S
M
T
W
T
F
S
26
89°
70°
27
84°
71°
28
81°
62°
29
80°
58°
30
84°
57°
31
78°
65°
1
72°
66°
2
77°
63°
3
83°
59°
4
84°
66°
5
79°
65°
6
79°
65°
7
85°
67°
8
85°
67°
9
87°
67°
10
86°
64°
11
85°
64°
12
79°
63°
13
82°
64°
14
84°
63°
15
79°
61°
16
83°
62°
17
82°
61°
18
87°
65°
19
86°
65°
20
82°
64°
21
85°
64°
22
86°
65°
23
86°
65°
24
83°
64°
25
81°
64°
26
84°
63°
27
81°
61°
28
78°
63°
29
82°
63°
30
83°
62°
31
83°
62°
1
84°
63°
2
79°
62°
3
81°
61°
4
81°
61°
5
82°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Naperville
Naperville's August 2026 forecast shows daily high temperatures ranging from 78° to 87°, with overnight lows between 60° and 67°. The average high for August is 83° with an average low of 64°. 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 Naperville. See also: September | October | November.
