S
M
T
W
T
F
S
30
81°
63°
31
84°
67°
1
87°
67°
2
88°
66°
3
88°
62°
4
86°
58°
5
80°
59°
6
80°
63°
7
84°
64°
8
84°
64°
9
85°
65°
10
80°
63°
11
85°
65°
12
85°
65°
13
84°
64°
14
84°
65°
15
85°
64°
16
85°
63°
17
83°
64°
18
83°
57°
19
82°
55°
20
78°
53°
21
74°
52°
22
74°
58°
23
77°
56°
24
80°
53°
25
74°
52°
26
74°
52°
27
73°
51°
28
79°
56°
29
78°
57°
30
80°
57°
1
77°
58°
2
77°
55°
3
72°
56°
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 88°, with overnight lows between 51° and 67°. The average high for September is 81° 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 View. See also: October | November | December.
