S
M
T
W
T
F
S
30
84°
55°
31
85°
56°
1
86°
55°
2
84°
54°
3
84°
52°
4
83°
49°
5
80°
46°
6
78°
47°
7
78°
51°
8
81°
54°
9
84°
53°
10
83°
47°
11
78°
52°
12
79°
51°
13
81°
52°
14
81°
53°
15
82°
52°
16
80°
49°
17
69°
47°
18
74°
50°
19
69°
41°
20
69°
44°
21
Hist. Avg.
73°
45°
22
Hist. Avg.
72°
44°
23
Hist. Avg.
72°
44°
24
Hist. Avg.
71°
44°
25
Hist. Avg.
71°
43°
26
Hist. Avg.
70°
43°
27
Hist. Avg.
70°
42°
28
Hist. Avg.
69°
42°
29
Hist. Avg.
69°
42°
30
Hist. Avg.
68°
41°
1
Hist. Avg.
68°
41°
2
Hist. Avg.
67°
41°
3
Hist. Avg.
66°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Spokane Valley
Spokane Valley's September 2026 forecast shows daily high temperatures ranging from 69° to 86°, with overnight lows between 41° and 56°. The average high for September is 80° 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 Spokane Valley. See also: October | November | December.
