S
M
T
W
T
F
S
27
89°
68°
28
88°
68°
29
89°
67°
30
87°
67°
1
88°
66°
2
87°
66°
3
87°
65°
4
86°
66°
5
83°
66°
6
85°
65°
7
85°
65°
8
86°
66°
9
85°
65°
10
84°
63°
11
81°
60°
12
74°
56°
13
72°
52°
14
70°
51°
15
71°
51°
16
71°
52°
17
72°
56°
18
72°
51°
19
70°
50°
20
69°
50°
21
70°
54°
22
72°
59°
23
83°
50°
24
79°
52°
25
76°
48°
26
80°
45°
27
68°
46°
28
69°
57°
29
70°
58°
30
76°
45°
31
79°
43°
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 68° to 89°, with overnight lows between 43° and 68°. The average high for October is 79° with an average low of 57°. 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.
