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
77°
46°
5
60°
38°
6
55°
39°
7
55°
43°
8
63°
40°
9
68°
46°
10
64°
42°
11
65°
44°
12
63°
46°
13
68°
50°
14
65°
46°
15
70°
51°
16
70°
52°
17
73°
48°
18
67°
50°
19
72°
54°
20
71°
54°
21
69°
45°
22
66°
44°
23
66°
47°
24
68°
46°
25
68°
47°
26
69°
48°
27
68°
48°
28
69°
49°
29
69°
53°
30
71°
58°
31
77°
54°
1
71°
54°
2
75°
59°
3
77°
59°
4
80°
60°
5
80°
61°
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 55° to 81°, with overnight lows between 38° and 62°. The average high for May is 69° with an average low of 50°. 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.
