Heavy Rain and Flash Flooding in the West; Heat Expands in the Central U.S.

Monsoonal moisture will produce showers and thunderstorms with heavy rain over parts of the Southwest, Great Basin, and Central Rockies through Monday. Flash flooding is possible, especially in and around burn scars and in areas of steep terrain. Heat will persist across the Central U.S. early this week, spreading into the Ohio Valley and Mid-Atlantic later this week. Read More >

Current conditions at

DIABLO GRANDE (DBLC1)

Lat: 37.32927°NLon: 121.29538°WElev: 1861.0ft.

NA

70°F

21°C

Humidity 38%
Wind Speed SSE 4 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Last update 30 Aug 09:00 PM PDT
Extended Forecast for

20 Miles E Mount Hamilton CA

  • Tonight

    Tonight: Clear, with a low around 60. Southwest wind 3 to 5 mph.

    Low: 60 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 85. West southwest wind 5 to 9 mph becoming southeast in the morning.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. Southwest wind around 6 mph.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny, with a high near 76. Light and variable wind becoming south southeast 5 to 9 mph in the morning.

    High: 76 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 55. West wind 5 to 9 mph becoming calm  in the evening.

    Low: 55 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 60. Southwest wind 3 to 5 mph.
Monday
Sunny, with a high near 85. West southwest wind 5 to 9 mph becoming southeast in the morning.
Monday Night
Mostly clear, with a low around 55. Southwest wind around 6 mph.
Tuesday
Partly sunny, then gradually becoming sunny, with a high near 76. Light and variable wind becoming south southeast 5 to 9 mph in the morning.
Tuesday Night
Mostly clear, with a low around 55. West wind 5 to 9 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 60.
Friday
Sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 59.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Sunny, with a high near 84.
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ABOUT THIS FORECAST

 
Point Forecast:
20 Miles E Mount Hamilton CA
 37.38°N 121.28°W (Elev. 1401 ft)
2:01 pm PDT Aug 30, 2026
9pm PDT Aug 30, 2026-6pm PDT Sep 6, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database