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

Mountain View, Moffett Field (KNUQ)

Lat: 37.40583°NLon: 122.04806°WElev: 33.0ft.

Clear

79°F

26°C

Humidity 50%
Wind Speed N 6 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 27 Aug 02:55 PM PDT
Extended Forecast for

Sunnyvale CA

  • Tonight

    Tonight: A 20 percent chance of showers after 4am.  Mostly cloudy, with a low around 63. North northeast wind around 5 mph becoming calm  in the evening.

    Low: 63 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers.  Cloudy, then gradually becoming mostly sunny, with a high near 76. Calm wind becoming north 5 to 9 mph in the morning.

    High: 76 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 58. North wind 5 to 7 mph becoming calm  in the evening.

    Low: 58 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 75. Light west wind becoming west northwest 5 to 10 mph in the afternoon.

    High: 75 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57. West southwest wind 5 to 11 mph, with gusts as high as 18 mph.

    Low: 57 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Monday

    Monday: Patchy fog before 8am.  Otherwise, mostly sunny, with a high near 72.

    High: 72 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 63. North northeast wind around 5 mph becoming calm in the evening.
Friday
A 20 percent chance of showers. Cloudy, then gradually becoming mostly sunny, with a high near 76. Calm wind becoming north 5 to 9 mph in the morning.
Friday Night
Partly cloudy, with a low around 58. North wind 5 to 7 mph becoming calm in the evening.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 75. Light west wind becoming west northwest 5 to 10 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 57. West southwest wind 5 to 11 mph, with gusts as high as 18 mph.
Sunday
Mostly sunny, with a high near 75.
Sunday Night
Mostly clear, with a low around 56.
Monday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 73.
Tuesday Night
Partly cloudy, with a low around 57.
Wednesday
Patchy fog. Otherwise, mostly sunny, with a high near 75.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 58.
Thursday
A slight chance of showers. Mostly sunny, with a high near 76.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Sunnyvale CA
 37.38°N 122.05°W (Elev. 118 ft)
1:42 pm PDT Aug 27, 2026
3pm PDT Aug 27, 2026-6pm PDT Sep 3, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database