S
M
T
W
T
F
S
30
71°
49°
31
82°
43°
1
77°
55°
2
68°
49°
3
64°
51°
4
64°
48°
5
73°
44°
6
75°
52°
7
66°
51°
8
72°
47°
9
80°
50°
10
81°
49°
11
71°
50°
12
70°
50°
13
74°
50°
14
75°
52°
15
77°
53°
16
72°
51°
17
73°
52°
18
73°
50°
19
72°
47°
20
66°
52°
21
73°
52°
22
72°
49°
23
70°
51°
24
75°
51°
25
75°
50°
26
74°
50°
27
66°
49°
28
63°
43°
29
61°
38°
30
60°
44°
1
67°
43°
2
70°
44°
3
69°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Post Falls
Post Falls's September 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 38° and 53°. The average high for September is 71° with an average low of 49°. 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 Post Falls. See also: October | November | December.
