Monthly Historical AveragesSullivan, IL
Average Temperature
High
24°
Feels 24
Low
13°
Feels 12
Average Precipitation
13 Days
105.4mm
0cm
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Daily Historical Averages
S
M
T
W
T
F
S
ForecastMonday, May 25, 2026
Day
25°Feels 25
Wind
15 km/h E
Gust
23 km/h
Humidity
41%
P.O.P
20%
Night
15°Feels 14
Wind
9 km/h E
Gust
14 km/h
Humidity
85%
P.O.P
20%
Historical AveragesMay 25
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity