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

Rapid Warm-Up Forecast Across Much of the Lower 48 Today and Tuesday

Most of the U.S. starts the week calm and unseasonably warm. The Heartland will be warmest, with highs 25–30° above average. Only the Gulf Coast stays chilly. Rain today is limited to western Washington while lake effect snow continues east of Lake Ontario. Cooler air returns after Tuesday, bringing a wintry mix to the Midwest and Northeast by Wednesday. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

58°F

14°C

Humidity 21%
Wind Speed NE 8 MPH
Barometer NA
Dewpoint 19°F (-7°C)
Visibility NA
Last update 12 Jan 04:50 PM PST
Extended Forecast for

4 Miles SSE Clayton CA

  • Tonight

    Tonight: Clear, with a steady temperature around 49. East northeast wind 6 to 8 mph.

    Low: 49 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 56. East northeast wind 7 to 9 mph.

    High: 56 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 46. North northeast wind around 7 mph.

    Low: 46 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 54. Northeast wind around 7 mph.

    High: 54 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 42. East northeast wind 6 to 8 mph.

    Low: 42 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a steady temperature around 49. East northeast wind 6 to 8 mph.
Tuesday
Sunny, with a high near 56. East northeast wind 7 to 9 mph.
Tuesday Night
Clear, with a low around 46. North northeast wind around 7 mph.
Wednesday
Sunny, with a high near 54. Northeast wind around 7 mph.
Wednesday Night
Mostly clear, with a low around 42. East northeast wind 6 to 8 mph.
Thursday
Sunny, with a high near 56.
Thursday Night
Mostly clear, with a low around 43.
Friday
Sunny, with a high near 56.
Friday Night
Mostly clear, with a low around 41.
Saturday
Sunny, with a high near 55.
Saturday Night
Mostly clear, with a low around 42.
Sunday
Sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 43.
M.L.King Day
Mostly sunny, with a high near 55.
Basemap Options
Click map to change the forecast location
Loading map...
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:
12:41 pm PST Jan 12, 2026
Forecast Valid:
5pm PST Jan 12, 2026-6pm PST Jan 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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