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

Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

Hazardous Weather Conditions

Current conditions at

LAS TRAMPAS (LTRC1)

Lat: 37.83389°NLon: 122.06694°WElev: 1760.0ft.

NA

53°F

12°C

Humidity 100%
Wind Speed WSW 30 MPH
Barometer NA
Dewpoint 53°F (12°C)
Visibility NA
Last update 24 Dec 03:28 AM PST
Extended Forecast for

Walnut Creek CA

Flood Watch December 24, 03:54am until December 26, 10:00pm
Wind Advisory December 24, 03:54am until December 24, 08:00am
Flood Advisory December 24, 03:54am until December 24, 06:15am
Click here for hazard details and duration
Flood Watch
Wind Advisory
Flood Advisory
  •  
    Flood Watch December 24, 03:54am until December 26, 10:00pm
    Wind Advisory December 24, 03:54am until December 24, 08:00am
    Flood Advisory December 24, 03:54am until December 24, 06:15am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 53 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: Showers before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers and possibly a thunderstorm after 5pm. Some of the storms could be severe. High near 60. South southwest wind 5 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 60 °F

    Showers
    Likely then
    Severe
    Thunderstorms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Some of the storms could be severe. Low around 51. Breezy, with a south wind 14 to 22 mph, with gusts as high as 47 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 51 °F

    Severe
    Thunderstorms
    and Breezy

  • Christmas Day

    Christmas Day: Showers and possibly a thunderstorm. Some of the storms could be severe. High near 55. Breezy, with a south wind 17 to 22 mph, with gusts as high as 43 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 55 °F

    Severe
    Thunderstorms
    and Breezy
    then Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 48. South wind 11 to 14 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 48 °F

    Severe
    Thunderstorms

  • Friday

    Friday: Showers, with thunderstorms also possible after 4pm. High near 55. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 55 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 43. Chance of precipitation is 60%.

    Low: 43 °F

    Showers
    Likely and
    Patchy Fog

  • Saturday

    Saturday: A slight chance of showers before 10am. Areas of fog before 1pm. Otherwise, partly sunny, with a high near 53.

    High: 53 °F

    Slight Chance
    Showers and
    Areas Fog
    then Patchy
    Fog

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Low around 53. Breezy, with a south wind around 23 mph, with gusts as high as 43 mph. Chance of precipitation is 100%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers and possibly a thunderstorm after 5pm. Some of the storms could be severe. High near 60. South southwest wind 5 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Some of the storms could be severe. Low around 51. Breezy, with a south wind 14 to 22 mph, with gusts as high as 47 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Christmas Day
Showers and possibly a thunderstorm. Some of the storms could be severe. High near 55. Breezy, with a south wind 17 to 22 mph, with gusts as high as 43 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 48. South wind 11 to 14 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers, with thunderstorms also possible after 4pm. High near 55. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Saturday
A slight chance of showers before 10am. Areas of fog before 1pm. Otherwise, partly sunny, with a high near 53.
Saturday Night
Mostly clear, with a low around 38.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Patchy fog. Otherwise, mostly clear, with a low around 37.
Monday
Patchy fog. Otherwise, mostly sunny, with a high near 53.
Monday Night
Patchy fog. Otherwise, partly cloudy, with a low around 38.
Tuesday
Patchy fog. Otherwise, mostly sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Walnut Creek CA
 37.9°N 122.07°W (Elev. 203 ft)
Last Update:
1:25 am PST Dec 24, 2025
Forecast Valid:
3am PST Dec 24, 2025-6pm PST Dec 30, 2025
 
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