S
M
T
W
T
F
S
26
85°
69°
27
81°
68°
28
81°
64°
29
82°
67°
30
84°
70°
31
86°
70°
1
84°
69°
2
82°
68°
3
88°
65°
4
82°
62°
5
82°
65°
6
83°
63°
7
82°
62°
8
81°
61°
9
81°
60°
10
82°
62°
11
83°
68°
12
87°
69°
13
87°
63°
14
84°
61°
15
81°
66°
16
81°
67°
17
84°
61°
18
81°
63°
19
81°
61°
20
82°
61°
21
83°
64°
22
86°
67°
23
87°
67°
24
86°
66°
25
87°
67°
26
88°
65°
27
87°
66°
28
86°
65°
29
86°
65°
30
83°
59°
31
80°
56°
1
78°
56°
2
78°
58°
3
79°
59°
4
78°
57°
5
79°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Belleville
Belleville's August 2026 forecast shows daily high temperatures ranging from 78° to 88°, with overnight lows between 56° and 70°. 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 Belleville. See also: September | October | November.
