S
M
T
W
T
F
S
26
64°
42°
27
55°
49°
28
59°
42°
29
49°
37°
30
44°
28°
1
45°
23°
2
56°
38°
3
62°
41°
4
65°
33°
5
49°
27°
6
49°
29°
7
47°
28°
8
53°
32°
9
55°
35°
10
59°
34°
11
57°
39°
12
59°
38°
13
61°
38°
14
55°
32°
15
60°
40°
16
60°
39°
17
61°
47°
18
61°
48°
19
69°
48°
20
71°
49°
21
70°
45°
22
60°
44°
23
61°
40°
24
61°
40°
25
63°
44°
26
62°
47°
27
63°
50°
28
64°
45°
29
64°
45°
30
70°
46°
31
65°
46°
1
63°
47°
2
65°
46°
3
66°
45°
4
67°
45°
5
67°
46°
6
68°
47°
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 45° to 71°, with overnight lows between 23° and 50°. The average high for May is 61° with an average low of 41°. 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.
