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

Winter Storm Bringing Widespread Hazardous Weather to the Eastern U.S.

A rapidly-intensifying winter storm continues to bring heavy snow, high winds, and blizzard conditions over the Upper Midwest and Great Lakes through today. An Arctic front will lead in a period of gusty to high winds and sharply colder temperatures over the entire eastern U.S. Heavy lake effect snow is then expected from Lakes Erie and Ontario through New Year's Day. Read More >

Hazardous Weather Conditions

Current conditions at

San Jose / Reid / Hillv (KRHV)

Lat: 37.33333°NLon: 121.81667°WElev: 135.0ft.

Clear

45°F

7°C

Humidity 70%
Wind Speed NA 4 MPH
Barometer 30.27 in (1025.06 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 28 Dec 09:50 PM PST
Extended Forecast for

Mount Hamilton CA

Cold Weather Advisory until December 29, 09:00am
Click here for hazard details and duration
Cold Weather Advisory
  •  
    Cold Weather Advisory until December 29, 09:00am

    NOW until 9:00am Mon

    Cold Weather Advisory

  • Overnight

    Low: 42 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 56. East southeast wind around 6 mph becoming light and variable in the afternoon.

    High: 56 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 42. East northeast wind 3 to 6 mph.

    Low: 42 °F

    Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. East northeast wind around 6 mph.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 46. East northeast wind 3 to 6 mph.

    Low: 46 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of rain, mainly after 10am. Partly sunny, with a high near 53. New precipitation amounts of less than a tenth of an inch possible.

    High: 53 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.

    Low: 46 °F

    Rain Likely

  • New Year's Day

    New Year's Day: Rain likely. Mostly cloudy, with a high near 52.

    High: 52 °F

    Rain Likely

Detailed Forecast

Overnight
Clear, with a steady temperature around 42. East wind around 6 mph.
Monday
Sunny, with a high near 56. East southeast wind around 6 mph becoming light and variable in the afternoon.
Monday Night
Clear, with a low around 42. East northeast wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 58. East northeast wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 46. East northeast wind 3 to 6 mph.
Wednesday
A 40 percent chance of rain, mainly after 10am. Partly sunny, with a high near 53. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.
New Year's Day
Rain likely. Mostly cloudy, with a high near 52.
Thursday Night
Rain likely. Mostly cloudy, with a low around 48.
Friday
Rain likely. Mostly cloudy, with a high near 53.
Friday Night
Rain likely. Mostly cloudy, with a low around 45.
Saturday
Rain likely. Mostly cloudy, with a high near 51.
Saturday Night
Rain likely. Mostly cloudy, with a low around 44.
Sunday
A chance of rain. Partly sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Hamilton CA
 37.35°N 121.64°W (Elev. 2398 ft)
Last Update:
12:27 am PST Dec 29, 2025
Forecast Valid:
5am PST Dec 29, 2025-6pm PST Jan 4, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation