S
M
T
W
T
F
S
30
100°
67°
31
99°
66°
1
100°
67°
2
100°
68°
3
97°
66°
4
98°
67°
5
99°
67°
6
99°
66°
7
98°
67°
8
97°
66°
9
93°
65°
10
92°
64°
11
94°
65°
12
96°
66°
13
98°
66°
14
99°
65°
15
98°
66°
16
96°
65°
17
97°
63°
18
97°
62°
19
91°
59°
20
86°
60°
21
88°
63°
22
93°
61°
23
87°
59°
24
86°
60°
25
88°
61°
26
91°
60°
27
92°
61°
28
92°
59°
29
85°
58°
30
84°
55°
1
84°
57°
2
85°
59°
3
88°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Coso Junction
Coso Junction's September 2026 forecast shows daily high temperatures ranging from 84° to 100°, with overnight lows between 55° and 68°. The average high for September is 93° with an average low of 63°. 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 Coso Junction. See also: October | November | December.
