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 Thursday 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

55°F

13°C

Humidity 66%
Wind Speed SW 8 MPH
Barometer NA
Dewpoint 44°F (7°C)
Visibility NA
Last update 09 Apr 04:25 AM PDT
Extended Forecast for

4 Miles SSE Clayton CA

  • Today

    Today: A slight chance of rain between 2pm and 3pm. Mostly sunny, with a high near 60. Southwest wind 9 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 60 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Tonight

    Tonight: A slight chance of rain before 11pm, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 50. Southwest wind 8 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Slight Chance
    Rain then
    Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 54. Southwest wind 7 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 54 °F

    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 11pm, then rain likely after 11pm. Low around 50. South southwest wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Showers

  • Saturday

    Saturday: Rain likely, then showers and possibly a thunderstorm after 11am. High near 55. Breezy, with a south southwest wind 14 to 22 mph, with gusts as high as 38 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 55 °F

    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm, mainly before 2am, then rain likely after 2am. Low around 45. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 45 °F

    Showers

  • Sunday

    Sunday: Rain likely, then showers and possibly a thunderstorm after 11am. High near 49. Chance of precipitation is 80%.

    High: 49 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of rain before 11pm. Partly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain
    then Partly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of rain between 2pm and 3pm. Mostly sunny, with a high near 60. Southwest wind 9 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tonight
A slight chance of rain before 11pm, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 50. Southwest wind 8 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers and possibly a thunderstorm. High near 54. Southwest wind 7 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers and possibly a thunderstorm before 11pm, then rain likely after 11pm. Low around 50. South southwest wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Rain likely, then showers and possibly a thunderstorm after 11am. High near 55. Breezy, with a south southwest wind 14 to 22 mph, with gusts as high as 38 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, mainly before 2am, then rain likely after 2am. Low around 45. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Rain likely, then showers and possibly a thunderstorm after 11am. High near 49. Chance of precipitation is 80%.
Sunday Night
A chance of rain before 11pm. Partly cloudy, with a low around 45.
Monday
Mostly sunny, with a high near 53.
Monday Night
Mostly clear, with a low around 46.
Tuesday
Sunny, with a high near 59.
Tuesday Night
Mostly clear, with a low around 46.
Wednesday
Mostly sunny, with a high near 59.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
Last Update:
1:26 am PDT Apr 9, 2026
Forecast Valid:
6am 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