National Weather Service Forecast for: Diamond Bar CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 1:17 pm PDT Apr 26, 2025
 
This
Afternoon
This Afternoon: Rain likely. Mostly cloudy, with a high near 60. Southwest wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely

 Tonight

Tonight: A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 47. South wind 5 to 10 mph, with gusts as high as 15 mph.
Slight Chance
T-storms then
Partly Cloudy
 Sunday

Sunday: Partly sunny, with a high near 61. South wind 5 to 10 mph becoming west southwest in the afternoon.
Partly Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 49. West southwest wind 5 to 10 mph becoming south southeast after midnight.
Partly Cloudy

 Monday

Monday: Mostly sunny, with a high near 69. Calm wind becoming southwest around 5 mph in the afternoon.
Mostly Sunny

 Monday
Night
Monday Night: Mostly clear, with a low around 50.
Mostly Clear

 Tuesday

Tuesday: Sunny, with a high near 76.
Sunny

 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 53.
Partly Cloudy

 Wednesday

Wednesday: Mostly sunny, with a high near 74.
Mostly Sunny
Hi 60 °F Lo 47 °F Hi 61 °F Lo 49 °F Hi 69 °F Lo 50 °F Hi 76 °F Lo 53 °F Hi 74 °F

 

This Afternoon
 
 Rain likely. Mostly cloudy, with a high near 60. Southwest wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
 
 A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 47. South wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
 
 Partly sunny, with a high near 61. South wind 5 to 10 mph becoming west southwest in the afternoon.
Sunday Night
 
 Partly cloudy, with a low around 49. West southwest wind 5 to 10 mph becoming south southeast after midnight.
Monday
 
 Mostly sunny, with a high near 69. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 50.
Tuesday
 
 Sunny, with a high near 76.
Tuesday Night
 
 Partly cloudy, with a low around 53.
Wednesday
 
 Mostly sunny, with a high near 74.
Wednesday Night
 
 Partly cloudy, with a low around 53.
Thursday
 
 Mostly sunny, with a high near 75.
Thursday Night
 
 Patchy fog. Otherwise, mostly cloudy, with a low around 53.
Friday
 
 Patchy fog. Otherwise, partly sunny, with a high near 71.

 

Forecast from NOAA-NWS for Diamond Bar CA.