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

Heavy Rain and Flooding Concerns in Hawaii; Severe Weather in the Plains

A storm system is expected to bring strong winds, widespread heavy rainfall, and flooding concerns to the Hawaiian Islands through the weekend. Strong to severe thunderstorms are forecast from the Southern Plains to the Mid-Missouri Valley this afternoon and evening. Large hail and strong winds are the primary threats. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

52°F

11°C

Humidity 78%
Wind Speed SSW 7 MPH
Barometer NA
Dewpoint 46°F (8°C)
Visibility NA
Last update 09 Apr 11:50 AM PDT
Extended Forecast for

Clayton CA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 69. West southwest wind 10 to 13 mph, with gusts as high as 21 mph.

    High: 69 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers, mainly between 2am and 5am. Mostly cloudy, with a low around 55. South southwest wind 5 to 11 mph, with gusts as high as 21 mph.

    Low: 55 °F

    Chance
    Showers

  • Friday

    Friday: Showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. High near 63. South southwest wind 6 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 63 °F

    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 54. Southwest wind 9 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 2pm. High near 59. South wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 59 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 49. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 49 °F

    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 11am. High near 55. Chance of precipitation is 90%.

    High: 55 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance Rain

  • Monday

    Monday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 69. West southwest wind 10 to 13 mph, with gusts as high as 21 mph.
Tonight
A 30 percent chance of showers, mainly between 2am and 5am. Mostly cloudy, with a low around 55. South southwest wind 5 to 11 mph, with gusts as high as 21 mph.
Friday
Showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. High near 63. South southwest wind 6 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and possibly a thunderstorm. Low around 54. Southwest wind 9 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers, with thunderstorms also possible after 2pm. High near 59. South wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm. Low around 49. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
Showers, with thunderstorms also possible after 11am. High near 55. Chance of precipitation is 90%.
Sunday Night
A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 60.
Monday Night
Mostly clear, with a low around 48.
Tuesday
Sunny, with a high near 64.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
Last Update:
1:26 pm PDT Apr 9, 2026
Forecast Valid:
2pm PDT Apr 9, 2026-6pm PDT Apr 15, 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