National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Current conditions at

DIABLO GRANDE (DBLC1)

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

NA

71°F

22°C

Humidity 42%
Wind Speed S 9 MPH
Barometer NA
Dewpoint 47°F (8°C)
Visibility NA
Last update 17 Jun 12:00 AM PDT
Extended Forecast for

20 Miles E Mount Hamilton CA

  • Overnight

    Overnight: Mostly clear, with a low around 66. South southwest wind 3 to 5 mph.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90. Light and variable wind becoming east 5 to 8 mph in the morning.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 62. West southwest wind 5 to 7 mph becoming light and variable.

    Low: 62 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 87. Light and variable wind becoming northeast 5 to 7 mph in the afternoon.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59. West wind 3 to 7 mph.

    Low: 59 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 58.

    Low: 58 °F

    Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 66. South southwest wind 3 to 5 mph.
Wednesday
Sunny, with a high near 90. Light and variable wind becoming east 5 to 8 mph in the morning.
Wednesday Night
Clear, with a low around 62. West southwest wind 5 to 7 mph becoming light and variable.
Thursday
Sunny, with a high near 87. Light and variable wind becoming northeast 5 to 7 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 59. West wind 3 to 7 mph.
Juneteenth
Sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 56.
Saturday
Sunny, with a high near 82.
Saturday Night
Clear, with a low around 58.
Sunday
Sunny, with a high near 86.
Sunday Night
Clear, with a low around 60.
Monday
Sunny, with a high near 88.
Monday Night
Clear, with a low around 62.
Tuesday
Sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
20 Miles E Mount Hamilton CA
 37.38°N 121.28°W (Elev. 1401 ft)
Last Update:
11:31 pm PDT Jun 16, 2026
Forecast Valid:
12am PDT Jun 17, 2026-6pm PDT Jun 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation