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 S Clayton CA

  • Overnight

    Overnight: Partly cloudy, with a low around 47. West northwest wind 6 to 8 mph.

    Low: 47 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 65. East northeast wind around 6 mph becoming light and variable.

    High: 65 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 52. West northwest wind around 9 mph becoming south after midnight.

    Low: 52 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 62. West southwest wind 9 to 11 mph, with gusts as high as 23 mph.

    High: 62 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 48. South southwest wind 10 to 15 mph, with gusts as high as 28 mph.

    Low: 48 °F

    Partly Cloudy

  • Monday

    Monday: A 40 percent chance of showers, mainly after 11am.  Partly sunny, with a high near 61. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 61 °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 50. Chance of precipitation is 80%.

    Low: 50 °F

    Showers

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 11am.  Cloudy, with a high near 53.

    High: 53 °F

    Showers

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before 11pm.  Mostly cloudy, with a low around 47.

    Low: 47 °F

    Rain Likely

Detailed Forecast

Overnight
Partly cloudy, with a low around 47. West northwest wind 6 to 8 mph.
Saturday
Sunny, with a high near 65. East northeast wind around 6 mph becoming light and variable.
Saturday Night
Mostly cloudy, with a low around 52. West northwest wind around 9 mph becoming south after midnight.
Sunday
Partly sunny, with a high near 62. West southwest wind 9 to 11 mph, with gusts as high as 23 mph.
Sunday Night
Partly cloudy, with a low around 48. South southwest wind 10 to 15 mph, with gusts as high as 28 mph.
Monday
A 40 percent chance of showers, mainly after 11am. Partly sunny, with a high near 61. 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 50. Chance of precipitation is 80%.
Tuesday
Showers, with thunderstorms also possible after 11am. Cloudy, with a high near 53.
Tuesday Night
Rain likely, mainly before 11pm. Mostly cloudy, with a low around 47.
Wednesday
A chance of rain. Partly sunny, with a high near 53.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Mostly sunny, with a high near 57.
Thursday Night
Mostly clear, with a low around 45.
Friday
Sunny, with a high near 60.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
1:26 am PDT Apr 18, 2026
1am PDT Apr 18, 2026-6pm PDT Apr 24, 2026
 
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