Severe Thunderstorms for the Center of the Nation; Fire Weather Concerns; Flooding Issues for the Great Lakes Region

A round of severe thunderstorms are forecast across areas of the Southern Plains, Mississippi Valley and Great Lakes this afternoon and tonight; The threat for flash flooding will also accompany these storms. The rainfall for the Great Lakes region could prolong the ongoing flooding. Where the rain is needed, the Southern High Plains, critical fire weather concerns through today. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

51°F

11°C

Humidity 28%
Wind Speed NNE 3 MPH
Barometer NA
Dewpoint 19°F (-7°C)
Visibility NA
Last update 17 Apr 08:05 PM PDT
Extended Forecast for

4 Miles SSE Clayton CA

  • Overnight

    Overnight: Mostly clear, with a low around 48. West southwest wind around 6 mph.

    Low: 48 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 69. South wind around 6 mph becoming north northeast in the afternoon.

    High: 69 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 54. West northwest wind around 8 mph becoming south after midnight.

    Low: 54 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 67. West southwest wind 7 to 11 mph, with gusts as high as 21 mph.

    High: 67 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 49. Southwest wind 9 to 14 mph, with gusts as high as 25 mph.

    Low: 49 °F

    Partly Cloudy

  • Monday

    Monday: A 40 percent chance of showers, mainly after 11am.  Partly sunny, with a high near 65. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 65 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 11pm, then showers after 11pm.  Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Showers

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 11am.  Cloudy, with a high near 55.

    High: 55 °F

    Showers

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before 11pm.  Mostly cloudy, with a low around 50.

    Low: 50 °F

    Rain Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 48. West southwest wind around 6 mph.
Saturday
Sunny, with a high near 69. South wind around 6 mph becoming north northeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 54. West northwest wind around 8 mph becoming south after midnight.
Sunday
Partly sunny, with a high near 67. West southwest wind 7 to 11 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 49. Southwest wind 9 to 14 mph, with gusts as high as 25 mph.
Monday
A 40 percent chance of showers, mainly after 11am. Partly sunny, with a high near 65. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Showers likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 11pm, then showers after 11pm. Low around 53. Chance of precipitation is 80%.
Tuesday
Showers, with thunderstorms also possible after 11am. Cloudy, with a high near 55.
Tuesday Night
Rain likely, mainly before 11pm. Mostly cloudy, with a low around 50.
Wednesday
A chance of rain. Mostly sunny, with a high near 57.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 61.
Thursday Night
Mostly clear, with a low around 47.
Friday
Sunny, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.9°N 121.9°W (Elev. 1814 ft)
1:41 am PDT Apr 18, 2026
3am PDT Apr 18, 2026-6pm PDT Apr 24, 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