S
M
T
W
T
F
S
30
73°
52°
31
73°
48°
1
77°
56°
2
75°
58°
3
78°
64°
4
75°
60°
5
69°
54°
6
70°
51°
7
N/A
8
69°
53°
9
68°
63°
10
71°
49°
11
66°
48°
12
71°
57°
13
75°
56°
14
68°
51°
15
71°
57°
16
67°
48°
17
63°
51°
18
65°
49°
19
63°
49°
20
61°
44°
21
59°
49°
22
60°
49°
23
65°
48°
24
67°
47°
25
68°
49°
26
67°
45°
27
60°
42°
28
65°
46°
29
67°
47°
30
68°
48°
1
68°
48°
2
67°
47°
3
65°
45°
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 59° to 75°, with overnight lows between 42° and 63°. The average high for September is 66° with an average low of 49°. 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.
