S
M
T
W
T
F
S
26
72°
59°
27
71°
57°
28
72°
59°
29
72°
58°
30
75°
57°
31
74°
56°
1
72°
57°
2
81°
57°
3
77°
56°
4
73°
58°
5
68°
59°
6
73°
59°
7
69°
58°
8
68°
58°
9
75°
58°
10
75°
58°
11
76°
57°
12
69°
58°
13
69°
59°
14
71°
60°
15
65°
58°
16
71°
58°
17
76°
58°
18
70°
57°
19
67°
57°
20
69°
55°
21
69°
58°
22
67°
59°
23
76°
56°
24
72°
58°
25
70°
59°
26
67°
56°
27
76°
59°
28
66°
60°
29
71°
54°
30
75°
55°
31
66°
54°
1
72°
61°
2
71°
60°
3
73°
58°
4
72°
56°
5
72°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Mateo
San Mateo's August 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in San Mateo. See also: September | October | November.
