National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rain and Flooding Concerns in Hawaii; Severe Weather in the Plains

A storm system is expected to bring strong winds, widespread heavy rainfall, and flooding concerns to the Hawaiian Islands through the weekend. Strong to severe thunderstorms are forecast from the Southern Plains to the Mid-Missouri Valley Thursday afternoon and evening. Large hail and strong winds are the primary threats. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

NA

54°F

12°C

Humidity 95%
Wind Speed WSW 2 MPH
Barometer NA
Dewpoint 53°F (12°C)
Visibility NA
Last update 09 Apr 07:10 AM PDT
Extended Forecast for

Cupertino CA

  • Today

    Today: Mostly sunny, with a high near 73. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 73 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of rain, mainly between midnight and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 53. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 53 °F

    Slight Chance
    Rain then
    Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 67. Calm wind becoming south southwest 5 to 9 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 67 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then rain likely after 11pm. Mostly cloudy, with a low around 50. South wind 5 to 9 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Showers
    Likely

  • Saturday

    Saturday: Rain, mainly before 2pm, then showers and possibly a thunderstorm after 2pm. High near 61. South wind 5 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 61 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 2am, then rain after 2am. Low around 45. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 45 °F

    Showers

  • Sunday

    Sunday: Rain before 11am, then showers likely and possibly a thunderstorm after 11am. High near 58. Chance of precipitation is 80%.

    High: 58 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of rain, mainly before 11pm. Partly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

  • Monday

    Monday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 73. Calm wind becoming west 5 to 7 mph in the afternoon.
Tonight
A chance of rain, mainly between midnight and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 53. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers and possibly a thunderstorm. High near 67. Calm wind becoming south southwest 5 to 9 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of showers and thunderstorms, then rain likely after 11pm. Mostly cloudy, with a low around 50. South wind 5 to 9 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Rain, mainly before 2pm, then showers and possibly a thunderstorm after 2pm. High near 61. South wind 5 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm before 2am, then rain after 2am. Low around 45. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Rain before 11am, then showers likely and possibly a thunderstorm after 11am. High near 58. Chance of precipitation is 80%.
Sunday Night
A chance of rain, mainly before 11pm. Partly cloudy, with a low around 45.
Monday
Mostly sunny, with a high near 63.
Monday Night
Mostly clear, with a low around 44.
Tuesday
Mostly sunny, with a high near 68.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Mostly sunny, with a high near 70.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cupertino CA
 37.31°N 122.06°W (Elev. 610 ft)
Last Update:
1:26 am PDT Apr 9, 2026
Forecast Valid:
8am PDT Apr 9, 2026-6pm PDT Apr 15, 2026
 
Forecast Discussion
 
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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation