S
M
T
W
T
F
S
26
104°
80°
27
99°
80°
28
96°
78°
29
93°
76°
30
85°
70°
31
79°
65°
1
86°
63°
2
88°
60°
3
90°
67°
4
75°
63°
5
77°
61°
6
80°
64°
7
89°
62°
8
88°
68°
9
90°
69°
10
88°
68°
11
85°
64°
12
84°
64°
13
78°
60°
14
79°
59°
15
80°
60°
16
79°
61°
17
80°
60°
18
79°
60°
19
84°
61°
20
88°
67°
21
89°
66°
22
90°
67°
23
87°
66°
24
87°
66°
25
88°
65°
26
82°
63°
27
86°
64°
28
87°
63°
29
87°
64°
30
88°
65°
31
88°
65°
1
87°
64°
2
88°
65°
3
89°
65°
4
88°
64°
5
88°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Missouri Valley
Missouri Valley's August 2026 forecast shows daily high temperatures ranging from 78° to 90°, with overnight lows between 59° and 69°. The average high for August is 85° with an average low of 64°. 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 Missouri Valley. See also: September | October | November.
