S
M
T
W
T
F
S
26
64°
54°
27
65°
52°
28
71°
49°
29
72°
50°
30
71°
54°
1
74°
57°
2
73°
57°
3
65°
56°
4
67°
55°
5
66°
53°
6
72°
52°
7
77°
54°
8
75°
59°
9
79°
59°
10
77°
58°
11
78°
57°
12
68°
59°
13
73°
57°
14
71°
56°
15
70°
59°
16
70°
60°
17
67°
59°
18
72°
57°
19
84°
54°
20
87°
57°
21
80°
59°
22
71°
59°
23
71°
59°
24
70°
57°
25
71°
56°
26
67°
58°
27
67°
56°
28
67°
52°
29
71°
54°
30
77°
57°
31
82°
59°
1
80°
57°
2
78°
57°
3
82°
58°
4
84°
59°
5
81°
58°
6
82°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mission Viejo
Mission Viejo's May 2026 forecast shows daily high temperatures ranging from 71° to 84°, with overnight lows between 54° and 60°. The average high for May is 80° with an average low of 58°. 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 Mission Viejo. See also: June | July | August.
