S
M
T
W
T
F
S
27
76°
48°
28
63°
54°
29
55°
51°
30
64°
49°
1
70°
48°
2
67°
45°
3
75°
40°
4
73°
44°
5
73°
43°
6
79°
43°
7
80°
45°
8
76°
40°
9
77°
46°
10
71°
50°
11
74°
49°
12
74°
47°
13
69°
43°
14
68°
38°
15
67°
40°
16
62°
38°
17
59°
35°
18
65°
38°
19
67°
39°
20
70°
40°
21
69°
39°
22
68°
33°
23
63°
34°
24
62°
35°
25
64°
38°
26
65°
38°
27
65°
37°
28
67°
37°
29
64°
36°
30
59°
36°
31
60°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in San Mateo
San Mateo's October 2026 forecast shows daily high temperatures ranging from 59° to 77°, with overnight lows between 33° and 50°. The average high for October is 66° with an average low of 39°. 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 San Mateo. See also: November | December | January.
