Tropical Moisture Brings Heavy Rain to Southwest; Strong Coastal Low to Impact the East Coast

Deep tropical moisture surging into the Southwest U.S. will lead to widespread showers and thunderstorms capable of producing flash flooding the next several days. A strong coastal low will develop late Friday and is expected to bring flooding, high surf, dangerous rip currents, gusty winds and heavy rain to much of the U.S. East Coast through early next week. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

48°F

9°C

Humidity 92%
Wind Speed SW 12 MPH
Barometer NA
Dewpoint 46°F (8°C)
Visibility NA
Wind Chill43°F (6°C)
Last update 09 Oct 10:35 PM PDT
Extended Forecast for

Clayton CA

  • Tonight

    Tonight: Mostly clear, with a low around 54. South southwest wind around 6 mph.

    Low: 54 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 68. West southwest wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 68 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 53. West southwest wind 6 to 8 mph.

    Low: 53 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 66. West wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 66 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 51. West wind 5 to 10 mph, with gusts as high as 18 mph.

    Low: 51 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: A chance of rain, mainly after 11am.  Mostly cloudy, with a high near 62.

    High: 62 °F

    Chance Rain

  • Monday Night

    Monday Night: Rain likely, mainly after 11pm.  Mostly cloudy, with a low around 53.

    Low: 53 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 54. South southwest wind around 6 mph.
Friday
Sunny, with a high near 68. West southwest wind 6 to 10 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 53. West southwest wind 6 to 8 mph.
Saturday
Sunny, with a high near 66. West wind 6 to 11 mph, with gusts as high as 21 mph.
Saturday Night
Clear, with a low around 51. West wind 5 to 10 mph, with gusts as high as 18 mph.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 53.
Columbus Day
A chance of rain, mainly after 11am. Mostly cloudy, with a high near 62.
Monday Night
Rain likely, mainly after 11pm. Mostly cloudy, with a low around 53.
Tuesday
Rain likely, mainly before 11am. Mostly cloudy, with a high near 59.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 52.
Wednesday
A chance of rain. Partly sunny, with a high near 62.
Wednesday Night
A slight chance of rain. Partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 63.
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ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
2:27 pm PDT Oct 9, 2025
10pm PDT Oct 9, 2025-6pm PDT Oct 16, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database