S
M
T
W
T
F
S
26
84°
68°
27
80°
62°
28
81°
64°
29
83°
65°
30
82°
61°
31
82°
59°
1
80°
60°
2
79°
59°
3
80°
59°
4
79°
60°
5
79°
60°
6
80°
61°
7
80°
60°
8
81°
66°
9
83°
64°
10
85°
63°
11
85°
59°
12
84°
67°
13
88°
59°
14
82°
57°
15
79°
61°
16
79°
62°
17
81°
59°
18
79°
57°
19
78°
58°
20
78°
56°
21
79°
57°
22
76°
56°
23
77°
57°
24
78°
57°
25
79°
64°
26
78°
64°
27
83°
65°
28
86°
60°
29
86°
55°
30
78°
57°
31
78°
59°
1
76°
62°
2
76°
55°
3
77°
52°
4
75°
60°
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 52° and 68°. The average high for August is 80° 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 Rock Falls. See also: September | October | November.
