S
M
T
W
T
F
S
26
78°
61°
27
80°
61°
28
81°
60°
29
80°
62°
30
81°
61°
31
80°
61°
1
78°
60°
2
74°
57°
3
74°
59°
4
75°
60°
5
76°
60°
6
77°
59°
7
80°
60°
8
80°
60°
9
79°
61°
10
80°
60°
11
80°
60°
12
79°
59°
13
80°
61°
14
83°
60°
15
83°
59°
16
79°
60°
17
80°
59°
18
80°
59°
19
79°
54°
20
79°
50°
21
71°
49°
22
70°
50°
23
72°
51°
24
74°
51°
25
71°
50°
26
71°
55°
27
72°
50°
28
71°
48°
29
70°
49°
30
70°
48°
31
69°
48°
1
68°
50°
2
70°
49°
3
69°
51°
4
70°
49°
5
69°
47°
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 68° to 83°, with overnight lows between 47° and 62°. The average high for August is 76° with an average low of 56°. 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.
