Hourly Weather Forecast - Diamond Bar, CA

12 AM
54°F
0%
3mph
ENE
Cloudy
Humidity
87%
Feels like
54°F
Dew Point
50°F
1 AM
54°F
0%
3mph
ENE
Cloudy
Humidity
87%
Feels like
54°F
Dew Point
50°F
2 AM
54°F
0%
3mph
ENE
Cloudy
Humidity
86%
Feels like
54°F
Dew Point
50°F

Rainfall and Snowfall Totals Through Thursday

Pineapple Express Slams Northwestern U.S.

The atmospheric river this week will keep buffeting the Pacific Northwest with heavy rain, snow, and high winds.

Wednesday's Weather Outlook

Today's Weather Outlook

How to Measure Snow via NWS

How To Measure Snow

Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

A person standing in a snowy forest with their back to the camera. They are bundled up in a white hat and a brown jacket. (Image by StockSnap from Pixabay)

Common Cold Weather Illnesses

A strong cold-air-damming event from March 20, 2018.

Cold Air Damming - Cause And Effects

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Today's National Outlook

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