S
M
T
W
T
F
S
26
67°
57°
27
68°
56°
28
68°
54°
29
69°
53°
30
69°
59°
1
69°
59°
2
69°
61°
3
70°
62°
4
68°
57°
5
67°
56°
6
69°
57°
7
69°
58°
8
70°
62°
9
70°
61°
10
70°
60°
11
70°
59°
12
69°
62°
13
71°
62°
14
70°
63°
15
69°
60°
16
68°
59°
17
68°
59°
18
68°
58°
19
71°
60°
20
70°
61°
21
72°
63°
22
70°
62°
23
67°
63°
24
69°
62°
25
68°
63°
26
68°
62°
27
71°
63°
28
70°
61°
29
66°
57°
30
67°
58°
31
70°
62°
1
73°
63°
2
74°
65°
3
74°
65°
4
73°
59°
5
67°
59°
6
67°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Diego
San Diego's May 2026 forecast shows daily high temperatures ranging from 66° to 74°, with overnight lows between 57° and 65°. The average high for May is 70° 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 May weather will actually feel in San Diego. See also: June | July | August.
