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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Winthrop Harbor, IL
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May
Average Temperature
High
17°
Feels 17
Low
9°
Feels 7
Average Precipitation
12 Days
Rain amount
84.9mm
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
19°
16
22°
17
18°
18
21°
19
22°
20
14°
21
14°
22
17°
23
15°
24
16°
25
16°
26
16°
27
17°
28
18°
29
18°
30
31
Forecast
Friday, May 15, 2026
Day
19°
Feels 19
Wind
29 km/h S
Gust
44 km/h
Humidity
56%
P.O.P
30%
Night
14°
Feels 12
Wind
32 km/h S
Gust
48 km/h
Humidity
94%
P.O.P
80%
Rain
~5 mm
Historical Averages
May 15
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.