S
M
T
W
T
F
S
26
88°
70°
27
85°
68°
28
85°
71°
29
86°
68°
30
90°
70°
1
90°
69°
2
96°
74°
3
81°
72°
4
80°
71°
5
85°
72°
6
89°
74°
7
89°
73°
8
88°
75°
9
88°
76°
10
88°
77°
11
87°
74°
12
89°
73°
13
90°
75°
14
87°
74°
15
88°
73°
16
87°
74°
17
89°
73°
18
83°
75°
19
84°
76°
20
84°
76°
21
85°
75°
22
85°
76°
23
86°
75°
24
84°
76°
25
84°
76°
26
85°
77°
27
87°
77°
28
85°
76°
29
84°
77°
30
84°
77°
31
85°
76°
1
84°
77°
2
85°
76°
3
85°
76°
4
86°
75°
5
85°
76°
6
85°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Rock Island
Rock Island's May 2026 forecast shows daily high temperatures ranging from 80° to 90°, with overnight lows between 71° and 77°. The average high for May is 86° with an average low of 75°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Rock Island. See also: June | July | August.
