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

Heavy Rainfall in Florida; Critical Fire Weather in the Southeast; Heavy Rain and Flooding Concerns in Hawaii

Thunderstorms and periods of heavy to excessive rainfall will continue over Florida through Thursday; and will begin to impact the central Plains today. Dry and gusty conditions will promote elevated to critical fire weather conditions in the Southeast. A Kona Low is expected to bring strong winds, widespread heavy rainfall, and flooding concerns to the island chain through the weekend. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

Lat: 37.66083°NLon: 122.11833°WElev: 46.0ft.

Mostly Cloudy

55°F

13°C

Humidity 87%
Wind Speed N 8 MPH
Barometer 30.03 in (1016.93 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 08 Apr 07:00 AM PDT
Extended Forecast for

Castro Valley CA

  • Today

    Today: Sunny, with a high near 75. Light and variable wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 18 mph.

    High: 75 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. West southwest wind 3 to 8 mph.

    Low: 54 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain after 11am. Partly sunny, with a high near 73. Calm wind becoming west 5 to 8 mph in the afternoon.

    High: 73 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: A 40 percent chance of rain, mainly after 11pm. Mostly cloudy, with a low around 54. West wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 18 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 54 °F

    Chance Rain

  • Friday

    Friday: A chance of rain, then showers likely and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 69. South southwest wind 3 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 69 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 8pm, then rain likely after 8pm. Mostly cloudy, with a low around 52. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 52 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of rain, then showers likely and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 66. Chance of precipitation is 70%.

    High: 66 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of rain. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance Rain

  • Sunday

    Sunday: A chance of showers and thunderstorms. Partly sunny, with a high near 62.

    High: 62 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 75. Light and variable wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Tonight
Mostly cloudy, with a low around 54. West southwest wind 3 to 8 mph.
Thursday
A 20 percent chance of rain after 11am. Partly sunny, with a high near 73. Calm wind becoming west 5 to 8 mph in the afternoon.
Thursday Night
A 40 percent chance of rain, mainly after 11pm. Mostly cloudy, with a low around 54. West wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 18 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday
A chance of rain, then showers likely and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 69. South southwest wind 3 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers likely and possibly a thunderstorm before 8pm, then rain likely after 8pm. Mostly cloudy, with a low around 52. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of rain, then showers likely and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 66. Chance of precipitation is 70%.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 48.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 62.
Sunday Night
A slight chance of rain before 11pm. Partly cloudy, with a low around 46.
Monday
Sunny, with a high near 67.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.72°N 122.05°W (Elev. 397 ft)
Last Update:
6:31 am PDT Apr 8, 2026
Forecast Valid:
7am PDT Apr 8, 2026-6pm PDT Apr 14, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation