S
M
T
W
T
F
S
26
63°
39°
27
67°
48°
28
62°
49°
29
58°
38°
30
57°
35°
1
52°
34°
2
57°
29°
3
68°
43°
4
80°
43°
5
58°
45°
6
58°
37°
7
61°
32°
8
67°
35°
9
74°
43°
10
65°
37°
11
58°
40°
12
70°
38°
13
63°
42°
14
68°
36°
15
75°
61°
16
82°
62°
17
84°
67°
18
77°
68°
19
75°
47°
20
66°
46°
21
65°
48°
22
74°
53°
23
80°
58°
24
76°
57°
25
77°
59°
26
74°
60°
27
75°
60°
28
76°
53°
29
75°
57°
30
70°
55°
31
70°
52°
1
71°
50°
2
70°
50°
3
71°
52°
4
74°
60°
5
81°
62°
6
81°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Crystal Lake
Crystal Lake's May 2026 forecast shows daily high temperatures ranging from 65° to 84°, with overnight lows between 46° and 68°. The average high for May is 75° with an average low of 56°. 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 Crystal Lake. See also: June | July | August.
