S
M
T
W
T
F
S
30
83°
42°
31
71°
44°
1
73°
45°
2
73°
42°
3
74°
41°
4
80°
44°
5
76°
41°
6
74°
40°
7
73°
38°
8
71°
39°
9
69°
39°
10
68°
40°
11
68°
44°
12
72°
46°
13
75°
47°
14
76°
46°
15
77°
45°
16
76°
42°
17
71°
36°
18
66°
36°
19
66°
34°
20
71°
38°
21
72°
37°
22
70°
38°
23
69°
45°
24
69°
43°
25
63°
39°
26
61°
43°
27
61°
38°
28
59°
33°
29
57°
37°
30
59°
44°
1
60°
45°
2
61°
35°
3
62°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Spokane State Park
Mount Spokane State Park's September 2026 forecast shows daily high temperatures ranging from 57° to 83°, with overnight lows between 32° and 47°. The average high for September is 69° with an average low of 41°. 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 Mount Spokane State Park. See also: October | November | December.
