Severe Thunderstorms for the Center of the Nation; Fire Weather Concerns; Flooding Issues for the Great Lakes Region

A round of severe thunderstorms are forecast across areas of the Southern Plains, Mississippi Valley and Great Lakes this afternoon and tonight; The threat for flash flooding will also accompany these storms. The rainfall for the Great Lakes region could prolong the ongoing flooding. Where the rain is needed, the Southern High Plains, critical fire weather concerns through today. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

NA

45°F

7°C

Humidity 71%
Wind Speed WSW 3 MPH
Barometer NA
Dewpoint 36°F (2°C)
Visibility NA
Last update 18 Apr 04:10 AM PDT
Extended Forecast for

5 Miles WSW Cupertino CA

  • Today

    Today: Mostly sunny, with a high near 71. Calm wind becoming south around 5 mph in the afternoon.

    High: 71 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 53. Light and variable wind.

    Low: 53 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 66. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 66 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 50. South wind around 8 mph, with gusts as high as 20 mph.

    Low: 50 °F

    Partly Cloudy

  • Monday

    Monday: A 40 percent chance of showers.  Partly sunny, with a high near 63. South southeast wind around 10 mph, with gusts as high as 25 mph.  New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm.  Low around 52. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 52 °F

    Showers

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 11am.  High near 56. Chance of precipitation is 90%.

    High: 56 °F

    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 11pm, then a chance of rain after 11pm.  Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of rain, mainly before 11am.  Mostly sunny, with a high near 58.

    High: 58 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 71. Calm wind becoming south around 5 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 53. Light and variable wind.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 66. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 50. South wind around 8 mph, with gusts as high as 20 mph.
Monday
A 40 percent chance of showers. Partly sunny, with a high near 63. South southeast wind around 10 mph, with gusts as high as 25 mph. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Showers and possibly a thunderstorm. Low around 52. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
Showers, with thunderstorms also possible after 11am. High near 56. Chance of precipitation is 90%.
Tuesday Night
A chance of showers and thunderstorms before 11pm, then a chance of rain after 11pm. Mostly cloudy, with a low around 49.
Wednesday
A chance of rain, mainly before 11am. Mostly sunny, with a high near 58.
Wednesday Night
Partly cloudy, with a low around 49.
Thursday
Mostly sunny, with a high near 62.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Cupertino CA
 37.29°N 122.14°W (Elev. 1798 ft)
1:41 am PDT Apr 18, 2026
4am PDT Apr 18, 2026-6pm PDT Apr 24, 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