S
M
T
W
T
F
S
26
102°
79°
27
99°
80°
28
96°
76°
29
90°
76°
30
84°
69°
31
77°
65°
1
85°
63°
2
85°
62°
3
87°
67°
4
76°
62°
5
76°
62°
6
78°
62°
7
89°
67°
8
81°
61°
9
89°
74°
10
90°
72°
11
92°
77°
12
91°
72°
13
86°
70°
14
83°
70°
15
86°
73°
16
81°
67°
17
83°
63°
18
85°
67°
19
80°
67°
20
83°
62°
21
84°
68°
22
85°
66°
23
74°
65°
24
80°
65°
25
84°
66°
26
86°
65°
27
84°
62°
28
85°
67°
29
90°
70°
30
89°
76°
31
88°
72°
1
93°
74°
2
96°
72°
3
94°
75°
4
94°
76°
5
92°
75°
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.
