National Weather Service Forecast for: Altadena CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 8:15 pm PDT Jun 19, 2026
 
Tonight

Tonight: Mostly clear early, then becoming cloudy, with a low around 59. South southwest wind around 5 mph becoming calm in the evening.
Becoming
Cloudy
 Saturday

Saturday: Cloudy through mid morning, then gradual clearing, with a high near 76. Light south southeast wind becoming south southwest 5 to 10 mph in the afternoon.
Gradual
Clearing
 Saturday
Night
Saturday Night: Increasing clouds, with a low around 60. South southwest wind 5 to 10 mph becoming light south southeast in the evening.
Increasing
Clouds
 Sunday

Sunday: Cloudy through mid morning, then gradual clearing, with a high near 77. Light south southeast wind becoming south southwest 5 to 10 mph in the afternoon.
Becoming
Sunny
 Sunday
Night
Sunday Night: Partly cloudy, with a low around 60. South southwest wind 5 to 10 mph.
Partly Cloudy
 Monday

Monday: Sunny, with a high near 83.
Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 57.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 88.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 60.
Mostly Clear
Lo 59 °F Hi 76 °F Lo 60 °F Hi 77 °F Lo 60 °F Hi 83 °F Lo 57 °F Hi 88 °F Lo 60 °F

Extreme Heat Watch
Air Quality Alert
 

Tonight
 
 Mostly clear early, then becoming cloudy, with a low around 59. South southwest wind around 5 mph becoming calm in the evening.
Saturday
 
 Cloudy through mid morning, then gradual clearing, with a high near 76. Light south southeast wind becoming south southwest 5 to 10 mph in the afternoon.
Saturday Night
 
 Increasing clouds, with a low around 60. South southwest wind 5 to 10 mph becoming light south southeast in the evening.
Sunday
 
 Cloudy through mid morning, then gradual clearing, with a high near 77. Light south southeast wind becoming south southwest 5 to 10 mph in the afternoon.
Sunday Night
 
 Partly cloudy, with a low around 60. South southwest wind 5 to 10 mph.
Monday
 
 Sunny, with a high near 83.
Monday Night
 
 Mostly clear, with a low around 57.
Tuesday
 
 Sunny, with a high near 88.
Tuesday Night
 
 Mostly clear, with a low around 60.
Wednesday
 
 Sunny, with a high near 90.
Wednesday Night
 
 A slight chance of showers. Mostly clear, with a low around 61.
Thursday
 
 Sunny, with a high near 91.
Thursday Night
 
 Mostly clear, with a low around 60.
Friday
 
 Sunny, with a high near 85.

 

Forecast from NOAA-NWS for Altadena CA.