National Weather Service Forecast for: Altadena CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 6:16 pm PST Dec 22, 2025
 
Tonight

Tonight: Mostly cloudy, with a low around 52. Calm wind.
Mostly Cloudy
 Tuesday

Tuesday: Rain, mainly after 4pm. High near 62. South southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Chance Rain
then 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 54. Breezy, with a southeast wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
Heavy Rain
and Breezy
 Wednesday

Wednesday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 61. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts in excess of 4 inches possible.
Heavy Rain
 Wednesday
Night
Wednesday Night: Showers. Low around 52. South southeast wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Showers
 Christmas
Day
Christmas Day: Showers. High near 60. Chance of precipitation is 90%.
Showers
 Thursday
Night
Thursday Night: Showers. Low around 51. Chance of precipitation is 100%.
Showers
 Friday

Friday: Showers. Cloudy, with a high near 57.
Showers
 Friday
Night
Friday Night: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 44.
Showers
Likely
Lo 52 °F Hi 62 °F Lo 54 °F Hi 61 °F Lo 52 °F Hi 60 °F Lo 51 °F Hi 57 °F Lo 44 °F

Flood Watch
Wind Advisory
 

Tonight
 
 Mostly cloudy, with a low around 52. Calm wind.
Tuesday
 
 Rain, mainly after 4pm. High near 62. South southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter 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 54. Breezy, with a southeast wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
Wednesday
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 61. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts in excess of 4 inches possible.
Wednesday Night
 
 Showers. Low around 52. South southeast wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Christmas Day
 
 Showers. High near 60. Chance of precipitation is 90%.
Thursday Night
 
 Showers. Low around 51. Chance of precipitation is 100%.
Friday
 
 Showers. Cloudy, with a high near 57.
Friday Night
 
 Showers likely, mainly before 10pm. Mostly cloudy, with a low around 44.
Saturday
 
 A chance of showers, mainly before 4pm. Mostly sunny, with a high near 58.
Saturday Night
 
 A slight chance of showers. Mostly clear, with a low around 44.
Sunday
 
 Sunny, with a high near 61.
Sunday Night
 
 Mostly clear, with a low around 46.
Monday
 
 A slight chance of showers. Mostly sunny, with a high near 63.

 

Forecast from NOAA-NWS for Altadena CA.