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 >

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

4 Miles NNE San Ramon CA

Heat Advisory August 22, 08:44pm until August 23, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 22, 08:44pm until August 23, 09:00pm

    NOW until 9:00pm Sat

    Heat Advisory

  • Tonight

    Low: 59 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 89. Light south southwest 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. South wind 3 to 6 mph.

    Low: 58 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 85. Light and variable wind becoming west southwest 5 to 9 mph in the morning.

    High: 85 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58. Southwest wind 5 to 9 mph.

    Low: 58 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 85.

    High: 85 °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
Increasing clouds, with a low around 59. Light and variable wind.
Saturday
Sunny, with a high near 89. Light south southwest wind becoming west southwest 5 to 10 mph in the morning.
Saturday Night
Increasing clouds, with a low around 58. South wind 3 to 6 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 85. Light and variable wind becoming west southwest 5 to 9 mph in the morning.
Sunday Night
Partly cloudy, with a low around 58. Southwest wind 5 to 9 mph.
Monday
Mostly sunny, with a high near 85.
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 83.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Sunny, with a high near 83.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE San Ramon CA
 37.81°N 121.9°W (Elev. 1086 ft)
1:26 pm PDT Aug 22, 2025
8pm PDT Aug 22, 2025-6pm PDT Aug 29, 2025
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database