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7 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Grayslake, IL
Content continues below
May
Average Temperature
High
20°
Feels 20
Low
9°
Feels 8
Average Precipitation
12 Days
Rain amount
83.4mm
Snow amount
0cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
23°
20
14°
21
14°
22
15°
23
17°
24
21°
25
23°
26
24°
27
22°
28
23°
29
23°
30
23°
31
23°
Forecast
Tuesday, May 19, 2026
Day
23°
Feels 23
Wind
30 km/h SW
Gust
45 km/h
Humidity
64%
P.O.P
70%
Rain
1-3 mm
Night
10°
Feels 7
Wind
22 km/h NW
Gust
33 km/h
Humidity
72%
P.O.P
30%
Historical Averages
May 19
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.