Monthly Historical AveragesGrafton, IL
Average Temperature
High
19°
Feels 19
Low
8°
Feels 6
Average Precipitation
11 Days
127mm
0.1cm
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Daily Historical Averages
S
M
T
W
T
F
S
ForecastSaturday, April 18, 2026
Day
13°Feels 11
Wind
28 km/h NW
Gust
42 km/h
Humidity
40%
P.O.P
60%
Rain
1-3 mm
Night
4°Feels 2
Wind
22 km/h NW
Gust
33 km/h
Humidity
75%
P.O.P
0%
Historical AveragesApr 18
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity