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

Hazardous Weather Conditions

Current conditions at

ACTON (ATNC1)

Lat: 34.44639°NLon: 118.1968°WElev: 2600.0ft.

NA

53°F

12°C

Humidity 52%
Wind Speed SE 4 MPH
Barometer NA
Dewpoint 36°F (2°C)
Visibility NA
Last update 20 Apr 10:54 PM PDT
Extended Forecast for

9 Miles NNW Altadena CA

Wind Advisory April 21, 10:00am until April 21, 10:00pm
Click here for hazard details and duration
Wind Advisory

  • Tonight

    Tonight: Partly cloudy, with a low around 45. South southwest wind around 10 mph.

    Low: 45 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Rain likely after 11am. Mostly cloudy, with a high near 59. Breezy, with a south southwest wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 59 °F

    Rain Likely
    and Breezy

  • Tuesday Night

    Tuesday Night: Rain likely before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 40. Breezy, with a west southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Rain Likely
    and Breezy
    then Partly
    Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 60. West northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 60 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 41. North northwest wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 45. South southwest wind around 10 mph.
Tuesday
Rain likely after 11am. Mostly cloudy, with a high near 59. Breezy, with a south southwest wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
Rain likely before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 40. Breezy, with a west southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Sunny, with a high near 60. West northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 41. North northwest wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 65.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 63.
Friday Night
Partly cloudy, with a low around 45.
Saturday
A slight chance of rain. Partly sunny, with a high near 56. Breezy.
Saturday Night
Mostly cloudy, with a low around 42. Breezy.
Sunday
Mostly sunny, with a high near 57. Breezy.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
9 Miles NNW Altadena CA
 34.31°N 118.19°W (Elev. 4052 ft)
Last Update:
10:01 pm PDT Apr 20, 2026
Forecast Valid:
11pm PDT Apr 20, 2026-6pm PDT Apr 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation