S
M
T
W
T
F
S
30
95°
67°
31
95°
66°
1
85°
57°
2
83°
58°
3
86°
60°
4
84°
62°
5
90°
60°
6
86°
64°
7
93°
64°
8
97°
68°
9
101°
74°
10
103°
77°
11
99°
74°
12
100°
62°
13
87°
59°
14
88°
63°
15
93°
65°
16
94°
68°
17
90°
56°
18
92°
58°
19
91°
57°
20
89°
56°
21
89°
56°
22
88°
57°
23
88°
58°
24
86°
56°
25
86°
53°
26
87°
54°
27
88°
54°
28
83°
50°
29
85°
53°
30
82°
53°
1
81°
52°
2
79°
53°
3
80°
54°
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 100°, with overnight lows between 50° and 68°. The average high for September is 88° with an average low of 57°. 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.
