National Weather Service Forecast for: Altadena CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 5:58 am PDT Mar 19, 2026
 
This
Afternoon
This Afternoon: Sunny and hot, with a high near 97. South southwest wind 5 to 10 mph.
Hot
Tonight

Tonight: Clear, with a low around 73. Southwest wind around 5 mph becoming calm  in the evening.
Clear
Friday

Friday: Sunny and hot, with a high near 96. Light and variable wind becoming south southwest 5 to 10 mph in the afternoon.
Hot
Friday
Night
Friday Night: Clear, with a low around 70. Southwest wind 5 to 10 mph becoming light and variable  in the evening.
Clear
Saturday

Saturday: Sunny, with a high near 94. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Sunny
Saturday
Night
Saturday Night: Partly cloudy, with a low around 66.
Partly Cloudy
Sunday

Sunday: Mostly sunny, with a high near 90.
Mostly Sunny
Sunday
Night
Sunday Night: Clear, with a low around 66.
Clear
Monday

Monday: Sunny, with a high near 91.
Sunny
Hi 97 °F Lo 73 °F Hi 96 °F Lo 70 °F Hi 94 °F Lo 66 °F Hi 90 °F Lo 66 °F Hi 91 °F

Extreme Heat Warning
 

This Afternoon
 
Sunny and hot, with a high near 97. South southwest wind 5 to 10 mph.
Tonight
 
Clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Friday
 
Sunny and hot, with a high near 96. Light and variable wind becoming south southwest 5 to 10 mph in the afternoon.
Friday Night
 
Clear, with a low around 70. Southwest wind 5 to 10 mph becoming light and variable in the evening.
Saturday
 
Sunny, with a high near 94. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Saturday Night
 
Partly cloudy, with a low around 66.
Sunday
 
Mostly sunny, with a high near 90.
Sunday Night
 
Clear, with a low around 66.
Monday
 
Sunny, with a high near 91.
Monday Night
 
Clear, with a low around 66.
Tuesday
 
Sunny, with a high near 91.
Tuesday Night
 
Clear, with a low around 65.
Wednesday
 
Sunny, with a high near 89.

 

Forecast from NOAA-NWS for Altadena CA.