Monthly Historical AveragesO'Fallon, IL
Average Temperature
High
19°
Feels 19
Low
8°
Feels 6
Average Precipitation
11 Days
125.3mm
0.1cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastSunday, April 5, 2026
Day
15°Feels 13
Wind
23 km/h NW
Gust
35 km/h
Humidity
44%
P.O.P
20%
Night
3°Feels 0
Wind
15 km/h W
Gust
22 km/h
Humidity
78%
P.O.P
0%
Historical AveragesApr 5
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity