S
M
T
W
T
F
S
26
76°
57°
27
76°
58°
28
77°
58°
29
76°
57°
30
76°
57°
31
73°
56°
1
75°
56°
2
70°
55°
3
74°
57°
4
74°
57°
5
73°
56°
6
74°
58°
7
72°
53°
8
71°
51°
9
72°
51°
10
71°
56°
11
72°
56°
12
72°
51°
13
71°
50°
14
71°
56°
15
72°
50°
16
71°
53°
17
70°
51°
18
70°
53°
19
72°
51°
20
71°
50°
21
70°
55°
22
71°
51°
23
69°
50°
24
72°
50°
25
69°
49°
26
69°
50°
27
70°
54°
28
71°
54°
29
73°
53°
30
73°
54°
31
72°
52°
1
73°
54°
2
72°
52°
3
72°
50°
4
71°
52°
5
71°
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 69° to 77°, with overnight lows between 49° and 58°. The average high for August is 72° with an average low of 53°. 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.
