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

56°F

13°C

Humidity 15%
Wind Speed NNE 4 MPH
Barometer NA
Dewpoint 10°F (-12°C)
Visibility NA
Last update 12 Jan 02:35 PM PST
Extended Forecast for

2 Miles S Clayton CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 57. East northeast wind around 8 mph.

    High: 57 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 42. Southeast wind 5 to 7 mph.

    Low: 42 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 59. East northeast wind around 8 mph.

    High: 59 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 42. East wind around 5 mph becoming calm in the evening.

    Low: 42 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 60. Northeast wind 5 to 7 mph.

    High: 60 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 57. East northeast wind around 8 mph.
Tonight
Mostly clear, with a low around 42. Southeast wind 5 to 7 mph.
Tuesday
Sunny, with a high near 59. East northeast wind around 8 mph.
Tuesday Night
Mostly clear, with a low around 42. East wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 60. Northeast wind 5 to 7 mph.
Wednesday Night
Mostly clear, with a low around 42.
Thursday
Sunny, with a high near 61.
Thursday Night
Mostly clear, with a low around 44.
Friday
Sunny, with a high near 61.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 61.
Saturday Night
Mostly clear, with a low around 44.
Sunday
Sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Clayton CA
 37.92°N 121.93°W (Elev. 600 ft)
Last Update:
12:41 pm PST Jan 12, 2026
Forecast Valid:
2pm PST Jan 12, 2026-6pm PST Jan 18, 2026
 
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Additional Resources

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