S
M
T
W
T
F
S
30
77°
61°
31
79°
61°
1
77°
59°
2
77°
60°
3
80°
59°
4
76°
61°
5
76°
61°
6
77°
57°
7
80°
61°
8
81°
61°
9
81°
62°
10
82°
62°
11
81°
61°
12
80°
60°
13
78°
61°
14
75°
59°
15
75°
57°
16
78°
60°
17
81°
62°
18
82°
61°
19
81°
60°
20
81°
60°
21
82°
61°
22
81°
60°
23
79°
59°
24
77°
58°
25
80°
59°
26
80°
60°
27
81°
59°
28
80°
59°
29
79°
55°
30
80°
59°
1
77°
56°
2
72°
51°
3
73°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mountain View
Mountain View's September 2026 forecast shows daily high temperatures ranging from 72° to 82°, with overnight lows between 51° and 62°. The average high for September is 79° with an average low of 59°. 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 View. See also: October | November | December.
