S
M
T
W
T
F
S
30
89°
70°
31
89°
70°
1
88°
69°
2
89°
70°
3
88°
69°
4
86°
66°
5
84°
65°
6
87°
64°
7
88°
68°
8
89°
69°
9
88°
69°
10
88°
68°
11
87°
69°
12
88°
68°
13
86°
68°
14
85°
65°
15
88°
66°
16
88°
65°
17
87°
66°
18
85°
61°
19
87°
64°
20
87°
64°
21
86°
62°
22
85°
64°
23
84°
63°
24
82°
62°
25
82°
62°
26
81°
61°
27
82°
62°
28
78°
61°
29
82°
61°
30
82°
60°
1
81°
60°
2
79°
52°
3
76°
51°
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 76° to 89°, with overnight lows between 51° and 70°. The average high for September is 85° with an average low of 64°. 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.
