S
M
T
W
T
F
S
26
85°
59°
27
83°
64°
28
82°
66°
29
73°
62°
30
74°
60°
31
80°
61°
1
84°
65°
2
80°
65°
3
78°
61°
4
81°
62°
5
84°
63°
6
82°
62°
7
79°
63°
8
82°
64°
9
83°
68°
10
79°
62°
11
79°
62°
12
80°
61°
13
80°
62°
14
79°
61°
15
76°
60°
16
77°
60°
17
80°
61°
18
79°
60°
19
75°
60°
20
76°
58°
21
74°
57°
22
76°
60°
23
77°
55°
24
77°
51°
25
69°
52°
26
71°
58°
27
74°
59°
28
77°
59°
29
78°
58°
30
72°
50°
31
69°
50°
1
68°
51°
2
67°
50°
3
67°
48°
4
68°
48°
5
72°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Napierville
Napierville's August 2026 forecast shows daily high temperatures ranging from 67° to 84°, with overnight lows between 48° and 68°. The average high for August is 77° with an average low of 59°. 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 Napierville. See also: September | October | November.
