S
M
T
W
T
F
S
30
93°
68°
31
92°
68°
1
92°
63°
2
89°
62°
3
88°
65°
4
90°
67°
5
92°
68°
6
94°
68°
7
94°
67°
8
93°
68°
9
94°
67°
10
93°
68°
11
93°
67°
12
92°
66°
13
94°
64°
14
85°
59°
15
84°
60°
16
85°
60°
17
85°
63°
18
87°
62°
19
90°
58°
20
83°
62°
21
88°
63°
22
89°
62°
23
90°
55°
24
85°
53°
25
80°
52°
26
85°
52°
27
88°
61°
28
Hist. Avg.
84°
57°
29
Hist. Avg.
84°
56°
30
Hist. Avg.
83°
56°
1
Hist. Avg.
83°
55°
2
Hist. Avg.
83°
55°
3
Hist. Avg.
82°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mountain View
Mountain View's September 2026 forecast shows daily high temperatures ranging from 80° to 94°, with overnight lows between 52° and 68°. The average high for September is 89° with an average low of 63°. 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.
