S
M
T
W
T
F
S
30
65°
45°
31
64°
45°
1
64°
46°
2
63°
44°
3
63°
44°
4
62°
48°
5
59°
48°
6
58°
49°
7
57°
46°
8
58°
42°
9
58°
46°
10
57°
47°
11
56°
43°
12
56°
47°
13
57°
45°
14
55°
45°
15
Hist. Avg.
55°
42°
16
Hist. Avg.
55°
42°
17
Hist. Avg.
54°
42°
18
Hist. Avg.
54°
41°
19
Hist. Avg.
54°
41°
20
Hist. Avg.
53°
41°
21
Hist. Avg.
53°
40°
22
Hist. Avg.
52°
40°
23
Hist. Avg.
52°
40°
24
Hist. Avg.
51°
39°
25
Hist. Avg.
51°
39°
26
Hist. Avg.
50°
38°
27
Hist. Avg.
50°
38°
28
Hist. Avg.
50°
38°
29
Hist. Avg.
49°
37°
30
Hist. Avg.
49°
37°
1
Hist. Avg.
48°
36°
2
Hist. Avg.
48°
36°
3
Hist. Avg.
47°
35°
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 55° to 65°, with overnight lows between 42° and 49°. The average high for September is 60° with an average low of 46°. 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.
