S
M
T
W
T
F
S
26
90°
72°
27
96°
74°
28
86°
63°
29
85°
57°
30
85°
55°
31
73°
63°
1
69°
64°
2
81°
61°
3
82°
55°
4
85°
60°
5
81°
64°
6
81°
63°
7
86°
65°
8
82°
61°
9
84°
65°
10
82°
66°
11
79°
65°
12
85°
64°
13
79°
62°
14
77°
62°
15
78°
59°
16
75°
57°
17
75°
61°
18
75°
59°
19
76°
58°
20
77°
61°
21
81°
60°
22
85°
65°
23
84°
65°
24
77°
63°
25
79°
64°
26
82°
64°
27
83°
63°
28
83°
62°
29
75°
59°
30
74°
58°
31
74°
58°
1
75°
59°
2
76°
62°
3
76°
62°
4
80°
63°
5
82°
62°
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 85°, with overnight lows between 57° and 66°. The average high for August is 79° with an average low of 62°. 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.
