S
M
T
W
T
F
S
26
87°
75°
27
92°
73°
28
94°
77°
29
95°
75°
30
89°
75°
1
70°
58°
2
80°
54°
3
85°
61°
4
86°
71°
5
95°
75°
6
93°
71°
7
85°
71°
8
82°
70°
9
91°
68°
10
91°
71°
11
91°
73°
12
93°
72°
13
92°
71°
14
91°
69°
15
91°
73°
16
90°
73°
17
92°
72°
18
91°
73°
19
92°
73°
20
92°
72°
21
89°
73°
22
88°
72°
23
87°
73°
24
89°
74°
25
87°
72°
26
88°
71°
27
87°
69°
28
88°
74°
29
88°
74°
30
89°
73°
31
89°
73°
1
90°
72°
2
91°
72°
3
92°
73°
4
94°
74°
5
93°
72°
6
93°
74°
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 70° to 95°, with overnight lows between 54° and 75°. The average high for May is 89° with an average low of 71°. 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.
