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Dangerous Heat in the West; Coastal Flooding & High Rip Current Risk through the Weekend on the East Coast; Flash Flooding Concerns in the Southeast and Southwest

A dangerous, record heat wave continues across portions of the West through Tuesday. High rip current risk and dangerous surf continue through the weekend. There are flash flooding concerns through the weekend for portions of the Southeast and Southwest. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Diablo Summit Museum and Trailhead Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

NA

81°F

27°C

Humidity 11%
Wind Speed WNW 4 MPH
Barometer NA
Dewpoint 23°F (-5°C)
Visibility NA
Heat Index79°F (26°C)
Last update 22 Aug 08:20 PM PDT
Extended Forecast for

6 Miles ENE San Ramon CA

Heat Advisory August 22, 08:42pm until August 23, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 22, 08:42pm until August 23, 09:00pm

    NOW until 9:00pm Sat

    Heat Advisory

  • Tonight

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 89. Light west northwest wind becoming west southwest 5 to 10 mph in the morning.

    High: 89 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 58. West southwest wind 5 to 7 mph.

    Low: 58 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 86. West southwest wind 5 to 10 mph.

    High: 86 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58. West southwest wind 6 to 9 mph.

    Low: 58 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 60. West southwest wind around 5 mph becoming light and variable in the evening.
Saturday
Sunny, with a high near 89. Light west northwest wind becoming west southwest 5 to 10 mph in the morning.
Saturday Night
Increasing clouds, with a low around 58. West southwest wind 5 to 7 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 86. West southwest wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 58. West southwest wind 6 to 9 mph.
Monday
Mostly sunny, with a high near 86.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
Sunny, with a high near 84.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
6 Miles ENE San Ramon CA
 37.79°N 121.87°W (Elev. 801 ft)
Last Update:
1:26 pm PDT Aug 22, 2025
Forecast Valid:
8pm PDT Aug 22, 2025-6pm PDT Aug 29, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation