S
M
T
W
T
F
S
26
94°
64°
27
91°
65°
28
93°
64°
29
94°
64°
30
95°
65°
31
96°
65°
1
95°
64°
2
96°
66°
3
95°
65°
4
94°
65°
5
94°
64°
6
93°
64°
7
94°
65°
8
94°
64°
9
93°
64°
10
92°
63°
11
88°
64°
12
89°
63°
13
88°
63°
14
92°
59°
15
87°
63°
16
94°
58°
17
89°
61°
18
93°
59°
19
86°
58°
20
88°
60°
21
92°
61°
22
91°
62°
23
93°
60°
24
87°
60°
25
89°
57°
26
91°
56°
27
90°
56°
28
90°
58°
29
91°
60°
30
91°
59°
31
90°
58°
1
91°
59°
2
92°
58°
3
91°
59°
4
91°
54°
5
89°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Ysidro
San Ysidro's August 2026 forecast shows daily high temperatures ranging from 86° to 96°, with overnight lows between 54° and 66°. The average high for August is 92° with an average low of 61°. 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 Ysidro. See also: September | October | November.
