S
M
T
W
T
F
S
26
88°
68°
27
88°
69°
28
87°
68°
29
87°
68°
30
88°
67°
31
87°
67°
1
87°
68°
2
88°
67°
3
87°
67°
4
88°
68°
5
87°
67°
6
86°
66°
7
84°
65°
8
85°
64°
9
83°
65°
10
80°
65°
11
84°
67°
12
86°
63°
13
87°
64°
14
83°
66°
15
87°
64°
16
88°
58°
17
84°
56°
18
78°
54°
19
76°
53°
20
76°
54°
21
77°
55°
22
76°
55°
23
76°
56°
24
77°
59°
25
81°
61°
26
83°
54°
27
76°
53°
28
76°
54°
29
79°
59°
30
80°
62°
31
83°
53°
1
82°
51°
2
74°
53°
3
75°
59°
4
79°
58°
5
83°
51°
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 74° to 88°, with overnight lows between 51° and 69°. The average high for August is 83° with an average low of 61°. 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.
