S
M
T
W
T
F
S
30
82°
58°
31
82°
57°
1
83°
58°
2
85°
61°
3
85°
56°
4
83°
55°
5
78°
55°
6
81°
56°
7
80°
52°
8
74°
51°
9
75°
51°
10
77°
52°
11
80°
52°
12
82°
55°
13
82°
57°
14
81°
57°
15
81°
50°
16
78°
47°
17
72°
45°
18
70°
46°
19
70°
47°
20
74°
49°
21
78°
56°
22
79°
54°
23
76°
54°
24
70°
53°
25
69°
46°
26
70°
43°
27
67°
43°
28
66°
45°
29
68°
45°
30
76°
49°
1
69°
49°
2
Hist. Avg.
80°
40°
3
Hist. Avg.
80°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Wilson
Mount Wilson's September 2026 forecast shows daily high temperatures ranging from 66° to 85°, with overnight lows between 43° and 61°. The average high for September is 76° 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.
