S
M
T
W
T
F
S
26
92°
63°
27
93°
60°
28
98°
63°
29
92°
57°
30
92°
54°
31
97°
57°
1
97°
66°
2
96°
65°
3
98°
55°
4
97°
59°
5
94°
67°
6
94°
56°
7
96°
52°
8
97°
62°
9
94°
57°
10
96°
58°
11
91°
64°
12
87°
59°
13
85°
59°
14
83°
62°
15
86°
54°
16
88°
56°
17
89°
62°
18
92°
55°
19
94°
53°
20
93°
55°
21
90°
58°
22
90°
59°
23
89°
52°
24
91°
63°
25
93°
62°
26
91°
56°
27
91°
58°
28
92°
60°
29
92°
61°
30
90°
58°
31
92°
57°
1
90°
59°
2
91°
58°
3
88°
57°
4
87°
58°
5
84°
57°
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 84° to 93°, with overnight lows between 56° and 63°. The average high for August is 90° with an average low of 59°. 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.
