Monthly Historical AveragesRound Lake, IL
Average Temperature
High
21°
Feels 21
Low
9°
Feels 8
Average Precipitation
12 Days
78.1mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastFriday, May 15, 2026
Day
22°Feels 22
Wind
30 km/h S
Gust
45 km/h
Humidity
46%
P.O.P
30%
Night
16°Feels 15
Wind
25 km/h S
Gust
38 km/h
Humidity
94%
P.O.P
80%
Rain
~5 mm
Historical AveragesMay 15
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity