S
M
T
W
T
F
S
26
86°
69°
27
82°
62°
28
83°
63°
29
85°
67°
30
86°
61°
31
83°
61°
1
82°
60°
2
82°
60°
3
83°
61°
4
81°
59°
5
81°
61°
6
82°
60°
7
82°
61°
8
83°
64°
9
86°
64°
10
87°
61°
11
86°
62°
12
88°
67°
13
89°
59°
14
83°
59°
15
81°
61°
16
82°
63°
17
85°
59°
18
82°
58°
19
81°
59°
20
80°
57°
21
81°
58°
22
79°
56°
23
79°
57°
24
80°
58°
25
82°
64°
26
82°
65°
27
84°
66°
28
88°
59°
29
88°
56°
30
81°
56°
31
79°
61°
1
81°
62°
2
79°
55°
3
78°
54°
4
77°
61°
5
77°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Ottumwa
Ottumwa's August 2026 forecast shows daily high temperatures ranging from 77° to 89°, with overnight lows between 54° 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 Ottumwa. See also: September | October | November.
