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

Tracking Atmospheric River for the West Coast; Space Weather Storming Continues

An atmospheric river will bring threats of gusty to high winds and heavy rainfall to California mainly Thursday into Saturday which may bring areas of flooding and wind damage. Heavy snow will be possible over the Sierra Nevada mountains Thursday into Friday associated with the atmospheric river. Minor to severe geomagnetic storming (space weather) is expected to continue into early Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

San Jose / Reid / Hillv (KRHV)

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

Mostly Cloudy

66°F

19°C

Humidity 63%
Wind Speed SSE 5 MPH
Barometer 29.92 in (1013.21 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 12 Nov 09:47 PM PST
Extended Forecast for

Mount Hamilton CA

Wind Advisory until November 13, 04:00pm
Click here for hazard details and duration
Wind Advisory
  •  
    Wind Advisory until November 13, 04:00pm

    NOW until 4:00pm Thu

    Wind Advisory

  • Overnight

    Low: 52 °F

    Rain

  • Thursday

    Thursday: Rain before 7am, then showers and possibly a thunderstorm between 7am and 4pm, then rain likely and possibly a thunderstorm after 4pm. Some of the storms could produce heavy rainfall. Temperature falling to around 50 by 4pm. Windy, with a south wind 21 to 30 mph, with gusts as high as 50 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    High: 57 °F⇓

    Heavy Rain
    and Windy

  • Thursday Night

    Thursday Night: Rain likely. Mostly cloudy, with a low around 47. South wind 10 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Rain Likely

  • Friday

    Friday: A 50 percent chance of rain. Partly sunny, with a high near 52. Southeast wind around 6 mph becoming southwest in the morning. New precipitation amounts of less than a tenth of an inch possible.

    High: 52 °F

    Chance Rain

  • Friday Night

    Friday Night: A 20 percent chance of rain. Partly cloudy, with a low around 47. Light north wind. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 47 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: A 40 percent chance of rain. Partly sunny, with a high near 52. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance Rain

  • Sunday

    Sunday: A chance of rain. Mostly cloudy, with a high near 52.

    High: 52 °F

    Chance Rain

Detailed Forecast

Overnight
Rain, mainly after 4am. Low around 52. South wind 18 to 21 mph, with gusts as high as 39 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
Rain before 7am, then showers and possibly a thunderstorm between 7am and 4pm, then rain likely and possibly a thunderstorm after 4pm. Some of the storms could produce heavy rainfall. Temperature falling to around 50 by 4pm. Windy, with a south wind 21 to 30 mph, with gusts as high as 50 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Thursday Night
Rain likely. Mostly cloudy, with a low around 47. South wind 10 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Friday
A 50 percent chance of rain. Partly sunny, with a high near 52. Southeast wind around 6 mph becoming southwest in the morning. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A 20 percent chance of rain. Partly cloudy, with a low around 47. Light north wind. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A 40 percent chance of rain. Partly sunny, with a high near 52. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 48.
Sunday
A chance of rain. Mostly cloudy, with a high near 52.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 44.
Monday
A chance of rain, mainly before 4pm. Partly sunny, with a high near 47.
Monday Night
A slight chance of rain. Mostly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Mostly clear, with a low around 41.
Wednesday
A slight chance of rain. Mostly sunny, with a high near 50.
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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:
12:26 am PST Nov 13, 2025
Forecast Valid:
1am PST Nov 13, 2025-6pm PST Nov 19, 2025
 
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