S
M
T
W
T
F
S
26
83°
67°
27
84°
68°
28
86°
68°
29
87°
69°
30
87°
68°
31
86°
69°
1
86°
69°
2
87°
70°
3
86°
68°
4
85°
67°
5
86°
67°
6
87°
68°
7
86°
66°
8
80°
62°
9
79°
62°
10
80°
66°
11
86°
68°
12
86°
69°
13
88°
69°
14
87°
67°
15
85°
66°
16
83°
64°
17
80°
65°
18
82°
65°
19
86°
64°
20
85°
65°
21
86°
64°
22
85°
59°
23
79°
57°
24
77°
56°
25
77°
56°
26
78°
57°
27
79°
55°
28
79°
55°
29
80°
62°
30
79°
62°
31
79°
61°
1
83°
62°
2
84°
61°
3
83°
53°
4
76°
58°
5
75°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rock Falls
Rock Falls's August 2026 forecast shows daily high temperatures ranging from 75° to 88°, with overnight lows between 53° and 70°. The average high for August is 83° with an average low of 64°. 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 Rock Falls. See also: September | October | November.
