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

Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Current conditions at

DIABLO GRANDE (DBLC1)

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

NA

63°F

17°C

Humidity 51%
Wind Speed S 9 MPH
Barometer NA
Dewpoint 44°F (7°C)
Visibility NA
Last update 18 Jun 01:00 AM PDT
Extended Forecast for

18 Miles E Mount Hamilton CA

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 65. South wind around 5 mph.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 85. South southeast wind 3 to 8 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 58. Southwest wind 5 to 7 mph becoming light and variable after midnight.

    Low: 58 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Sunny, with a high near 80. Light and variable wind becoming south 5 to 8 mph in the afternoon.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 56. South wind 5 to 7 mph becoming light and variable in the evening.

    Low: 56 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

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

    Low: 58 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 63.

    Low: 63 °F

    Clear

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 65. South wind around 5 mph.
Thursday
Sunny, with a high near 85. South southeast wind 3 to 8 mph.
Thursday Night
Mostly clear, with a low around 58. Southwest wind 5 to 7 mph becoming light and variable after midnight.
Juneteenth
Sunny, with a high near 80. Light and variable wind becoming south 5 to 8 mph in the afternoon.
Friday Night
Mostly clear, with a low around 56. South wind 5 to 7 mph becoming light and variable in the evening.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 58.
Sunday
Sunny, with a high near 86.
Sunday Night
Clear, with a low around 63.
Monday
Sunny, with a high near 90.
Monday Night
Clear, with a low around 67.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Clear, with a low around 69.
Wednesday
Sunny, with a high near 95.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
18 Miles E Mount Hamilton CA
 37.35°N 121.33°W (Elev. 1719 ft)
Last Update:
11:31 pm PDT Jun 17, 2026
Forecast Valid:
2am PDT Jun 18, 2026-6pm PDT Jun 24, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

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Chance of Precipitation