S
M
T
W
T
F
S
30
91°
64°
31
90°
65°
1
89°
66°
2
89°
68°
3
88°
66°
4
85°
66°
5
84°
65°
6
80°
64°
7
80°
66°
8
81°
61°
9
79°
62°
10
80°
58°
11
79°
58°
12
79°
57°
13
80°
56°
14
77°
57°
15
78°
55°
16
77°
56°
17
78°
55°
18
77°
54°
19
78°
55°
20
77°
57°
21
80°
58°
22
80°
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 77° to 91°, with overnight lows between 54° and 68°. The average high for September is 82° with an average low of 60°. 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.
