Monthly Historical AveragesHartland, WI
Average Temperature
High
20°
Feels 20
Low
8°
Feels 7
Average Precipitation
10 Days
60.8mm
0.1cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastMonday, May 18, 2026
Day
25°Feels 25
Wind
35 km/h SW
Gust
53 km/h
Humidity
58%
P.O.P
80%
Rain
~5 mm
Night
19°Feels 19
Wind
34 km/h S
Gust
51 km/h
Humidity
94%
P.O.P
70%
Rain
1-3 mm
Historical AveragesMay 18
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity