S
M
T
W
T
F
S
26
66°
53°
27
69°
51°
28
69°
46°
29
72°
49°
30
70°
52°
1
72°
52°
2
72°
59°
3
69°
58°
4
68°
56°
5
67°
54°
6
70°
51°
7
72°
51°
8
74°
59°
9
73°
57°
10
73°
57°
11
76°
52°
12
68°
57°
13
73°
59°
14
71°
59°
15
72°
60°
16
70°
57°
17
72°
55°
18
70°
55°
19
76°
50°
20
79°
51°
21
74°
55°
22
71°
58°
23
70°
60°
24
70°
58°
25
69°
58°
26
66°
56°
27
68°
56°
28
69°
50°
29
74°
61°
30
72°
61°
31
73°
62°
1
72°
61°
2
72°
61°
3
73°
62°
4
67°
55°
5
69°
60°
6
73°
61°
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 66° to 74°, with overnight lows between 50° and 62°. The average high for May is 71° 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 May weather will actually feel in San Ysidro. See also: June | July | August.
