Monthly Historical AveragesSullivan, IL
Average Temperature
High
30°
Feels 32
Low
19°
Feels 19
Average Precipitation
11 Days
98.8mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastThursday, July 16, 2026
Day
31°Feels 36
Wind
7 km/h W
Gust
11 km/h
Humidity
60%
P.O.P
40%
Rain
<1 mm
Night
23°Feels 24
Wind
6 km/h SW
Gust
8 km/h
Humidity
96%
P.O.P
20%
Historical AveragesJul 16
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity