S
M
T
W
T
F
S
26
96°
73°
27
94°
74°
28
86°
70°
29
85°
67°
30
83°
63°
31
75°
63°
1
82°
63°
2
81°
62°
3
83°
60°
4
74°
65°
5
69°
60°
6
81°
60°
7
83°
64°
8
81°
58°
9
84°
66°
10
86°
68°
11
89°
70°
12
85°
71°
13
79°
69°
14
74°
67°
15
80°
71°
16
80°
63°
17
81°
60°
18
85°
65°
19
82°
62°
20
82°
57°
21
85°
64°
22
81°
56°
23
77°
51°
24
79°
53°
25
80°
57°
26
82°
59°
27
82°
53°
28
83°
63°
29
77°
67°
30
91°
72°
31
88°
66°
1
85°
68°
2
88°
66°
3
85°
64°
4
82°
63°
5
82°
60°
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 77° to 91°, with overnight lows between 53° and 72°. The average high for August is 84° with an average low of 64°. 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.
