S
M
T
W
T
F
S
30
73°
63°
31
82°
59°
1
79°
55°
2
81°
53°
3
87°
58°
4
73°
58°
5
79°
61°
6
82°
58°
7
80°
63°
8
81°
59°
9
72°
50°
10
77°
44°
11
80°
64°
12
66°
50°
13
64°
38°
14
60°
34°
15
66°
43°
16
69°
41°
17
69°
44°
18
61°
49°
19
65°
48°
20
64°
44°
21
65°
37°
22
65°
35°
23
68°
37°
24
60°
56°
25
66°
58°
26
62°
54°
27
66°
53°
28
66°
59°
29
62°
48°
30
59°
44°
1
61°
46°
2
64°
45°
3
60°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Garrison
Garrison's September 2026 forecast shows daily high temperatures ranging from 59° to 66°, with overnight lows between 41° and 59°. The average high for September is 63° with an average low of 50°. 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 Garrison. See also: October | November | December.
