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

DIABLO GRANDE (DBLC1)

Lat: 37.32927°NLon: 121.29538°WElev: 1861.0ft.

NA

42°F

6°C

Humidity 87%
Wind Speed SW 2 MPH
Barometer NA
Dewpoint 38°F (3°C)
Visibility NA
Last update 27 Dec 07:00 AM PST
Extended Forecast for

20 Miles E Mount Hamilton CA

  • Today

    Today: Sunny, with a high near 50. West wind 6 to 10 mph becoming north in the afternoon.

    High: 50 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 37. Northwest wind around 7 mph.

    Low: 37 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 48. West northwest wind around 6 mph becoming northeast in the afternoon.

    High: 48 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38. Light northwest wind.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 50. Light and variable wind becoming east northeast around 6 mph in the morning.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Wednesday

    Wednesday: A slight chance of rain after 4pm.  Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny
    then Slight
    Chance Rain

Detailed Forecast

Today
Sunny, with a high near 50. West wind 6 to 10 mph becoming north in the afternoon.
Tonight
Mostly clear, with a low around 37. Northwest wind around 7 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 48. West northwest wind around 6 mph becoming northeast in the afternoon.
Sunday Night
Mostly clear, with a low around 38. Light northwest wind.
Monday
Sunny, with a high near 50. Light and variable wind becoming east northeast around 6 mph in the morning.
Monday Night
Mostly clear, with a low around 38.
Tuesday
Mostly sunny, with a high near 52.
Tuesday Night
Mostly clear, with a low around 40.
Wednesday
A slight chance of rain after 4pm. Mostly sunny, with a high near 53.
Wednesday Night
A chance of rain, mainly after 10pm. Mostly cloudy, with a low around 44.
New Year's Day
A chance of rain. Mostly cloudy, with a high near 52.
Thursday Night
Rain likely. Mostly cloudy, with a low around 45.
Friday
A chance of rain. Mostly cloudy, with a high near 51.
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ABOUT THIS FORECAST

 
Point Forecast:
20 Miles E Mount Hamilton CA
 37.38°N 121.28°W (Elev. 1401 ft)
1:21 am PST Dec 27, 2025
7am PST Dec 27, 2025-6pm PST Jan 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database