Monthly Historical AveragesMount Prospect, IL
Average Temperature
High
21°
Feels 21
Low
10°
Feels 9
Average Precipitation
13 Days
98.5mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastMonday, May 18, 2026
Day
27°Feels 28
Wind
32 km/h S
Gust
48 km/h
Humidity
62%
P.O.P
100%
Rain
~10 mm
Night
21°Feels 21
Wind
28 km/h S
Gust
42 km/h
Humidity
88%
P.O.P
40%
Rain
<1 mm
Historical AveragesMay 18
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity