S
M
T
W
T
F
S
26
98°
64°
27
97°
64°
28
96°
63°
29
97°
64°
30
97°
64°
31
96°
65°
1
95°
63°
2
96°
64°
3
96°
64°
4
95°
63°
5
95°
64°
6
92°
63°
7
93°
64°
8
96°
64°
9
94°
62°
10
93°
60°
11
89°
58°
12
88°
57°
13
88°
58°
14
89°
59°
15
90°
58°
16
89°
61°
17
91°
57°
18
92°
57°
19
92°
58°
20
91°
57°
21
91°
57°
22
92°
59°
23
90°
60°
24
91°
57°
25
91°
57°
26
90°
58°
27
91°
57°
28
90°
56°
29
89°
57°
30
90°
57°
31
94°
58°
1
93°
59°
2
90°
56°
3
89°
56°
4
88°
57°
5
89°
57°
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 88° to 98°, with overnight lows between 56° and 65°. The average high for August is 92° with an average low of 60°. 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.
