S
M
T
W
T
F
S
30
79°
60°
31
82°
61°
1
82°
60°
2
81°
61°
3
83°
54°
4
76°
52°
5
75°
56°
6
76°
59°
7
81°
60°
8
81°
59°
9
79°
56°
10
75°
58°
11
80°
57°
12
80°
59°
13
79°
58°
14
80°
58°
15
80°
57°
16
79°
57°
17
77°
56°
18
79°
50°
19
71°
48°
20
72°
47°
21
69°
46°
22
70°
48°
23
72°
51°
24
72°
47°
25
69°
47°
26
70°
53°
27
69°
52°
28
74°
53°
29
75°
52°
30
75°
53°
1
72°
51°
2
74°
51°
3
67°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grafton
Grafton's September 2026 forecast shows daily high temperatures ranging from 67° to 83°, with overnight lows between 46° and 61°. The average high for September is 76° with an average low of 54°. 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 Grafton. See also: October | November | December.
