S
M
T
W
T
F
S
26
87°
66°
27
86°
67°
28
83°
69°
29
82°
61°
30
86°
60°
31
87°
63°
1
81°
66°
2
80°
63°
3
83°
61°
4
84°
58°
5
86°
55°
6
84°
69°
7
85°
68°
8
88°
64°
9
88°
57°
10
85°
66°
11
76°
63°
12
75°
63°
13
81°
63°
14
80°
69°
15
81°
70°
16
85°
71°
17
82°
63°
18
81°
57°
19
82°
61°
20
81°
63°
21
85°
59°
22
79°
60°
23
75°
55°
24
78°
52°
25
80°
52°
26
84°
54°
27
81°
61°
28
81°
57°
29
83°
53°
30
82°
66°
31
87°
66°
1
90°
71°
2
94°
71°
3
91°
67°
4
85°
67°
5
82°
61°
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 82° to 94°, with overnight lows between 61° and 71°. The average high for August is 88° with an average low of 67°. 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.
