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

Heavy Rain and Mountain Snow Lingers in California; Winter Storm Impacting the Great Lakes and Northeast U.S.

An atmospheric river will wind down through today across California with lingering heavy rainfall, heavy mountain snow, and gusty winds. A wintry mix of freezing rain, sleet, and snow will cause hazardous travel conditions for the Great Lakes into the northern Mid-Atlantic and southern New England today through Saturday morning. Areas of tree damage and power outages are possible. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

NA

36°F

2°C

Humidity 100%
Wind Speed WNW 13 MPH
Barometer NA
Dewpoint 36°F (2°C)
Visibility NA
Wind Chill27°F (-3°C)
Last update 27 Dec 01:20 AM PST
Extended Forecast for

7 Miles SSW Brentwood CA

  • Overnight

    Overnight: A 20 percent chance of rain. Partly cloudy, with a low around 44. West wind around 9 mph.

    Low: 44 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 47. West wind around 6 mph becoming north in the afternoon.

    High: 47 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 39. West wind around 6 mph.

    Low: 39 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 46. North wind around 6 mph.

    High: 46 °F

    Sunny

  • Sunday Night

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

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 48.

    High: 48 °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 49.

    High: 49 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 38 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of rain. Partly cloudy, with a low around 44. West wind around 9 mph.
Saturday
Mostly sunny, with a high near 47. West wind around 6 mph becoming north in the afternoon.
Saturday Night
Partly cloudy, with a low around 39. West wind around 6 mph.
Sunday
Sunny, with a high near 46. North wind around 6 mph.
Sunday Night
Mostly clear, with a low around 38. Light north northeast wind.
Monday
Sunny, with a high near 48.
Monday Night
Mostly clear, with a low around 38.
Tuesday
Mostly sunny, with a high near 49.
Tuesday Night
Mostly clear, with a low around 38.
Wednesday
Mostly sunny, with a high near 48.
Wednesday Night
A slight chance of rain. Mostly cloudy, with a low around 41.
New Year's Day
A chance of rain. Cloudy, with a high near 48.
Thursday Night
A chance of rain. Cloudy, with a low around 44.
Friday
A chance of rain. Partly sunny, with a high near 51.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
7 Miles SSW Brentwood CA
 37.83°N 121.74°W (Elev. 932 ft)
Last Update:
12:27 am PST Dec 27, 2025
Forecast Valid:
1am PST Dec 27, 2025-6pm PST Jan 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation