S
M
T
W
T
F
S
27
71°
56°
28
70°
52°
29
71°
54°
30
72°
54°
1
77°
55°
2
71°
54°
3
72°
53°
4
77°
57°
5
78°
58°
6
78°
59°
7
79°
59°
8
79°
58°
9
78°
57°
10
76°
58°
11
77°
57°
12
76°
57°
13
73°
50°
14
68°
53°
15
69°
49°
16
68°
50°
17
68°
49°
18
69°
49°
19
70°
50°
20
71°
51°
21
74°
55°
22
74°
51°
23
66°
56°
24
66°
56°
25
70°
53°
26
66°
47°
27
65°
47°
28
65°
48°
29
66°
46°
30
66°
48°
31
67°
52°
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 65° to 79°, with overnight lows between 46° and 59°. The average high for October is 72° with an average low of 53°. 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.
