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

Heavy Rain and Flooding Concerns in Hawaii; Severe Weather this Weekend in the Plains; Pacific Storm in the West

A storm system near the Hawaiian Islands is expected to bring periods of heavy rainfall, strong winds, and isolated strong to severe thunderstorms through Friday. Several rounds of severe thunderstorms are forecast to impact parts of the Great Plains into the Midwest this weekend into next week. Moderate to heavy rainfall and high elevation snow is expected this weekend over California and Oregon. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

49°F

9°C

Humidity 88%
Wind Speed SSW 16 MPH
Barometer NA
Dewpoint 46°F (8°C)
Visibility NA
Wind Chill43°F (6°C)
Last update 09 Apr 09:20 PM PDT
Extended Forecast for

3 Miles SSE Clayton CA

  • Tonight

    Tonight: A 30 percent chance of showers, mainly between 2am and 5am. Mostly cloudy, with a low around 53. Southwest wind 6 to 11 mph, with gusts as high as 22 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 53 °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 58. Southwest wind 7 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 58 °F

    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 52. Southwest wind 9 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 52 °F

    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 2pm. High near 56. South southwest wind 11 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 56 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 48. South southwest wind 14 to 18 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 48 °F

    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 11am. High near 51. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 51 °F

    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of rain, mainly before 11pm. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance Rain
    then Slight
    Chance Rain

  • Monday

    Monday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers, mainly between 2am and 5am. Mostly cloudy, with a low around 53. Southwest wind 6 to 11 mph, with gusts as high as 22 mph. New precipitation amounts of less than a tenth of an inch possible.
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 58. Southwest wind 7 to 13 mph, with gusts as high as 24 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 52. Southwest wind 9 to 14 mph, with gusts as high as 25 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 56. South southwest wind 11 to 18 mph, with gusts as high as 36 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 48. South southwest wind 14 to 18 mph, with gusts as high as 34 mph. 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 51. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 50 percent chance of rain, mainly before 11pm. Mostly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 57.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Sunny, with a high near 61.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Mostly sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Clayton CA
 37.9°N 121.9°W (Elev. 1814 ft)
Last Update:
4:46 pm PDT Apr 9, 2026
Forecast Valid:
9pm PDT Apr 9, 2026-6pm PDT Apr 16, 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