S
M
T
W
T
F
S
26
70°
49°
27
67°
44°
28
56°
39°
29
57°
40°
30
54°
35°
1
54°
34°
2
63°
29°
3
72°
46°
4
72°
44°
5
55°
34°
6
52°
30°
7
62°
31°
8
74°
33°
9
65°
41°
10
69°
32°
11
69°
30°
12
79°
54°
13
74°
43°
14
78°
44°
15
90°
50°
16
80°
53°
17
74°
60°
18
68°
60°
19
65°
41°
20
58°
35°
21
57°
49°
22
64°
48°
23
70°
50°
24
82°
47°
25
86°
59°
26
88°
62°
27
86°
60°
28
85°
62°
29
82°
61°
30
81°
63°
31
69°
58°
1
79°
55°
2
82°
54°
3
82°
60°
4
77°
62°
5
82°
63°
6
81°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Rock Falls
Rock Falls's May 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 54° and 63°. The average high for May is 79° with an average low of 59°. 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 Falls. See also: June | July | August.
