National Weather Service Forecast for: Altadena CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 1:36 am PST Dec 5, 2025
 
Overnight

Overnight: Clear, with a low around 47. North northeast wind around 5 mph.
Clear
 Friday

Friday: Sunny, with a high near 70. North northeast wind around 5 mph becoming south southwest in the afternoon.
Sunny
 Friday
Night
Friday Night: Clear, with a low around 49. East northeast wind around 5 mph becoming calm in the evening.
Clear
 Saturday

Saturday: Sunny, with a high near 69. South southwest wind around 5 mph.
Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 49. North northeast wind around 5 mph.
Mostly Clear
 Sunday

Sunday: Sunny, with a high near 73.
Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 52.
Mostly Clear
 Monday

Monday: Sunny, with a high near 76.
Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 55.
Mostly Clear
Lo 47 °F Hi 70 °F Lo 49 °F Hi 69 °F Lo 49 °F Hi 73 °F Lo 52 °F Hi 76 °F Lo 55 °F

 

Overnight
 
 Clear, with a low around 47. North northeast wind around 5 mph.
Friday
 
 Sunny, with a high near 70. North northeast wind around 5 mph becoming south southwest in the afternoon.
Friday Night
 
 Clear, with a low around 49. East northeast wind around 5 mph becoming calm in the evening.
Saturday
 
 Sunny, with a high near 69. South southwest wind around 5 mph.
Saturday Night
 
 Mostly clear, with a low around 49. North northeast wind around 5 mph.
Sunday
 
 Sunny, with a high near 73.
Sunday Night
 
 Mostly clear, with a low around 52.
Monday
 
 Sunny, with a high near 76.
Monday Night
 
 Mostly clear, with a low around 55.
Tuesday
 
 Sunny, with a high near 80.
Tuesday Night
 
 Mostly clear, with a low around 56.
Wednesday
 
 Sunny, with a high near 80.
Wednesday Night
 
 Mostly clear, with a low around 56.
Thursday
 
 Sunny, with a high near 80.

 

Forecast from NOAA-NWS for Altadena CA.