S
M
T
W
T
F
S
26
79°
61°
27
79°
64°
28
80°
61°
29
80°
61°
30
81°
67°
31
86°
67°
1
87°
68°
2
87°
68°
3
86°
67°
4
86°
60°
5
79°
58°
6
78°
57°
7
77°
58°
8
78°
58°
9
78°
59°
10
79°
64°
11
79°
64°
12
84°
67°
13
86°
66°
14
85°
65°
15
86°
59°
16
83°
58°
17
79°
58°
18
80°
59°
19
81°
60°
20
77°
58°
21
78°
58°
22
79°
62°
23
83°
64°
24
85°
64°
25
81°
57°
26
77°
59°
27
79°
64°
28
77°
64°
29
84°
65°
30
85°
64°
31
84°
62°
1
80°
63°
2
82°
60°
3
76°
61°
4
77°
63°
5
77°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Garnavillo
Garnavillo's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 57° and 68°. The average high for August is 81° 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 Garnavillo. See also: September | October | November.
