S
M
T
W
T
F
S
30
98°
71°
31
99°
75°
1
99°
75°
2
100°
73°
3
97°
72°
4
99°
73°
5
N/A
6
102°
77°
7
102°
76°
8
103°
78°
9
103°
75°
10
96°
72°
11
95°
74°
12
98°
73°
13
93°
69°
14
89°
71°
15
91°
69°
16
91°
67°
17
86°
65°
18
87°
66°
19
80°
58°
20
82°
65°
21
86°
64°
22
85°
64°
23
86°
65°
24
86°
65°
25
85°
64°
26
83°
63°
27
83°
63°
28
84°
62°
29
83°
63°
30
78°
57°
1
75°
52°
2
70°
48°
3
68°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Granby
Granby's September 2026 forecast shows daily high temperatures ranging from 68° to 103°, with overnight lows between 48° and 78°. The average high for September is 88° with an average low of 65°. 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 Granby. See also: October | November | December.
