S
M
T
W
T
F
S
30
89°
58°
31
86°
57°
1
81°
50°
2
82°
49°
3
82°
45°
4
83°
50°
5
84°
49°
6
76°
46°
7
81°
47°
8
88°
46°
9
93°
44°
10
97°
47°
11
94°
64°
12
89°
61°
13
88°
59°
14
87°
54°
15
84°
43°
16
82°
70°
17
80°
63°
18
81°
51°
19
82°
42°
20
84°
40°
21
78°
48°
22
74°
49°
23
82°
40°
24
N/A
25
82°
49°
26
80°
40°
27
79°
51°
28
N/A
29
68°
50°
30
78°
50°
1
82°
50°
2
84°
53°
3
83°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mount Wilson
Mount Wilson's September 2026 forecast shows daily high temperatures ranging from 78° to 84°, with overnight lows between 50° and 54°. The average high for September is 82° with an average low of 52°. 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 Mount Wilson. See also: October | November | December.
