S
M
T
W
T
F
S
26
96°
74°
27
96°
74°
28
95°
77°
29
97°
75°
30
97°
77°
31
99°
73°
1
103°
74°
2
104°
78°
3
101°
73°
4
99°
76°
5
99°
75°
6
101°
78°
7
97°
76°
8
100°
74°
9
94°
75°
10
90°
76°
11
97°
76°
12
98°
77°
13
97°
76°
14
98°
77°
15
99°
77°
16
102°
71°
17
102°
67°
18
100°
74°
19
100°
74°
20
102°
75°
21
103°
75°
22
107°
77°
23
102°
76°
24
103°
73°
25
102°
74°
26
103°
77°
27
103°
76°
28
95°
76°
29
100°
73°
30
96°
76°
31
93°
74°
1
93°
75°
2
92°
74°
3
94°
75°
4
96°
74°
5
94°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Mission Valley
Mission Valley's August 2026 forecast shows daily high temperatures ranging from 92° to 103°, with overnight lows between 72° and 77°. The average high for August is 96° with an average low of 75°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Mission Valley. See also: September | October | November.
