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

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

45°F

7°C

Humidity 100%
Wind Speed SSW 9 MPH
Barometer NA
Dewpoint 45°F (7°C)
Visibility NA
Wind Chill40°F (4°C)
Last update 14 Nov 12:20 AM PST
Extended Forecast for

4 Miles SSE Clayton CA

  • Overnight

    Overnight: A 30 percent chance of rain. Mostly cloudy, with a steady temperature around 49. South southwest wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 49 °F

    Chance Rain

  • Friday

    Friday: A 30 percent chance of rain. Partly sunny, with a temperature falling to around 47 by 9am. East southeast wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 51 °F⇓

    Chance Rain

  • Friday Night

    Friday Night: Partly cloudy, with a low around 47. North northeast wind 3 to 5 mph.

    Low: 47 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 55. Light and variable wind becoming west northwest around 6 mph in the morning.

    High: 55 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 50. South southwest wind 6 to 8 mph. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 50 °F

    Chance Rain

  • Sunday

    Sunday: A 50 percent chance of rain. Mostly cloudy, with a high near 55. New precipitation amounts of less than a tenth of an inch possible.

    High: 55 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.

    Low: 46 °F

    Rain Likely

  • Monday

    Monday: A chance of rain, mainly before 4pm. Partly sunny, with a high near 52.

    High: 52 °F

    Chance Rain

  • Monday Night

    Monday Night: A slight chance of rain before 10pm. Partly cloudy, with a low around 45.

    Low: 45 °F

    Slight Chance
    Rain then
    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of rain. Mostly cloudy, with a steady temperature around 49. South southwest wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday
A 30 percent chance of rain. Partly sunny, with a temperature falling to around 47 by 9am. East southeast wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Partly cloudy, with a low around 47. North northeast wind 3 to 5 mph.
Saturday
Mostly cloudy, with a high near 55. Light and variable wind becoming west northwest around 6 mph in the morning.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 50. South southwest wind 6 to 8 mph. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
A 50 percent chance of rain. Mostly cloudy, with a high near 55. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.
Monday
A chance of rain, mainly before 4pm. Partly sunny, with a high near 52.
Monday Night
A slight chance of rain before 10pm. Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Mostly clear, with a low around 44.
Wednesday
A slight chance of rain. Mostly sunny, with a high near 50.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 45.
Thursday
A chance of rain. Partly sunny, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
Last Update:
12:26 am PST Nov 14, 2025
Forecast Valid:
12am PST Nov 14, 2025-6pm PST Nov 20, 2025
 
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