S
M
T
W
T
F
S
26
90°
67°
27
85°
64°
28
85°
64°
29
86°
67°
30
85°
70°
31
91°
65°
1
88°
67°
2
85°
69°
3
86°
64°
4
84°
65°
5
86°
64°
6
85°
63°
7
84°
63°
8
Hist. Avg.
89°
68°
9
Hist. Avg.
89°
68°
10
Hist. Avg.
89°
68°
11
Hist. Avg.
89°
67°
12
Hist. Avg.
88°
67°
13
Hist. Avg.
88°
67°
14
Hist. Avg.
88°
67°
15
Hist. Avg.
88°
67°
16
Hist. Avg.
88°
66°
17
Hist. Avg.
88°
66°
18
Hist. Avg.
88°
66°
19
Hist. Avg.
88°
66°
20
Hist. Avg.
88°
66°
21
Hist. Avg.
87°
65°
22
Hist. Avg.
87°
65°
23
Hist. Avg.
87°
65°
24
Hist. Avg.
87°
64°
25
Hist. Avg.
87°
64°
26
Hist. Avg.
86°
64°
27
Hist. Avg.
86°
64°
28
Hist. Avg.
86°
63°
29
Hist. Avg.
86°
63°
30
Hist. Avg.
86°
63°
31
Hist. Avg.
85°
62°
1
Hist. Avg.
85°
62°
2
Hist. Avg.
85°
62°
3
Hist. Avg.
85°
62°
4
Hist. Avg.
84°
61°
5
Hist. Avg.
84°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Waterloo
Waterloo's August 2026 forecast shows daily high temperatures ranging from 84° to 91°, with overnight lows between 63° and 70°. The average high for August is 86° with an average low of 66°. 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.
