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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Crystal Lake, IL
Content continues below
August
Average Temperature
High
27°
Feels 28
Low
16°
Feels 16
Average Precipitation
11 Days
Rain amount
79.1mm
Snow amount
0cm
Content continues below
Daily Historical Averages
August 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
25°
7
29°
8
27°
9
28°
10
28°
11
26°
12
26°
13
26°
14
24°
15
25°
16
25°
17
25°
18
24°
19
25°
20
25°
21
22
23
24
25
26
27
28
29
30
31
Forecast
Thursday, August 6, 2026
Day
25°
Feels 25
Wind
10 km/h E
Gust
15 km/h
Humidity
74%
P.O.P
40%
Rain
<1 mm
Night
19°
Feels 19
Wind
13 km/h E
Gust
20 km/h
Humidity
100%
P.O.P
40%
Rain
<1 mm
Historical Averages
Aug 6
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.