S
M
T
W
T
F
S
30
90°
65°
31
88°
65°
1
89°
63°
2
90°
63°
3
91°
64°
4
88°
64°
5
87°
63°
6
85°
60°
7
90°
63°
8
91°
64°
9
91°
64°
10
92°
63°
11
91°
63°
12
90°
62°
13
88°
62°
14
81°
57°
15
82°
58°
16
83°
62°
17
89°
63°
18
90°
61°
19
89°
60°
20
89°
61°
21
88°
61°
22
88°
59°
23
84°
56°
24
82°
57°
25
86°
59°
26
86°
59°
27
87°
58°
28
85°
58°
29
82°
55°
30
85°
57°
1
80°
51°
2
74°
48°
3
75°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Garden Valley
Garden Valley's September 2026 forecast shows daily high temperatures ranging from 74° to 92°, with overnight lows between 48° and 65°. The average high for September is 86° with an average low of 60°. 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 Garden Valley. See also: October | November | December.
