S
M
T
W
T
F
S
26
84°
65°
27
84°
64°
28
88°
67°
29
90°
67°
30
90°
66°
31
89°
65°
1
85°
59°
2
84°
58°
3
79°
56°
4
77°
57°
5
79°
58°
6
80°
60°
7
84°
59°
8
85°
61°
9
87°
62°
10
86°
63°
11
86°
59°
12
84°
67°
13
84°
66°
14
Hist. Avg.
83°
61°
15
Hist. Avg.
83°
61°
16
Hist. Avg.
83°
61°
17
Hist. Avg.
83°
61°
18
Hist. Avg.
83°
61°
19
Hist. Avg.
83°
61°
20
Hist. Avg.
82°
60°
21
Hist. Avg.
82°
60°
22
Hist. Avg.
82°
60°
23
Hist. Avg.
82°
60°
24
Hist. Avg.
82°
60°
25
Hist. Avg.
82°
59°
26
Hist. Avg.
82°
59°
27
Hist. Avg.
82°
59°
28
Hist. Avg.
81°
59°
29
Hist. Avg.
81°
58°
30
Hist. Avg.
81°
58°
31
Hist. Avg.
81°
58°
1
Hist. Avg.
81°
58°
2
Hist. Avg.
80°
57°
3
Hist. Avg.
80°
57°
4
Hist. Avg.
80°
57°
5
Hist. Avg.
80°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Decorah
Decorah's August 2026 forecast shows daily high temperatures ranging from 77° to 90°, with overnight lows between 56° and 67°. The average high for August is 84° with an average low of 62°. 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.
