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
78°
65°
12
83°
67°
13
81°
64°
14
81°
59°
15
76°
67°
16
81°
62°
17
78°
58°
18
76°
59°
19
78°
60°
20
79°
61°
21
81°
60°
22
78°
61°
23
77°
58°
24
78°
56°
25
74°
58°
26
78°
62°
27
79°
62°
28
81°
61°
29
74°
57°
30
73°
56°
31
72°
55°
1
73°
59°
2
76°
60°
3
77°
61°
4
79°
60°
5
80°
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 72° to 83°, with overnight lows between 55° and 67°. The average high for August is 78° with an average low of 60°. 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.
