S
M
T
W
T
F
S
26
102°
74°
27
102°
76°
28
104°
74°
29
99°
75°
30
95°
74°
31
99°
78°
1
87°
71°
2
92°
67°
3
94°
66°
4
98°
71°
5
101°
72°
6
100°
69°
7
96°
69°
8
92°
71°
9
97°
70°
10
100°
77°
11
98°
80°
12
101°
79°
13
99°
79°
14
102°
77°
15
101°
73°
16
102°
73°
17
101°
72°
18
100°
71°
19
101°
73°
20
102°
72°
21
101°
71°
22
100°
69°
23
92°
67°
24
95°
72°
25
94°
71°
26
95°
71°
27
95°
72°
28
94°
72°
29
95°
71°
30
93°
70°
31
90°
70°
1
87°
69°
2
89°
69°
3
92°
68°
4
91°
69°
5
92°
68°
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 87° to 102°, with overnight lows between 67° and 80°. The average high for August is 96° with an average low of 72°. 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.
