S
M
T
W
T
F
S
30
81°
56°
31
82°
52°
1
79°
50°
2
86°
50°
3
74°
59°
4
91°
60°
5
90°
64°
6
85°
68°
7
83°
57°
8
73°
51°
9
73°
51°
10
79°
53°
11
81°
49°
12
68°
45°
13
74°
53°
14
71°
51°
15
76°
51°
16
75°
50°
17
72°
49°
18
70°
46°
19
76°
51°
20
63°
49°
21
69°
52°
22
74°
52°
23
70°
51°
24
62°
50°
25
70°
50°
26
71°
51°
27
71°
50°
28
70°
49°
29
60°
48°
30
57°
42°
1
57°
43°
2
56°
39°
3
56°
46°
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 56° to 90°, with overnight lows between 39° and 68°. The average high for September is 71° 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.
