91°
72°
10
93°
72°
11
92°
71°
12
93°
72°
13
94°
72°
14
93°
70°
15
92°
65°
16
85°
63°
17
83°
68°
18
88°
68°
19
84°
67°
20
84°
65°
21
83°
64°
22
83°
67°
23
87°
67°
24
86°
66°
25
89°
67°
26
89°
66°
27
88°
64°
28
87°
64°
29
86°
63°
30
87°
63°
1
85°
62°
2
87°
64°
3
79°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grapevine
Grapevine's September 2026 forecast shows daily high temperatures ranging from 79° to 96°, with overnight lows between 57° and 73°. The average high for September is 90° with an average low of 68°. 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 Grapevine. See also: October | November | December.
