S
M
T
W
T
F
S
30
89°
66°
31
87°
65°
1
83°
65°
2
83°
64°
3
86°
64°
4
87°
65°
5
86°
64°
6
89°
66°
7
89°
65°
8
87°
65°
9
82°
64°
10
82°
64°
11
81°
63°
12
80°
65°
13
83°
64°
14
86°
65°
15
85°
63°
16
79°
62°
17
81°
60°
18
80°
63°
19
83°
55°
20
81°
57°
21
84°
60°
22
85°
59°
23
Hist. Avg.
87°
58°
24
Hist. Avg.
87°
58°
25
Hist. Avg.
86°
57°
26
Hist. Avg.
86°
57°
27
Hist. Avg.
85°
57°
28
Hist. Avg.
85°
56°
29
Hist. Avg.
84°
56°
30
Hist. Avg.
84°
55°
1
Hist. Avg.
84°
55°
2
Hist. Avg.
83°
55°
3
Hist. Avg.
83°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mountain Pass
Mountain Pass's September 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 55° and 66°. The average high for September is 84° 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 Mountain Pass. See also: October | November | December.
