S
M
T
W
T
F
S
30
77°
64°
31
86°
66°
1
89°
64°
2
82°
64°
3
80°
66°
4
80°
66°
5
83°
62°
6
80°
58°
7
73°
58°
8
71°
59°
9
76°
58°
10
72°
50°
11
70°
50°
12
69°
51°
13
67°
52°
14
72°
49°
15
75°
55°
16
75°
53°
17
73°
54°
18
74°
55°
19
74°
54°
20
73°
53°
21
74°
55°
22
75°
55°
23
74°
54°
24
74°
54°
25
73°
53°
26
74°
53°
27
73°
52°
28
73°
52°
29
72°
51°
30
71°
51°
1
71°
50°
2
70°
50°
3
71°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Junction City
Junction City's September 2026 forecast shows daily high temperatures ranging from 67° to 89°, with overnight lows between 49° and 66°. The average high for September is 74° with an average low of 55°. 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 Junction City. See also: October | November | December.
