S
M
T
W
T
F
S
30
85°
53°
31
85°
42°
1
72°
42°
2
72°
41°
3
81°
46°
4
82°
49°
5
82°
43°
6
77°
40°
7
69°
40°
8
68°
44°
9
66°
47°
10
67°
48°
11
68°
38°
12
67°
40°
13
67°
49°
14
74°
46°
15
67°
43°
16
66°
36°
17
65°
37°
18
67°
39°
19
71°
40°
20
72°
41°
21
69°
40°
22
66°
35°
23
63°
38°
24
63°
45°
25
67°
36°
26
62°
34°
27
62°
41°
28
63°
36°
29
61°
42°
30
67°
39°
1
60°
35°
2
62°
37°
3
65°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Kootenai
Kootenai's September 2026 forecast shows daily high temperatures ranging from 60° to 85°, with overnight lows between 34° and 53°. The average high for September is 69° with an average low of 41°. 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 Kootenai. See also: October | November | December.
