S
M
T
W
T
F
S
26
65°
54°
27
66°
54°
28
63°
50°
29
61°
50°
30
62°
52°
31
62°
54°
1
63°
53°
2
63°
51°
3
62°
49°
4
62°
49°
5
63°
55°
6
64°
54°
7
65°
54°
8
65°
53°
9
64°
54°
10
65°
54°
11
66°
55°
12
67°
54°
13
66°
52°
14
66°
54°
15
66°
54°
16
67°
53°
17
66°
50°
18
66°
50°
19
65°
51°
20
66°
53°
21
66°
51°
22
65°
53°
23
66°
53°
24
66°
52°
25
64°
51°
26
62°
47°
27
61°
49°
28
61°
51°
29
62°
50°
30
61°
50°
31
60°
49°
1
60°
49°
2
61°
50°
3
60°
50°
4
60°
47°
5
62°
46°
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 60° to 67°, with overnight lows between 46° and 55°. The average high for August is 64° with an average low of 52°. 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.
