Diamond Bar, CA Weather Forecast and Current Conditions

WEATHER ALERTS - Air Quality Alert

Current Conditions From Nearby Local Station

Clear with Mist and Fog 56°F
Feels Like 56°F  
Humidity 84% Dew Point 52°F Wind SE 2 MPH Gusts 5 Barometer N/A
Report from a MADIS/MESONET weather station 1.1 mi. ESE of central Diamond Bar
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Point Forecast at a Glance

WedDec 17
Wed Dec 17: Mostly Clear, Low 54F
 
54
ThuDec 18
Thu Dec 18: Sunny, High 81F, Low 55F
81
55
FriDec 19
Fri Dec 19: Sunny, High 79F, Low 52F
79
52
SatDec 20
Sat Dec 20: Sunny, High 71F, Low 52F
71
52
SunDec 21
Sun Dec 21: Partly Sunny, High 72F, Low 52F
72
52
MonDec 22
Mon Dec 22: Partly Sunny, High 70F, Low 51F
70
51
TueDec 23
Tue Dec 23: Showers, High 66F, Low 52F
50%
66
52

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7-Day Temperature Trend

Week Ahead Summary

Cooling trend continues with high temperatures dropping from 81°F to 66°F. Mostly dry conditions with only one day showing rain chances.

Climate Context

This week's forecast shows temperatures running 6°F above the historical average for December. Normal highs for this period are around 66°F with lows around 43°F.

This Date in Weather History

1983 - Record cold hit the north central states. At Havre, MT, the mercury plunged to a record reading of 34 degrees below zero.

More on this and other weather history

Diamond Bar, CA 7 Day Weather Forecast Details

Wednesday Dec 17

Mostly Clear

Night: Mostly clear, with a low around 54. East northeast wind 5 to 10 mph.

Thursday Dec 18

Sunny

Day: Sunny, with a high near 81. East northeast wind around 5 mph becoming west in the afternoon.

Clear

Night: Clear, with a low around 55. Northwest wind around 5 mph becoming northeast in the evening.

Friday Dec 19

Sunny

Day: Sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon.

Clear

Night: Clear, with a low around 52. East wind around 5 mph becoming calm.

Saturday Dec 20

Sunny

Day: Sunny, with a high near 71.

Partly Cloudy

Night: Partly cloudy, with a low around 52.

Sunday Dec 21

Partly Sunny

Day: Partly sunny, with a high near 72.

Mostly Cloudy

Night: Mostly cloudy, with a low around 52.

Monday Dec 22

Partly Sunny

Day: Partly sunny, with a high near 70.

Mostly Cloudy

Night: Mostly cloudy, with a low around 51.

Tuesday Dec 23

Showers

Day: A slight chance of showers. Partly sunny, with a high near 66.

Showers

Night: A chance of showers. Mostly cloudy, with a low around 52.

Wednesday Dec 24

Showers Likely

Day: Showers likely. Mostly cloudy, with a high near 63.


About Diamond Bar, CA

Diamond Bar is a city in eastern Los Angeles County, California, United States. The 2020 census listed a population of 55,072. It is one of a few cities in California with a majority Asian population (59.24% as of 2020). It is named after the "diamond over a bar" branding iron registered in 1918 by ranch owner Frederic E. Lewis (1884–1963). The city features a public Los Angeles County golf course. Located at the junction of the Pomona and Orange freeways, Diamond Bar is primarily residential with shopping centers interspersed throughout the city. It is surrounded by the cities of Brea, Walnut, Chino Hills, Pomona, City of Industry, and the unincorporated areas of Rowland Heights and South Diamond Bar. Northern Diamond Bar is a part of the Pomona Unified School District. Southern Diamond Bar is a part of the Walnut Valley Unified School District. The city is also served by International Polytechnic High School. It also has the first hydrogen fueling station to be built in Southern California, near the South Coast Air Quality Management District building.

Content from Wikipedia, licensed under CC BY-SA 3.0.

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Current conditions: We use the nearest available station to your location - including professional MESONET/MADIS and local weather stations - often miles closer than regional airports.

Forecasts: National Weather Service point forecasts predict for your specific area, not broad regional zones, making them far more relevant to your location.