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

47°F

8°C

Humidity 84%
Wind Speed SW 16 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Wind Chill41°F (5°C)
Last update 09 Apr 10:20 PM PDT
Extended Forecast for

Clayton CA

  • Overnight

    Overnight: A chance of rain before 5am, then showers likely after 5am. Mostly cloudy, with a low around 55. South southwest wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 55 °F

    Showers
    Likely

  • 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 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: 63 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 11pm, then a chance of rain after 11pm. Mostly cloudy, with a low around 53. South southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 53 °F

    Showers
    Likely

  • Saturday

    Saturday: Rain likely, then showers and possibly a thunderstorm after 11am. High near 60. South wind 9 to 18 mph, with gusts as high as 32 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

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 2am, then rain after 2am. Low around 50. South wind 13 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 50 °F

    Showers

  • Sunday

    Sunday: Rain before 8am, then showers and possibly a thunderstorm after 8am. High near 55. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 55 °F

    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of rain before 11pm. Partly cloudy, with a low around 48.

    Low: 48 °F

    Chance Rain
    then Partly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Monday Night

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

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Overnight
A chance of rain before 5am, then showers likely after 5am. Mostly cloudy, with a low around 55. South southwest wind around 6 mph. Chance of precipitation is 60%. 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 63. South southwest wind 6 to 14 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.
Friday Night
Showers likely and possibly a thunderstorm before 11pm, then a chance of rain after 11pm. Mostly cloudy, with a low around 53. South southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Rain likely, then showers and possibly a thunderstorm after 11am. High near 60. South wind 9 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and possibly a thunderstorm before 2am, then rain after 2am. Low around 50. South wind 13 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
Rain before 8am, then showers and possibly a thunderstorm after 8am. High near 55. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 40 percent chance of rain before 11pm. Partly cloudy, with a low around 48.
Monday
Mostly sunny, with a high near 60.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Sunny, with a high near 64.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Sunny, with a high near 68.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
Last Update:
2:51 am PDT Apr 10, 2026
Forecast Valid:
3am PDT Apr 10, 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