S
M
T
W
T
F
S
26
94°
74°
27
93°
72°
28
85°
70°
29
85°
66°
30
83°
62°
31
79°
62°
1
80°
62°
2
82°
60°
3
83°
60°
4
74°
65°
5
70°
61°
6
81°
63°
7
84°
63°
8
80°
56°
9
84°
54°
10
89°
68°
11
90°
73°
12
85°
70°
13
80°
70°
14
77°
69°
15
82°
70°
16
79°
58°
17
81°
65°
18
80°
63°
19
79°
56°
20
78°
62°
21
77°
60°
22
78°
59°
23
79°
58°
24
78°
61°
25
81°
63°
26
80°
62°
27
81°
60°
28
80°
56°
29
79°
61°
30
84°
62°
31
80°
61°
1
74°
60°
2
74°
56°
3
72°
53°
4
73°
55°
5
75°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Marshalltown
Marshalltown's August 2026 forecast shows daily high temperatures ranging from 72° to 84°, with overnight lows between 53° and 70°. The average high for August is 78° with an average low of 60°. 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 Marshalltown. See also: September | October | November.
