National Weather Service Forecast for: Westmont CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 1:21 pm PST Dec 22, 2025
 
This
Afternoon
This Afternoon: Partly sunny, with a high near 66. West southwest wind around 5 mph.
Partly Sunny
 Tonight

Tonight: Mostly cloudy, with a low around 56. Southwest wind around 5 mph becoming calm.
Mostly Cloudy
 Tuesday

Tuesday: A 30 percent chance of rain after 10am. Cloudy, with a high near 64. Southeast wind 5 to 15 mph, with gusts as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible.
Chance Rain
 Tuesday
Night
Tuesday Night: Rain before 10pm, then rain and possibly a thunderstorm between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Some of the storms could produce heavy rainfall. Low around 59. Breezy, with a south southeast wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain
and Breezy
 Wednesday

Wednesday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 64. Breezy, with a south wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain
and Breezy
 Wednesday
Night
Wednesday Night: Showers. Low around 56. Chance of precipitation is 90%.
Showers
 Christmas
Day
Christmas Day: Showers. High near 63. Chance of precipitation is 90%.
Showers
 Thursday
Night
Thursday Night: Showers. Cloudy, with a low around 55.
Showers
 Friday

Friday: Showers. Mostly cloudy, with a high near 60.
Showers
Hi 66 °F Lo 56 °F Hi 64 °F Lo 59 °F Hi 64 °F Lo 56 °F Hi 63 °F Lo 55 °F Hi 60 °F

Flood Watch
 

This Afternoon
 
 Partly sunny, with a high near 66. West southwest wind around 5 mph.
Tonight
 
 Mostly cloudy, with a low around 56. Southwest wind around 5 mph becoming calm.
Tuesday
 
 A 30 percent chance of rain after 10am. Cloudy, with a high near 64. Southeast wind 5 to 15 mph, with gusts as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 Rain before 10pm, then rain and possibly a thunderstorm between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Some of the storms could produce heavy rainfall. Low around 59. Breezy, with a south southeast wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Wednesday
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 64. Breezy, with a south wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Wednesday Night
 
 Showers. Low around 56. Chance of precipitation is 90%.
Christmas Day
 
 Showers. High near 63. Chance of precipitation is 90%.
Thursday Night
 
 Showers. Cloudy, with a low around 55.
Friday
 
 Showers. Mostly cloudy, with a high near 60.
Friday Night
 
 A chance of showers. Mostly cloudy, with a low around 48.
Saturday
 
 A slight chance of showers. Mostly sunny, with a high near 61.
Saturday Night
 
 Mostly clear, with a low around 48.
Sunday
 
 Sunny, with a high near 64.

 

Forecast from NOAA-NWS for Westmont CA.