S
M
T
W
T
F
S
30
72°
55°
31
70°
57°
1
74°
58°
2
78°
59°
3
78°
58°
4
78°
55°
5
78°
54°
6
76°
60°
7
82°
59°
8
81°
62°
9
82°
63°
10
83°
63°
11
83°
61°
12
80°
60°
13
78°
61°
14
80°
57°
15
78°
60°
16
74°
58°
17
80°
59°
18
78°
58°
19
73°
55°
20
75°
60°
21
75°
58°
22
79°
58°
23
74°
57°
24
72°
53°
25
73°
53°
26
72°
54°
27
71°
53°
28
72°
54°
29
73°
53°
30
72°
56°
1
72°
54°
2
73°
55°
3
78°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Los Altos
Los Altos's September 2026 forecast shows daily high temperatures ranging from 71° to 83°, with overnight lows between 53° and 63°. The average high for September is 77° with an average low of 57°. 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 Los Altos. See also: October | November | December.
