S
M
T
W
T
F
S
26
56°
36°
27
55°
35°
28
59°
35°
29
58°
39°
30
48°
38°
1
60°
34°
2
73°
36°
3
75°
47°
4
75°
45°
5
47°
31°
6
40°
29°
7
74°
36°
8
71°
39°
9
75°
47°
10
72°
45°
11
85°
47°
12
80°
51°
13
90°
56°
14
86°
59°
15
84°
51°
16
79°
55°
17
71°
45°
18
42°
35°
19
51°
42°
20
60°
43°
21
65°
45°
22
65°
45°
23
70°
47°
24
77°
51°
25
84°
53°
26
75°
50°
27
75°
49°
28
82°
51°
29
82°
55°
30
80°
54°
31
78°
46°
1
72°
50°
2
72°
48°
3
71°
42°
4
74°
47°
5
77°
47°
6
78°
48°
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 42° to 84°, with overnight lows between 35° and 55°. The average high for May is 72° with an average low of 47°. 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.
