S
M
T
W
T
F
S
30
74°
45°
31
74°
47°
1
75°
47°
2
73°
41°
3
73°
46°
4
74°
45°
5
72°
46°
6
73°
42°
7
81°
42°
8
77°
36°
9
69°
39°
10
72°
38°
11
73°
38°
12
75°
36°
13
74°
37°
14
76°
43°
15
81°
44°
16
80°
44°
17
82°
43°
18
80°
43°
19
81°
42°
20
81°
50°
21
80°
47°
22
81°
47°
23
80°
44°
24
76°
44°
25
68°
39°
26
65°
37°
27
67°
42°
28
74°
36°
29
68°
44°
30
73°
32°
1
66°
39°
2
72°
40°
3
74°
39°
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 65° to 82°, with overnight lows between 32° and 50°. The average high for September is 75° 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 Challis. See also: October | November | December.
