S
M
T
W
T
F
S
30
83°
58°
31
85°
57°
1
81°
51°
2
77°
48°
3
73°
53°
4
75°
52°
5
78°
54°
6
82°
55°
7
82°
51°
8
70°
48°
9
70°
46°
10
71°
47°
11
71°
47°
12
72°
48°
13
70°
52°
14
70°
54°
15
69°
53°
16
77°
52°
17
73°
46°
18
67°
52°
19
66°
47°
20
68°
43°
21
74°
45°
22
69°
41°
23
67°
42°
24
70°
45°
25
74°
49°
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 66° to 85°, with overnight lows between 41° and 58°. The average high for September is 73° 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.
