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

Heavy Lake Effect Snow Downwind of Lakes Erie and Ontario; Fire Weather Concerns in the Southern Plains and Southeast

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. There is increasing confidence in snow squalls causing bursts of snow & gusty winds on New Year's Eve. Elevated fire weather conditions will continue today over parts of the Southern Plains and across much of the Southeast U.S. Read More >

Hazardous Weather Conditions

Current conditions at

San Jose / Reid / Hillv (KRHV)

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

Partly Cloudy

36°F

2°C

Humidity 86%
Wind Speed N 0 MPH
Barometer 30.19 in (1022.35 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 30 Dec 06:55 AM PST
Extended Forecast for

Mount Hamilton CA

Cold Weather Advisory until December 30, 09:00am
Click here for hazard details and duration
...
  •  
    Cold Weather Advisory until December 30, 09:00am

    NOW until 9:00am Tue

    Cold Weather Advisory

  • Today

    High: 58 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 30 percent chance of rain after 4am. Mostly cloudy, with a steady temperature around 50. East wind around 8 mph.

    Low: 50 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday

    Wednesday: Rain, mainly after 10am. Temperature falling to around 48 by 10am. East southeast wind 8 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 53 °F⇓

    Rain

  • Wednesday Night

    Wednesday Night: Rain. Low around 47. South southeast wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Rain

  • New Year's Day

    New Year's Day: Rain. High near 54. South wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 54 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely. Cloudy, with a low around 50. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Rain Likely

  • Friday

    Friday: Rain. High near 52. Chance of precipitation is 80%.

    High: 52 °F

    Rain

  • Friday Night

    Friday Night: Rain. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Rain

Detailed Forecast

Today
Increasing clouds, with a high near 58. East southeast wind 3 to 8 mph.
Tonight
A 30 percent chance of rain after 4am. Mostly cloudy, with a steady temperature around 50. East wind around 8 mph.
Wednesday
Rain, mainly after 10am. Temperature falling to around 48 by 10am. East southeast wind 8 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain. Low around 47. South southeast wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
New Year's Day
Rain. High near 54. South wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain likely. Cloudy, with a low around 50. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain. High near 52. Chance of precipitation is 80%.
Friday Night
Rain. Mostly cloudy, with a low around 44.
Saturday
Rain likely. Mostly cloudy, with a high near 49.
Saturday Night
Rain likely, mainly before 10pm. Mostly cloudy, with a low around 42.
Sunday
A chance of rain. Partly sunny, with a high near 51.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 42.
Monday
A chance of rain. Partly sunny, with a high near 52.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Hamilton CA
 37.35°N 121.64°W (Elev. 2398 ft)
Last Update:
12:27 am PST Dec 30, 2025
Forecast Valid:
7am PST Dec 30, 2025-6pm PST Jan 5, 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