S
M
T
W
T
F
S
26
89°
74°
27
88°
74°
28
88°
75°
29
89°
75°
30
88°
76°
31
88°
76°
1
89°
75°
2
88°
74°
3
88°
75°
4
89°
75°
5
89°
74°
6
88°
75°
7
89°
75°
8
90°
76°
9
89°
75°
10
90°
76°
11
90°
75°
12
89°
74°
13
Hist. Avg.
88°
75°
14
Hist. Avg.
88°
75°
15
Hist. Avg.
88°
75°
16
Hist. Avg.
88°
75°
17
Hist. Avg.
87°
75°
18
Hist. Avg.
87°
75°
19
Hist. Avg.
87°
75°
20
Hist. Avg.
87°
75°
21
Hist. Avg.
87°
75°
22
Hist. Avg.
87°
75°
23
Hist. Avg.
87°
75°
24
Hist. Avg.
87°
75°
25
Hist. Avg.
87°
75°
26
Hist. Avg.
87°
75°
27
Hist. Avg.
87°
75°
28
Hist. Avg.
87°
75°
29
Hist. Avg.
87°
75°
30
Hist. Avg.
87°
75°
31
Hist. Avg.
87°
75°
1
Hist. Avg.
87°
75°
2
Hist. Avg.
87°
75°
3
Hist. Avg.
87°
75°
4
Hist. Avg.
87°
75°
5
Hist. Avg.
87°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in San Mateo
San Mateo's August 2026 forecast shows daily high temperatures ranging from 88° to 90°, with overnight lows between 74° and 76°. The average high for August is 89° with an average low of 75°. 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.
