S
M
T
W
T
F
S
26
67°
56°
27
70°
53°
28
68°
53°
29
70°
54°
30
72°
55°
31
71°
56°
1
70°
55°
2
68°
57°
3
68°
57°
4
69°
58°
5
68°
55°
6
68°
57°
7
69°
56°
8
68°
56°
9
68°
57°
10
67°
53°
11
68°
54°
12
67°
54°
13
69°
53°
14
68°
55°
15
71°
52°
16
71°
52°
17
72°
53°
18
72°
54°
19
71°
54°
20
72°
57°
21
72°
57°
22
71°
56°
23
72°
55°
24
71°
56°
25
71°
56°
26
70°
55°
27
70°
57°
28
71°
53°
29
66°
55°
30
68°
52°
31
68°
51°
1
67°
53°
2
69°
54°
3
67°
55°
4
67°
55°
5
64°
52°
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 64° to 72°, with overnight lows between 51° and 58°. The average high for August is 69° with an average low of 55°. 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.
