S
M
T
W
T
F
S
26
85°
69°
27
87°
64°
28
86°
63°
29
86°
64°
30
87°
65°
31
90°
68°
1
92°
66°
2
88°
66°
3
87°
64°
4
86°
63°
5
86°
64°
6
87°
65°
7
85°
65°
8
85°
67°
9
86°
67°
10
86°
69°
11
87°
67°
12
87°
66°
13
90°
69°
14
92°
63°
15
88°
62°
16
86°
63°
17
89°
65°
18
90°
66°
19
91°
64°
20
85°
62°
21
86°
63°
22
86°
64°
23
88°
62°
24
85°
67°
25
85°
67°
26
86°
66°
27
90°
67°
28
92°
67°
29
92°
66°
30
91°
60°
31
85°
60°
1
85°
64°
2
89°
65°
3
89°
64°
4
88°
63°
5
89°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Waterloo
Waterloo's August 2026 forecast shows daily high temperatures ranging from 85° to 92°, with overnight lows between 60° and 69°. The average high for August is 88° with an average low of 65°. 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 Waterloo. See also: September | October | November.
