S
M
T
W
T
F
S
26
90°
71°
27
87°
70°
28
86°
68°
29
88°
71°
30
92°
72°
31
91°
71°
1
87°
71°
2
87°
70°
3
92°
63°
4
86°
64°
5
86°
64°
6
85°
65°
7
86°
64°
8
87°
63°
9
86°
64°
10
86°
65°
11
88°
69°
12
89°
68°
13
92°
64°
14
85°
65°
15
84°
68°
16
85°
66°
17
87°
62°
18
85°
63°
19
85°
61°
20
86°
62°
21
86°
66°
22
89°
69°
23
91°
68°
24
91°
68°
25
90°
67°
26
91°
66°
27
90°
67°
28
89°
66°
29
87°
63°
30
88°
59°
31
83°
57°
1
82°
57°
2
81°
59°
3
82°
61°
4
83°
61°
5
88°
60°
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 81° to 92°, with overnight lows between 57° and 72°. The average high for August is 87° with an average low of 65°. 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.
