Monthly Historical AveragesSullivan, IL
Average Temperature
High
18°
Feels 18
Low
7°
Feels 4
Average Precipitation
10 Days
95.6mm
0.1cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastThursday, April 9, 2026
Day
24°Feels 24
Wind
27 km/h SW
Gust
41 km/h
Humidity
39%
P.O.P
30%
Night
16°Feels 15
Wind
25 km/h SW
Gust
37 km/h
Humidity
70%
P.O.P
30%
Historical AveragesApr 9
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity