S
M
T
W
T
F
S
26
92°
73°
27
96°
75°
28
87°
67°
29
86°
62°
30
83°
57°
31
79°
67°
1
71°
67°
2
82°
63°
3
84°
59°
4
88°
62°
5
76°
69°
6
81°
69°
7
85°
65°
8
83°
63°
9
86°
63°
10
90°
74°
11
86°
70°
12
82°
71°
13
78°
69°
14
82°
73°
15
87°
72°
16
86°
67°
17
80°
62°
18
80°
63°
19
83°
64°
20
82°
65°
21
84°
64°
22
83°
62°
23
79°
63°
24
77°
60°
25
82°
62°
26
85°
68°
27
85°
67°
28
76°
58°
29
77°
62°
30
83°
66°
31
85°
66°
1
85°
65°
2
84°
66°
3
85°
65°
4
84°
64°
5
84°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rock Island
Rock Island's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 58° and 73°. The average high for August is 82° with an average low of 65°. 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 Island. See also: September | October | November.
