S
M
T
W
T
F
S
30
69°
52°
31
70°
55°
1
70°
56°
2
72°
56°
3
76°
57°
4
76°
56°
5
75°
56°
6
73°
55°
7
67°
55°
8
68°
54°
9
72°
55°
10
72°
54°
11
75°
54°
12
75°
53°
13
74°
54°
14
74°
53°
15
68°
51°
16
63°
48°
17
66°
51°
18
69°
52°
19
68°
52°
20
69°
53°
21
70°
47°
22
71°
47°
23
71°
46°
24
70°
44°
25
71°
37°
26
65°
49°
27
69°
49°
28
70°
51°
29
71°
40°
30
69°
37°
1
64°
39°
2
64°
44°
3
63°
43°
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 63° to 76°, with overnight lows between 37° and 57°. The average high for September is 70° 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.
