S
M
T
W
T
F
S
30
103°
81°
31
100°
80°
1
98°
79°
2
98°
78°
3
100°
77°
4
99°
76°
5
97°
75°
6
97°
77°
7
98°
78°
8
101°
79°
9
102°
78°
10
90°
69°
11
87°
68°
12
89°
69°
13
91°
72°
14
91°
72°
15
90°
71°
16
91°
72°
17
87°
71°
18
83°
71°
19
85°
70°
20
88°
71°
21
89°
71°
22
90°
70°
23
89°
69°
24
90°
70°
25
90°
69°
26
89°
68°
27
90°
68°
28
87°
67°
29
80°
68°
30
85°
67°
1
86°
67°
2
88°
66°
3
87°
66°
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 80° to 103°, with overnight lows between 66° and 81°. The average high for September is 92° with an average low of 72°. 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.
