S
M
T
W
T
F
S
30
85°
43°
31
75°
47°
1
75°
51°
2
78°
50°
3
82°
45°
4
74°
46°
5
75°
49°
6
80°
50°
7
84°
40°
8
79°
38°
9
68°
41°
10
68°
39°
11
67°
38°
12
68°
39°
13
69°
45°
14
72°
48°
15
74°
48°
16
79°
40°
17
74°
40°
18
66°
44°
19
71°
45°
20
72°
43°
21
69°
35°
22
70°
33°
23
63°
35°
24
64°
37°
25
71°
40°
26
63°
32°
27
67°
40°
28
59°
29°
29
59°
33°
30
Hist. Avg.
67°
38°
1
Hist. Avg.
66°
37°
2
Hist. Avg.
66°
37°
3
Hist. Avg.
65°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Chinook
Chinook's September 2026 forecast shows daily high temperatures ranging from 59° to 85°, with overnight lows between 29° and 51°. The average high for September is 72° 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 Chinook. See also: October | November | December.
