S
M
T
W
T
F
S
26
89°
66°
27
89°
68°
28
89°
68°
29
92°
64°
30
93°
69°
1
94°
71°
2
91°
69°
3
81°
63°
4
86°
63°
5
88°
67°
6
95°
68°
7
94°
71°
8
91°
71°
9
92°
71°
10
94°
73°
11
90°
67°
12
91°
66°
13
91°
66°
14
93°
70°
15
94°
71°
16
94°
69°
17
95°
71°
18
92°
69°
19
91°
67°
20
90°
70°
21
91°
69°
22
91°
71°
23
90°
71°
24
89°
70°
25
87°
71°
26
87°
71°
27
88°
70°
28
87°
71°
29
87°
71°
30
88°
72°
31
87°
72°
1
87°
71°
2
88°
73°
3
89°
71°
4
88°
72°
5
88°
73°
6
89°
72°
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 87° to 95°, with overnight lows between 66° and 73°. The average high for May is 90° with an average low of 70°. 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.
