S
M
T
W
T
F
S
26
76°
55°
27
77°
56°
28
74°
53°
29
76°
55°
30
76°
54°
31
77°
53°
1
78°
58°
2
79°
60°
3
75°
60°
4
76°
59°
5
77°
54°
6
77°
55°
7
80°
55°
8
79°
56°
9
77°
52°
10
76°
53°
11
79°
55°
12
80°
57°
13
74°
55°
14
73°
55°
15
74°
57°
16
73°
53°
17
73°
57°
18
80°
59°
19
81°
59°
20
81°
58°
21
82°
59°
22
81°
59°
23
80°
58°
24
79°
52°
25
73°
51°
26
70°
56°
27
73°
51°
28
72°
50°
29
73°
54°
30
76°
58°
31
77°
54°
1
77°
49°
2
70°
49°
3
72°
56°
4
Hist. Avg.
74°
51°
5
Hist. Avg.
74°
51°
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 70° to 82°, with overnight lows between 49° and 60°. The average high for August is 76° with an average low of 55°. 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.
