S
M
T
W
T
F
S
26
96°
66°
27
97°
65°
28
88°
68°
29
91°
66°
30
91°
65°
1
91°
68°
2
95°
67°
3
90°
67°
4
88°
66°
5
91°
66°
6
93°
68°
7
93°
70°
8
92°
68°
9
87°
66°
10
87°
65°
11
88°
66°
12
84°
65°
13
84°
65°
14
85°
66°
15
83°
67°
16
84°
67°
17
84°
66°
18
85°
67°
19
83°
67°
20
83°
66°
21
84°
67°
22
83°
68°
23
82°
67°
24
82°
67°
25
83°
66°
26
82°
67°
27
84°
68°
28
82°
68°
29
84°
67°
30
82°
67°
31
81°
68°
1
82°
68°
2
81°
67°
3
80°
68°
4
81°
68°
5
80°
67°
6
81°
68°
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 80° to 95°, with overnight lows between 65° and 70°. The average high for May is 85° with an average low of 67°. 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.
