S
M
T
W
T
F
S
26
71°
51°
27
61°
45°
28
60°
43°
29
55°
36°
30
49°
32°
1
54°
34°
2
63°
47°
3
67°
47°
4
69°
37°
5
53°
32°
6
51°
33°
7
55°
35°
8
66°
40°
9
68°
41°
10
65°
41°
11
64°
45°
12
66°
45°
13
65°
44°
14
70°
45°
15
63°
43°
16
64°
44°
17
63°
50°
18
66°
49°
19
74°
51°
20
75°
52°
21
71°
47°
22
62°
43°
23
64°
42°
24
64°
43°
25
65°
47°
26
65°
49°
27
66°
48°
28
67°
46°
29
68°
50°
30
72°
47°
31
68°
48°
1
68°
51°
2
70°
49°
3
68°
50°
4
70°
49°
5
70°
48°
6
71°
50°
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 51° to 75°, with overnight lows between 32° and 52°. The average high for May is 66° with an average low of 45°. 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.
