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Hourly
7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Westmont, IL
Content continues below
May
Average Temperature
High
21°
Feels 21
Low
10°
Feels 9
Average Precipitation
13 Days
Rain amount
91.3mm
Snow amount
0cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
30°
18
25°
19
25°
20
15°
21
15°
22
17°
23
21°
24
24°
25
25°
26
25°
27
25°
28
25°
29
25°
30
25°
31
24°
Forecast
Sunday, May 17, 2026
Day
30°
Feels 30
Wind
31 km/h S
Gust
47 km/h
Humidity
46%
P.O.P
40%
Rain
<1 mm
Night
22°
Feels 22
Wind
29 km/h S
Gust
44 km/h
Humidity
65%
P.O.P
30%
Historical Averages
May 17
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.