S
M
T
W
T
F
S
26
88°
72°
27
86°
75°
28
88°
75°
29
77°
64°
30
64°
59°
1
59°
54°
2
75°
48°
3
81°
48°
4
81°
55°
5
86°
68°
6
75°
57°
7
68°
52°
8
79°
59°
9
90°
70°
10
88°
64°
11
79°
63°
12
84°
55°
13
88°
55°
14
90°
61°
15
86°
68°
16
88°
70°
17
86°
75°
18
90°
77°
19
82°
64°
20
81°
64°
21
81°
66°
22
88°
68°
23
80°
67°
24
80°
66°
25
82°
67°
26
86°
70°
27
77°
67°
28
83°
68°
29
83°
66°
30
84°
67°
31
85°
66°
1
83°
64°
2
83°
64°
3
84°
63°
4
84°
65°
5
88°
67°
6
87°
70°
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 77° to 88°, with overnight lows between 63° and 70°. The average high for May is 83° with an average low of 66°. 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.
