S
M
T
W
T
F
S
30
66°
52°
31
79°
52°
1
79°
46°
2
64°
50°
3
69°
47°
4
68°
44°
5
72°
45°
6
71°
47°
7
67°
47°
8
67°
44°
9
75°
46°
10
77°
47°
11
72°
46°
12
70°
45°
13
72°
44°
14
73°
43°
15
73°
45°
16
72°
40°
17
64°
39°
18
63°
41°
19
63°
34°
20
64°
43°
21
63°
41°
22
65°
44°
23
64°
35°
24
61°
32°
25
60°
32°
26
60°
36°
27
67°
39°
28
70°
40°
29
71°
42°
30
69°
42°
1
70°
41°
2
70°
42°
3
69°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Libby
Libby's September 2026 forecast shows daily high temperatures ranging from 60° to 77°, with overnight lows between 32° and 47°. The average high for September is 68° with an average low of 42°. 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 Libby. See also: October | November | December.
