S
M
T
W
T
F
S
26
83°
49°
27
80°
44°
28
83°
44°
29
78°
53°
30
71°
54°
1
67°
49°
2
65°
45°
3
75°
46°
4
82°
58°
5
74°
55°
6
75°
43°
7
80°
52°
8
87°
46°
9
92°
50°
10
90°
65°
11
86°
56°
12
94°
58°
13
97°
60°
14
93°
60°
15
93°
57°
16
93°
60°
17
91°
59°
18
90°
58°
19
90°
55°
20
93°
58°
21
91°
57°
22
91°
60°
23
90°
59°
24
90°
57°
25
89°
57°
26
90°
61°
27
90°
54°
28
86°
51°
29
85°
52°
30
90°
59°
31
90°
55°
1
89°
59°
2
90°
60°
3
93°
61°
4
94°
61°
5
94°
60°
6
94°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Ysidro
San Ysidro's May 2026 forecast shows daily high temperatures ranging from 85° to 94°, with overnight lows between 51° and 62°. The average high for May is 91° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in San Ysidro. See also: June | July | August.
