S
M
T
W
T
F
S
30
71°
46°
31
71°
52°
1
77°
55°
2
82°
57°
3
84°
57°
4
83°
53°
5
80°
55°
6
74°
54°
7
78°
53°
8
78°
49°
9
69°
53°
10
70°
51°
11
67°
50°
12
68°
47°
13
68°
44°
14
70°
46°
15
74°
52°
16
76°
50°
17
77°
48°
18
75°
51°
19
78°
52°
20
77°
53°
21
74°
50°
22
73°
50°
23
69°
49°
24
73°
48°
25
72°
50°
26
69°
46°
27
64°
50°
28
67°
49°
29
64°
45°
30
65°
47°
1
70°
49°
2
70°
48°
3
64°
45°
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 64° to 84°, with overnight lows between 44° and 57°. The average high for September is 73° 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 South. See also: October | November | December.
