S
M
T
W
T
F
S
26
87°
67°
27
87°
67°
28
86°
66°
29
86°
66°
30
85°
64°
31
81°
60°
1
78°
65°
2
78°
65°
3
79°
63°
4
84°
66°
5
85°
67°
6
85°
65°
7
80°
61°
8
77°
63°
9
78°
63°
10
80°
64°
11
82°
65°
12
84°
65°
13
85°
66°
14
86°
65°
15
85°
66°
16
87°
59°
17
85°
56°
18
78°
54°
19
76°
54°
20
76°
55°
21
77°
55°
22
77°
56°
23
78°
55°
24
77°
57°
25
80°
60°
26
82°
56°
27
80°
55°
28
76°
54°
29
77°
58°
30
81°
62°
31
81°
53°
1
80°
53°
2
74°
52°
3
75°
57°
4
77°
61°
5
82°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Belvidere
Belvidere's August 2026 forecast shows daily high temperatures ranging from 74° to 87°, with overnight lows between 52° and 67°. The average high for August is 81° with an average low of 60°. 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 Belvidere. See also: September | October | November.
