S
M
T
W
T
F
S
26
81°
61°
27
81°
60°
28
82°
58°
29
81°
63°
30
83°
64°
31
86°
63°
1
84°
57°
2
81°
57°
3
81°
59°
4
80°
57°
5
80°
57°
6
81°
56°
7
81°
56°
8
82°
59°
9
80°
63°
10
80°
63°
11
81°
62°
12
81°
61°
13
83°
63°
14
86°
57°
15
85°
56°
16
80°
60°
17
83°
59°
18
84°
55°
19
80°
56°
20
79°
55°
21
80°
60°
22
80°
56°
23
79°
61°
24
80°
61°
25
79°
60°
26
84°
63°
27
84°
62°
28
83°
62°
29
85°
61°
30
85°
54°
31
78°
54°
1
78°
55°
2
79°
55°
3
78°
59°
4
77°
53°
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 77° to 86°, with overnight lows between 52° and 64°. The average high for August is 81° with an average low of 59°. 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.
