Monthly Historical AveragesPost Oak, IL
Average Temperature
High
18°
Feels 17
Low
7°
Feels 5
Average Precipitation
10 Days
111.7mm
0.1cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastSaturday, April 4, 2026
Day
17°Feels 17
Wind
26 km/h W
Gust
39 km/h
Humidity
61%
P.O.P
100%
Rain
5-10 mm
Night
4°Feels 1
Wind
26 km/h W
Gust
40 km/h
Humidity
69%
P.O.P
30%
Historical AveragesApr 4
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity