Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

NA

42°F

6°C

Humidity 95%
Wind Speed WSW 1 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 28 Dec 12:10 AM PST
Extended Forecast for

Cupertino CA

  • Overnight

    Overnight: Partly cloudy, with a low around 37. Calm wind.

    Low: 37 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 55. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 55 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 4am.  Otherwise, mostly clear, with a low around 36. North wind 3 to 5 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Monday

    Monday: Areas of frost before 8am.  Otherwise, sunny, with a high near 58. North northeast wind 3 to 5 mph.

    High: 58 °F

    Areas Frost
    then Sunny

  • Monday Night

    Monday Night: Clear, with a low around 39. Light east northeast wind.

    Low: 39 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of rain after 10am.  Partly sunny, with a high near 61.

    High: 61 °F

    Slight Chance
    Rain

  • Wednesday Night

    Wednesday Night: A chance of rain.  Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance Rain

Detailed Forecast

Overnight
Partly cloudy, with a low around 37. Calm wind.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 55. Calm wind becoming north northwest around 6 mph in the afternoon.
Sunday Night
Patchy frost after 4am. Otherwise, mostly clear, with a low around 36. North wind 3 to 5 mph.
Monday
Areas of frost before 8am. Otherwise, sunny, with a high near 58. North northeast wind 3 to 5 mph.
Monday Night
Clear, with a low around 39. Light east northeast wind.
Tuesday
Sunny, with a high near 61.
Tuesday Night
Partly cloudy, with a low around 42.
Wednesday
A slight chance of rain after 10am. Partly sunny, with a high near 61.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 46.
New Year's Day
Rain likely. Mostly cloudy, with a high near 61.
Thursday Night
Rain likely. Mostly cloudy, with a low around 47.
Friday
A chance of rain. Mostly cloudy, with a high near 58.
Friday Night
A chance of rain. Mostly cloudy, with a low around 46.
Saturday
A chance of rain. Mostly cloudy, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
Cupertino CA
 37.31°N 122.06°W (Elev. 610 ft)
12:27 am PST Dec 28, 2025
1am PST Dec 28, 2025-6pm PST Jan 3, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database