S
M
T
W
T
F
S
26
81°
56°
27
82°
56°
28
79°
62°
29
77°
56°
30
82°
53°
31
86°
49°
1
84°
65°
2
69°
60°
3
77°
51°
4
80°
47°
5
83°
49°
6
82°
58°
7
78°
65°
8
83°
58°
9
80°
54°
10
79°
56°
11
79°
55°
12
78°
56°
13
77°
53°
14
75°
52°
15
71°
55°
16
72°
56°
17
74°
55°
18
75°
54°
19
77°
57°
20
76°
58°
21
78°
58°
22
77°
57°
23
75°
54°
24
71°
57°
25
72°
57°
26
77°
59°
27
77°
58°
28
76°
55°
29
69°
52°
30
68°
50°
31
68°
51°
1
69°
55°
2
71°
57°
3
72°
57°
4
73°
56°
5
74°
56°
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 79°, with overnight lows between 50° and 59°. The average high for August is 74° 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.
