S
M
T
W
T
F
S
30
80°
62°
31
81°
62°
1
84°
64°
2
86°
67°
3
84°
67°
4
86°
63°
5
83°
61°
6
80°
60°
7
80°
62°
8
82°
65°
9
80°
64°
10
79°
65°
11
83°
64°
12
85°
65°
13
84°
64°
14
84°
65°
15
83°
64°
16
83°
64°
17
82°
63°
18
82°
59°
19
81°
60°
20
80°
54°
21
76°
58°
22
75°
60°
23
78°
59°
24
80°
54°
25
79°
54°
26
78°
60°
27
79°
59°
28
76°
57°
29
77°
56°
30
77°
57°
1
78°
55°
2
78°
56°
3
73°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Granite Falls
Granite Falls's September 2026 forecast shows daily high temperatures ranging from 73° to 86°, with overnight lows between 54° and 67°. The average high for September is 80° with an average low of 61°. 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 Granite Falls. See also: October | November | December.
