National Weather Service Forecast for: Diamond Bar CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 6:58 am PDT Jun 12, 2025
 
Today

Today: Patchy fog before 11am. Otherwise, cloudy early, then clearing, with a high near 81. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Patchy Fog
then Sunny
 Tonight

Tonight: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 61. South southwest wind 5 to 10 mph becoming light after midnight.
Patchy Fog
 Friday

Friday: Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. Light west southwest wind becoming southwest 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny
 Friday
Night
Friday Night: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 62. Southwest wind 5 to 10 mph becoming light west in the evening. Winds could gust as high as 15 mph.
Patchy Fog
 Saturday

Saturday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming southwest around 5 mph in the afternoon.
Patchy Fog
then Sunny
 Saturday
Night
Saturday Night: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 63.
Patchy Fog
 Sunday

Sunday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 87.
Patchy Fog
then Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 62.
Mostly Clear
 Monday

Monday: Sunny, with a high near 84.
Sunny
Hi 81 °F Lo 61 °F Hi 82 °F Lo 62 °F Hi 86 °F Lo 63 °F Hi 87 °F Lo 62 °F Hi 84 °F

 

Today
 
 Patchy fog before 11am. Otherwise, cloudy early, then clearing, with a high near 81. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
 
 Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 61. South southwest wind 5 to 10 mph becoming light after midnight.
Friday
 
 Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. Light west southwest wind becoming southwest 5 to 10 mph in the afternoon.
Friday Night
 
 Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 62. Southwest wind 5 to 10 mph becoming light west in the evening. Winds could gust as high as 15 mph.
Saturday
 
 Patchy fog before 11am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
 
 Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 63.
Sunday
 
 Patchy fog before 11am. Otherwise, mostly sunny, with a high near 87.
Sunday Night
 
 Mostly clear, with a low around 62.
Monday
 
 Sunny, with a high near 84.
Monday Night
 
 Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 60.
Tuesday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 82.
Tuesday Night
 
 Mostly clear, with a low around 62.
Wednesday
 
 Sunny, with a high near 86.

 

Forecast from NOAA-NWS for Diamond Bar CA.