Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

NA

15°C

59°F

Humidity 94%
Wind Speed S 0 MPH
Barometer NA
Dewpoint 14°C (57°F)
Visibility NA
Last update 19 Aug 04:10 AM PDT
Extended Forecast for

Cupertino CA

  • Today

    Today: Partly sunny, then gradually becoming sunny, with a high near 30. Light and variable wind becoming north northwest 6 to 11 km/h in the afternoon.

    High: 30 °C

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 15. North wind 5 to 8 km/h becoming calm  in the evening.

    Low: 15 °C

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 28. Light northwest wind increasing to 8 to 13 km/h in the afternoon.

    High: 28 °C

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 15. Northwest wind 6 to 11 km/h becoming light west northwest  after midnight.

    Low: 15 °C

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 27. Light west northwest wind becoming northwest 8 to 13 km/h in the afternoon.

    High: 27 °C

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 14.

    Low: 14 °C

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 28.

    High: 28 °C

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 14.

    Low: 14 °C

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 28.

    High: 28 °C

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 30. Light and variable wind becoming north northwest 6 to 11 km/h in the afternoon.
Tonight
Increasing clouds, with a low around 15. North wind 5 to 8 km/h becoming calm in the evening.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 28. Light northwest wind increasing to 8 to 13 km/h in the afternoon.
Thursday Night
Mostly cloudy, with a low around 15. Northwest wind 6 to 11 km/h becoming light west northwest after midnight.
Friday
Partly sunny, with a high near 27. Light west northwest wind becoming northwest 8 to 13 km/h in the afternoon.
Friday Night
Partly cloudy, with a low around 14.
Saturday
Sunny, with a high near 28.
Saturday Night
Mostly clear, with a low around 14.
Sunday
Mostly sunny, with a high near 28.
Sunday Night
Mostly clear, with a low around 14.
Monday
Mostly sunny, with a high near 28.
Monday Night
Partly cloudy, with a low around 14.
Tuesday
Mostly sunny, with a high near 27.
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ABOUT THIS FORECAST

 
Point Forecast:
Cupertino CA
 37.31°N 122.03°W (Elev. 262 m)
2:31 am PDT Aug 19, 2026
4am PDT Aug 19, 2026-6pm PDT Aug 25, 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