S
M
T
W
T
F
S
26
83°
75°
27
87°
76°
28
89°
75°
29
90°
73°
30
86°
67°
1
72°
57°
2
77°
55°
3
81°
51°
4
82°
59°
5
86°
68°
6
87°
69°
7
75°
66°
8
75°
64°
9
92°
69°
10
90°
65°
11
84°
67°
12
86°
63°
13
89°
61°
14
90°
63°
15
87°
68°
16
88°
69°
17
88°
78°
18
90°
79°
19
90°
70°
20
84°
67°
21
84°
69°
22
90°
70°
23
84°
69°
24
87°
68°
25
89°
68°
26
87°
72°
27
82°
71°
28
85°
73°
29
89°
72°
30
91°
74°
31
88°
71°
1
86°
70°
2
84°
66°
3
85°
71°
4
88°
72°
5
87°
73°
6
89°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mission Valley
Mission Valley's May 2026 forecast shows daily high temperatures ranging from 82° to 91°, with overnight lows between 66° and 74°. The average high for May is 87° 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 Mission Valley. See also: June | July | August.
