S
M
T
W
T
F
S
26
82°
65°
27
83°
63°
28
80°
65°
29
79°
64°
30
79°
62°
31
82°
66°
1
80°
67°
2
84°
66°
3
84°
66°
4
83°
62°
5
81°
66°
6
86°
67°
7
87°
66°
8
79°
66°
9
85°
63°
10
79°
61°
11
81°
65°
12
81°
66°
13
85°
64°
14
78°
58°
15
79°
60°
16
81°
63°
17
78°
63°
18
81°
61°
19
84°
62°
20
84°
64°
21
80°
57°
22
77°
58°
23
85°
65°
24
86°
64°
25
87°
63°
26
85°
56°
27
86°
55°
28
76°
54°
29
75°
53°
30
77°
56°
31
80°
60°
1
78°
53°
2
82°
52°
3
74°
51°
4
73°
51°
5
73°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Decorah
Decorah's August 2026 forecast shows daily high temperatures ranging from 73° to 87°, with overnight lows between 51° and 67°. The average high for August is 81° 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 Decorah. See also: September | October | November.
