S
M
T
W
T
F
S
26
86°
68°
27
82°
67°
28
81°
67°
29
81°
64°
30
81°
64°
31
82°
63°
1
84°
68°
2
84°
68°
3
82°
66°
4
80°
65°
5
79°
66°
6
81°
66°
7
82°
65°
8
82°
66°
9
80°
66°
10
81°
67°
11
77°
67°
12
76°
68°
13
77°
67°
14
76°
67°
15
76°
67°
16
74°
63°
17
74°
64°
18
75°
65°
19
77°
67°
20
78°
66°
21
78°
67°
22
80°
67°
23
80°
68°
24
79°
68°
25
80°
67°
26
80°
67°
27
79°
68°
28
80°
68°
29
79°
67°
30
80°
68°
31
80°
68°
1
79°
67°
2
80°
67°
3
77°
66°
4
76°
67°
5
76°
66°
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 74° to 84°, with overnight lows between 63° and 68°. The average high for August is 79° with an average low of 67°. 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.
