S
M
T
W
T
F
S
30
71°
50°
31
72°
52°
1
75°
55°
2
74°
51°
3
73°
47°
4
68°
45°
5
73°
51°
6
74°
51°
7
63°
50°
8
73°
51°
9
74°
52°
10
75°
50°
11
72°
49°
12
67°
48°
13
68°
48°
14
64°
45°
15
60°
46°
16
67°
47°
17
60°
47°
18
67°
46°
19
61°
44°
20
55°
44°
21
55°
40°
22
54°
40°
23
54°
43°
24
56°
44°
25
66°
45°
26
67°
46°
27
67°
46°
28
66°
43°
29
64°
42°
30
64°
42°
1
58°
38°
2
53°
41°
3
50°
38°
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 50° to 75°, with overnight lows between 38° and 55°. The average high for September is 65° with an average low of 46°. 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.
