S
M
T
W
T
F
S
30
86°
59°
31
85°
58°
1
84°
57°
2
84°
56°
3
83°
56°
4
83°
57°
5
82°
53°
6
82°
51°
7
83°
53°
8
82°
54°
9
79°
49°
10
71°
44°
11
71°
51°
12
72°
44°
13
69°
43°
14
66°
42°
15
68°
42°
16
68°
44°
17
69°
43°
18
69°
48°
19
70°
44°
20
68°
45°
21
70°
43°
22
66°
41°
23
74°
47°
24
65°
47°
25
70°
45°
26
Hist. Avg.
69°
45°
27
Hist. Avg.
69°
45°
28
Hist. Avg.
68°
44°
29
Hist. Avg.
68°
44°
30
Hist. Avg.
67°
44°
1
Hist. Avg.
67°
43°
2
Hist. Avg.
66°
43°
3
Hist. Avg.
66°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Post Falls-Rathdrum
Post Falls-Rathdrum's September 2026 forecast shows daily high temperatures ranging from 65° to 86°, with overnight lows between 41° and 59°. The average high for September is 75° 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-Rathdrum. See also: October | November | December.
