National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

CHILAO (CHOC1)

Lat: 34.33167°NLon: 118.03028°WElev: 5450.0ft.

NA

75°F

24°C

Humidity 22%
Wind Speed WNW 0 MPH
Barometer NA
Dewpoint 34°F (1°C)
Visibility NA
Last update 31 Aug 11:53 PM PDT
Extended Forecast for

Altadena CA

Heat Advisory September 1, 12:45am until September 2, 06:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 1, 12:45am until September 2, 06:00pm

    NOW until 6:00pm Tue

    Heat Advisory

  • Overnight

    Low: 70 °F

    Clear

  • Labor Day

    Labor Day: Sunny and hot, with a high near 99. Calm wind becoming south around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after 11pm. Partly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 11am. Mostly sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 98 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

Overnight
Clear, with a low around 70. Calm wind.
Labor Day
Sunny and hot, with a high near 99. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
A 20 percent chance of showers and thunderstorms after 11pm. Partly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Tuesday
A 20 percent chance of showers and thunderstorms before 11am. Mostly sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind becoming south southwest around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 95.
Wednesday Night
Mostly clear, with a low around 69.
Thursday
Sunny, with a high near 88.
Thursday Night
Clear, with a low around 66.
Friday
Sunny, with a high near 86.
Friday Night
Clear, with a low around 65.
Saturday
Sunny, with a high near 84.
Saturday Night
Clear, with a low around 65.
Sunday
Sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Altadena CA
 34.21°N 118.14°W (Elev. 1663 ft)
Last Update:
9:04 pm PDT Aug 31, 2025
Forecast Valid:
12am PDT Sep 1, 2025-6pm PDT Sep 7, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation