S
M
T
W
T
F
S
26
66°
55°
27
69°
50°
28
68°
52°
29
71°
54°
30
70°
56°
1
72°
57°
2
72°
55°
3
72°
56°
4
71°
55°
5
72°
53°
6
68°
51°
7
70°
52°
8
68°
51°
9
67°
50°
10
66°
50°
11
66°
49°
12
67°
50°
13
67°
51°
14
68°
51°
15
69°
52°
16
67°
52°
17
66°
51°
18
66°
50°
19
67°
51°
20
68°
56°
21
72°
58°
22
73°
58°
23
71°
55°
24
68°
54°
25
71°
56°
26
73°
58°
27
75°
59°
28
75°
59°
29
74°
58°
30
73°
57°
31
71°
55°
1
68°
53°
2
68°
55°
3
69°
56°
4
70°
55°
5
76°
60°
6
77°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Onofre
San Onofre's May 2026 forecast shows daily high temperatures ranging from 66° to 77°, with overnight lows between 49° and 60°. The average high for May is 70° with an average low of 54°. 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 Onofre. See also: June | July | August.
