Lake Effect Snow in the Lower Great Lakes; Unsettled Pattern in the Pacific Northwest

Lake-effect snow will continue downwind of Lakes Erie and Ontario through Friday. Lake Effect Snow Warnings have been issued. In the Western U.S., rain and higher elevation snow will continue over the Great Basin through Friday. A front will move over the Pacific Northwest this afternoon and produce light rain and higher elevation snow over the Cascades through Saturday. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

41°F

5°C

Humidity 94%
Wind Speed N 3 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Last update 12 Feb 11:20 AM PST
Extended Forecast for

2 Miles SSE Clayton CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 61. North wind around 6 mph.

    High: 61 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 46. Southwest wind around 6 mph.

    Low: 46 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 64. West southwest wind 3 to 8 mph.

    High: 64 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 46. South southwest wind around 8 mph.

    Low: 46 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, with a high near 61. South southwest wind 5 to 7 mph.

    High: 61 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of showers, mainly after 10pm.  Mostly cloudy, with a low around 48. New precipitation amounts of less than a tenth of an inch possible.

    Low: 48 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 10am.  High near 60. Chance of precipitation is 80%.

    High: 60 °F

    Showers

  • Sunday Night

    Sunday Night: Showers.  Cloudy, with a low around 49.

    Low: 49 °F

    Showers

  • Washington's Birthday

    Washington's Birthday: Showers, with thunderstorms also possible after 4pm.  Cloudy, with a high near 55.

    High: 55 °F

    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 61. North wind around 6 mph.
Tonight
Mostly clear, with a low around 46. Southwest wind around 6 mph.
Friday
Sunny, with a high near 64. West southwest wind 3 to 8 mph.
Friday Night
Increasing clouds, with a low around 46. South southwest wind around 8 mph.
Saturday
Mostly cloudy, with a high near 61. South southwest wind 5 to 7 mph.
Saturday Night
A 40 percent chance of showers, mainly after 10pm. Mostly cloudy, with a low around 48. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Showers, mainly after 10am. High near 60. Chance of precipitation is 80%.
Sunday Night
Showers. Cloudy, with a low around 49.
Washington's Birthday
Showers, with thunderstorms also possible after 4pm. Cloudy, with a high near 55.
Monday Night
Showers and possibly a thunderstorm. Cloudy, with a low around 45.
Tuesday
Showers. Mostly cloudy, with a high near 52.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 42.
Wednesday
Showers likely. Mostly cloudy, with a high near 54.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Clayton CA
 37.92°N 121.93°W (Elev. 600 ft)
12:44 pm PST Feb 12, 2026
2pm PST Feb 12, 2026-6pm PST Feb 18, 2026
 
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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