Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

FW3625 San Ramon (F3625)

Lat: 37.738°NLon: 121.945°WElev: 415.09ft.

NA

82°F

28°C

Humidity 34%
Wind Speed SW 1 MPH
Barometer 30.14 in (1020.66 mb)
Dewpoint 51°F (11°C)
Visibility NA
Heat Index81°F (27°C)
Last update 21 Aug 03:25 PM PDT
Extended Forecast for

4 Miles NNE Castro Valley CA

  • Tonight

    Tonight: Increasing clouds, with a low around 55. Southwest wind 7 to 9 mph.

    Low: 55 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Cloudy through mid morning, then gradual clearing, with a high near 79. Southwest wind 7 to 9 mph, with gusts as high as 18 mph.

    High: 79 °F

    Gradual
    Clearing

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 55. South southwest wind 6 to 8 mph.

    Low: 55 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 80. Southwest wind 6 to 8 mph.

    High: 80 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 56. Southwest wind 7 to 9 mph.

    Low: 56 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 55. Southwest wind 7 to 9 mph.
Saturday
Cloudy through mid morning, then gradual clearing, with a high near 79. Southwest wind 7 to 9 mph, with gusts as high as 18 mph.
Saturday Night
Increasing clouds, with a low around 55. South southwest wind 6 to 8 mph.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 80. Southwest wind 6 to 8 mph.
Sunday Night
Mostly cloudy, with a low around 56. Southwest wind 7 to 9 mph.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 55.
Tuesday
Partly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 55.
Friday
Mostly sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Castro Valley CA
 37.76°N 122.03°W (Elev. 604 ft)
1:47 pm PDT Aug 21, 2026
3pm PDT Aug 21, 2026-6pm PDT Aug 28, 2026
 
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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