Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

DIABLO GRANDE (DBLC1)

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

NA

77°F

25°C

Humidity 13%
Wind Speed W 3 MPH
Barometer NA
Dewpoint 22°F (-6°C)
Visibility NA
Heat Index76°F (24°C)
Last update 27 Aug 07:00 AM PDT
Extended Forecast for

21 Miles E Mount Hamilton CA

  • Today

    Today: A 20 percent chance of rain after 11am.  Increasing clouds, with a high near 92. Northwest wind 6 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 18 mph.

    High: 92 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: A 20 percent chance of rain after 11pm.  Mostly cloudy, with a low around 74. West wind around 5 mph becoming calm  in the evening.

    Low: 74 °F

    Slight Chance
    Rain

  • Friday

    Friday: A 20 percent chance of rain before 11am.  Mostly cloudy, with a high near 86. Light and variable wind becoming north northwest 5 to 8 mph in the morning.

    High: 86 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 64. North northwest wind 5 to 7 mph becoming calm  in the evening.

    Low: 64 °F

    Gradual
    Clearing

  • Saturday

    Saturday: Sunny, with a high near 87. Calm wind becoming north 5 to 9 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 87 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 59.

    Low: 59 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 57.

    Low: 57 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of rain after 11am. Increasing clouds, with a high near 92. Northwest wind 6 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 18 mph.
Tonight
A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 74. West wind around 5 mph becoming calm in the evening.
Friday
A 20 percent chance of rain before 11am. Mostly cloudy, with a high near 86. Light and variable wind becoming north northwest 5 to 8 mph in the morning.
Friday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around 64. North northwest wind 5 to 7 mph becoming calm in the evening.
Saturday
Sunny, with a high near 87. Calm wind becoming north 5 to 9 mph in the afternoon. Winds could gust as high as 18 mph.
Saturday Night
Clear, with a low around 59.
Sunday
Sunny, with a high near 85.
Sunday Night
Clear, with a low around 57.
Monday
Sunny, with a high near 81.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 57.
Wednesday
A slight chance of rain. Sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
21 Miles E Mount Hamilton CA
 37.41°N 121.26°W (Elev. 1007 ft)
2:00 am PDT Aug 27, 2026
8am PDT Aug 27, 2026-6pm PDT Sep 2, 2026
 
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Additional Resources

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