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
81°
64°
11
79°
58°
12
77°
57°
13
80°
59°
14
81°
56°
15
79°
53°
16
82°
59°
17
77°
55°
18
78°
52°
19
78°
48°
20
76°
47°
21
78°
45°
22
77°
56°
23
68°
54°
24
69°
54°
25
76°
53°
26
79°
50°
27
76°
57°
28
74°
48°
29
79°
47°
30
68°
63°
31
75°
64°
1
86°
67°
2
84°
65°
3
81°
62°
4
72°
58°
5
76°
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 ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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.
