S
M
T
W
T
F
S
30
90°
67°
31
90°
66°
1
88°
66°
2
87°
65°
3
85°
66°
4
88°
66°
5
88°
65°
6
87°
66°
7
86°
61°
8
88°
61°
9
86°
60°
10
85°
59°
11
79°
62°
12
85°
61°
13
87°
61°
14
88°
52°
15
80°
51°
16
74°
52°
17
74°
59°
18
75°
59°
19
84°
58°
20
81°
58°
21
80°
54°
22
80°
53°
23
82°
57°
24
82°
58°
25
80°
57°
26
79°
56°
27
81°
48°
28
73°
49°
29
70°
48°
30
69°
47°
1
70°
50°
2
68°
52°
3
68°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Spokane
Spokane's September 2026 forecast shows daily high temperatures ranging from 68° to 90°, with overnight lows between 47° and 67°. The average high for September is 81° with an average low of 58°. 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. See also: October | November | December.
