S
M
T
W
T
F
S
30
73°
49°
31
74°
50°
1
74°
49°
2
73°
46°
3
71°
45°
4
72°
40°
5
72°
44°
6
77°
49°
7
82°
50°
8
79°
49°
9
79°
49°
10
77°
48°
11
73°
45°
12
70°
44°
13
69°
37°
14
67°
37°
15
66°
38°
16
68°
42°
17
73°
47°
18
69°
41°
19
63°
39°
20
64°
36°
21
66°
37°
22
65°
34°
23
66°
34°
24
65°
35°
25
68°
38°
26
69°
39°
27
66°
33°
28
64°
29°
29
59°
28°
30
58°
31°
1
60°
31°
2
62°
32°
3
65°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Challis
Challis's September 2026 forecast shows daily high temperatures ranging from 58° to 82°, with overnight lows between 28° and 50°. The average high for September is 69° with an average low of 40°. 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 Challis. See also: October | November | December.
