S
M
T
W
T
F
S
27
80°
60°
28
80°
59°
29
78°
55°
30
80°
59°
1
77°
56°
2
72°
52°
3
72°
51°
4
73°
51°
5
72°
52°
6
73°
54°
7
72°
53°
8
73°
51°
9
74°
56°
10
75°
55°
11
72°
52°
12
71°
49°
13
70°
50°
14
70°
51°
15
71°
51°
16
71°
54°
17
74°
54°
18
76°
56°
19
76°
56°
20
75°
55°
21
75°
55°
22
76°
56°
23
76°
56°
24
77°
55°
25
75°
56°
26
74°
55°
27
68°
56°
28
72°
56°
29
70°
54°
30
68°
49°
31
67°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Sunnyvale
Sunnyvale's October 2026 forecast shows daily high temperatures ranging from 67° to 80°, with overnight lows between 49° and 60°. The average high for October is 74° with an average low of 54°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Sunnyvale. See also: November | December | January.
