S
M
T
W
T
F
S
30
84°
49°
31
72°
53°
1
75°
53°
2
74°
50°
3
74°
49°
4
81°
52°
5
78°
49°
6
75°
47°
7
74°
46°
8
73°
46°
9
70°
47°
10
70°
46°
11
69°
51°
12
73°
53°
13
79°
54°
14
78°
52°
15
79°
54°
16
79°
51°
17
75°
44°
18
68°
43°
19
67°
42°
20
73°
46°
21
75°
44°
22
72°
46°
23
72°
52°
24
71°
49°
25
65°
45°
26
64°
49°
27
63°
44°
28
61°
39°
29
60°
44°
30
62°
51°
1
63°
52°
2
63°
40°
3
62°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Spokane South
Spokane South's September 2026 forecast shows daily high temperatures ranging from 60° to 84°, with overnight lows between 37° and 54°. The average high for September is 71° 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 South. See also: October | November | December.
