National Weather Service Forecast for: Diamond Bar CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 1:07 pm PST Feb 2, 2026
 
Tonight

Tonight: Clear, with a low around 54. Southwest wind around 5 mph becoming calm.
Clear
 Tuesday

Tuesday: Sunny, with a high near 84. East wind around 5 mph becoming west northwest in the morning.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 57. Northeast wind 5 to 10 mph.
Clear
 Wednesday

Wednesday: Sunny, with a high near 88. Northeast wind around 10 mph, with gusts as high as 15 mph.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 60. Northeast wind 5 to 10 mph.
Mostly Clear
 Thursday

Thursday: Mostly sunny, with a high near 86.
Mostly Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 56.
Mostly Cloudy
 Friday

Friday: Mostly sunny, with a high near 74.
Mostly Sunny
 Friday
Night
Friday Night: Partly cloudy, with a low around 53.
Partly Cloudy
Lo 54 °F Hi 84 °F Lo 57 °F Hi 88 °F Lo 60 °F Hi 86 °F Lo 56 °F Hi 74 °F Lo 53 °F

 

Tonight
 
 Clear, with a low around 54. Southwest wind around 5 mph becoming calm.
Tuesday
 
 Sunny, with a high near 84. East wind around 5 mph becoming west northwest in the morning.
Tuesday Night
 
 Clear, with a low around 57. Northeast wind 5 to 10 mph.
Wednesday
 
 Sunny, with a high near 88. Northeast wind around 10 mph, with gusts as high as 15 mph.
Wednesday Night
 
 Mostly clear, with a low around 60. Northeast wind 5 to 10 mph.
Thursday
 
 Mostly sunny, with a high near 86.
Thursday Night
 
 Mostly cloudy, with a low around 56.
Friday
 
 Mostly sunny, with a high near 74.
Friday Night
 
 Partly cloudy, with a low around 53.
Saturday
 
 Sunny, with a high near 73.
Saturday Night
 
 Mostly clear, with a low around 52.
Sunday
 
 Sunny, with a high near 76.
Sunday Night
 
 Mostly clear, with a low around 53.
Monday
 
 A chance of rain. Mostly sunny, with a high near 73.

 

Forecast from NOAA-NWS for Diamond Bar CA.