S
M
T
W
T
F
S
30
90°
71°
31
93°
72°
1
97°
71°
2
99°
73°
3
97°
73°
4
97°
73°
5
99°
73°
6
99°
72°
7
86°
72°
8
91°
68°
9
91°
68°
10
95°
70°
11
95°
73°
12
84°
73°
13
93°
72°
14
95°
68°
15
91°
73°
16
90°
72°
17
91°
64°
18
97°
68°
19
91°
72°
20
90°
70°
21
90°
68°
22
85°
69°
23
78°
63°
24
75°
57°
25
76°
56°
26
77°
53°
27
77°
54°
28
78°
59°
29
79°
58°
30
77°
60°
1
75°
59°
2
76°
56°
3
77°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grayson
Grayson's September 2026 forecast shows daily high temperatures ranging from 75° to 90°, with overnight lows between 53° and 69°. The average high for September is 78° with an average low of 60°. 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 Grayson. See also: October | November | December.
