Monthly Historical AveragesDiamond Bar, CA
Average Temperature
High
17°
Feels 17
Low
7°
Feels 5
Average Precipitation
6 Days
46.4mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastTuesday, December 30, 2025
Day
17°Feels 16
Wind
13 km/h E
Gust
20 km/h
Humidity
34%
P.O.P
30%
Night
14°Feels 14
Wind
19 km/h E
Gust
29 km/h
Humidity
58%
P.O.P
30%
Historical AveragesDec 30
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity