S
M
T
W
T
F
S
30
86°
61°
31
88°
60°
1
89°
59°
2
85°
54°
3
84°
54°
4
84°
56°
5
85°
57°
6
85°
58°
7
87°
56°
8
84°
54°
9
84°
52°
10
83°
52°
11
83°
54°
12
85°
57°
13
87°
54°
14
86°
52°
15
85°
59°
16
84°
59°
17
80°
58°
18
80°
59°
19
81°
59°
20
80°
58°
21
80°
58°
22
84°
57°
23
83°
58°
24
83°
58°
25
86°
57°
26
86°
56°
27
85°
53°
28
84°
52°
29
81°
53°
30
81°
56°
1
83°
57°
2
85°
55°
3
84°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cajon Junction
Cajon Junction's September 2026 forecast shows daily high temperatures ranging from 80° to 89°, with overnight lows between 52° and 61°. The average high for September is 84° with an average low of 56°. 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 Cajon Junction. See also: October | November | December.
