Hawaii and Guam Concerns; Record Warmth Spreads Eastward; Heavy Snow for Sierra-Nevada; Severe Weather for the Plains

A very active spring pattern with tropical concerns across the Pacific. Heavy rainfall will continue to impact Hawaii this weekend. Meanwhile we continue to monitor a developing typhoon that may affect Guam into early next week. For the Lower 48, heavy snow for mountains of California this weekend, increase threat for severe thunderstorms next week for the Plains and record warmth spreads east. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

46°F

8°C

Humidity 99%
Wind Speed SSW 11 MPH
Barometer NA
Dewpoint 45°F (7°C)
Visibility NA
Wind Chill41°F (5°C)
Last update 10 Apr 05:50 PM PDT
Extended Forecast for

3 Miles S Clayton CA

  • Tonight

    Tonight: Rain likely, mainly before 3am.  Mostly cloudy, with a low around 50. South southwest wind 10 to 13 mph, with gusts as high as 24 mph.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Rain Likely
    then Chance
    Rain

  • Saturday

    Saturday: Rain and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm.  Steady temperature around 52. South wind 13 to 21 mph, with gusts as high as 37 mph.  Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 52 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 5am, then rain after 5am.  Low around 46. Breezy, with a south southwest wind 15 to 22 mph, with gusts as high as 37 mph.  Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 46 °F

    Showers and
    Breezy

  • Sunday

    Sunday: Rain before 8am, then showers and possibly a thunderstorm after 8am.  High near 52. South southwest wind 16 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: 52 °F

    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of rain before 11pm.  Partly cloudy, with a low around 47. Southwest wind 7 to 15 mph, with gusts as high as 26 mph.  New precipitation amounts of less than a tenth of an inch possible.

    Low: 47 °F

    Chance Rain
    then Partly
    Cloudy

  • 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

  • Tuesday

    Tuesday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Tuesday Night

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

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
Rain likely, mainly before 3am. Mostly cloudy, with a low around 50. South southwest wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Steady temperature around 52. South wind 13 to 21 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm before 5am, then rain after 5am. Low around 46. Breezy, with a south southwest wind 15 to 22 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Sunday
Rain before 8am, then showers and possibly a thunderstorm after 8am. High near 52. South southwest wind 16 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.
Sunday Night
A 40 percent chance of rain before 11pm. Partly cloudy, with a low around 47. Southwest wind 7 to 15 mph, with gusts as high as 26 mph. New precipitation amounts of less than a tenth of an inch possible.
Monday
Mostly sunny, with a high near 57.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Sunny, with a high near 60.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 62.
Wednesday Night
Partly cloudy, with a low around 48.
Thursday
Sunny, with a high near 63.
Thursday Night
Clear, with a low around 48.
Friday
Sunny, with a high near 66.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Clayton CA
 37.9°N 121.92°W (Elev. 1900 ft)
2:57 pm PDT Apr 10, 2026
9pm PDT Apr 10, 2026-6pm PDT Apr 17, 2026
 
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