S
M
T
W
T
F
S
26
69°
54°
27
71°
54°
28
77°
49°
29
79°
51°
30
76°
57°
1
82°
58°
2
80°
60°
3
70°
55°
4
68°
51°
5
69°
49°
6
73°
50°
7
76°
52°
8
76°
56°
9
80°
57°
10
79°
58°
11
80°
57°
12
81°
56°
13
78°
57°
14
76°
56°
15
74°
55°
16
72°
57°
17
74°
58°
18
75°
59°
19
75°
60°
20
74°
60°
21
75°
59°
22
75°
60°
23
76°
60°
24
76°
59°
25
75°
60°
26
75°
60°
27
73°
58°
28
69°
58°
29
68°
57°
30
68°
58°
31
69°
59°
1
70°
60°
2
72°
59°
3
71°
59°
4
71°
58°
5
72°
58°
6
70°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Rancho Bernardo
Rancho Bernardo's May 2026 forecast shows daily high temperatures ranging from 68° to 81°, with overnight lows between 49° and 60°. The average high for May is 74° with an average low of 57°. 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 Rancho Bernardo. See also: June | July | August.
