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
85°
67°
10
83°
69°
11
85°
68°
12
84°
64°
13
77°
62°
14
78°
63°
15
74°
60°
16
76°
58°
17
79°
64°
18
82°
65°
19
80°
59°
20
81°
58°
21
78°
62°
22
93°
70°
23
86°
65°
24
82°
65°
25
83°
66°
26
86°
66°
27
86°
64°
28
85°
62°
29
76°
60°
30
76°
57°
31
75°
58°
1
76°
62°
2
77°
63°
3
81°
63°
4
81°
64°
5
83°
62°
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 74° to 93°, with overnight lows between 57° and 70°. The average high for August is 81° with an average low of 63°. 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.
