S
M
T
W
T
F
S
30
72°
50°
31
N/A
1
85°
55°
2
71°
54°
3
67°
49°
4
68°
43°
5
73°
44°
6
76°
52°
7
76°
52°
8
75°
50°
9
79°
52°
10
82°
53°
11
81°
53°
12
79°
52°
13
78°
50°
14
77°
47°
15
82°
52°
16
81°
49°
17
68°
44°
18
69°
45°
19
74°
50°
20
69°
47°
21
67°
42°
22
67°
41°
23
73°
47°
24
66°
48°
25
68°
44°
26
74°
47°
27
76°
50°
28
75°
49°
29
64°
43°
30
72°
46°
1
73°
48°
2
66°
48°
3
62°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Spokane Valley
Spokane Valley's September 2026 forecast shows daily high temperatures ranging from 62° to 85°, with overnight lows between 41° and 55°. The average high for September is 73° with an average low of 48°. 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.
