S
M
T
W
T
F
S
30
91°
69°
31
90°
64°
1
87°
64°
2
86°
65°
3
89°
65°
4
90°
64°
5
90°
67°
6
89°
67°
7
85°
65°
8
85°
62°
9
86°
61°
10
84°
60°
11
84°
59°
12
85°
59°
13
83°
60°
14
82°
59°
15
83°
60°
16
84°
60°
17
83°
63°
18
87°
64°
19
87°
63°
20
82°
64°
21
Hist. Avg.
85°
64°
22
Hist. Avg.
84°
64°
23
Hist. Avg.
84°
63°
24
Hist. Avg.
84°
63°
25
Hist. Avg.
84°
62°
26
Hist. Avg.
83°
62°
27
Hist. Avg.
83°
62°
28
Hist. Avg.
82°
61°
29
Hist. Avg.
82°
61°
30
Hist. Avg.
82°
61°
1
Hist. Avg.
82°
60°
2
Hist. Avg.
81°
60°
3
Hist. Avg.
81°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Grayson Valley
Grayson Valley's September 2026 forecast shows daily high temperatures ranging from 82° to 91°, with overnight lows between 59° and 69°. The average high for September is 86° with an average low of 63°. 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 Grayson Valley. See also: October | November | December.
