Showers and Thunderstorms for the Eastern Third of the Country; Fire Weather Concerns; Flooding Issues for the Great Lakes Region

Showers and thunderstorms will continue along and ahead of a cold front for the eastern third of the country. The rainfall for the Great Lakes region could prolong the ongoing flooding. Much cooler weather will filter in behind this cold front along and east of the Rockies. Where the rain is needed, the Southern High Plains, critical fire weather concerns through this weekend. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

70°F

21°C

Humidity 43%
Wind Speed WNW 12 MPH
Barometer 29.84 in (1010.5 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 19 Apr 03:00 PM PDT
Extended Forecast for

Castro Valley CA

  • Tonight

    Tonight: A 30 percent chance of rain after 5am.  Partly cloudy, with a low around 50. West wind 6 to 11 mph becoming south southeast after midnight.

    Low: 50 °F

    Partly Cloudy
    then Chance
    Rain

  • Monday

    Monday: Rain likely, mainly after 4pm.  Partly sunny, with a high near 70. Southeast wind 7 to 16 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.  Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 70 °F

    Rain Likely

  • Monday Night

    Monday Night: Rain.  Low around 52. Southwest wind 6 to 11 mph becoming light  after midnight. Winds could gust as high as 18 mph.  Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 52 °F

    Rain

  • Tuesday

    Tuesday: Rain before 11am, then showers and possibly a thunderstorm, mainly after 11am.  High near 62. South southeast wind 6 to 11 mph, with gusts as high as 21 mph.  Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 62 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 8pm, then rain likely, mainly between 8pm and 11pm.  Mostly cloudy, with a low around 50. Southwest wind 7 to 10 mph, with gusts as high as 20 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 then
    Chance Rain

  • Wednesday

    Wednesday: A 30 percent chance of rain, mainly before 11am.  Mostly sunny, with a high near 64. New precipitation amounts of less than a tenth of an inch possible.

    High: 64 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 48.

    Low: 48 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of rain after 5am. Partly cloudy, with a low around 50. West wind 6 to 11 mph becoming south southeast after midnight.
Monday
Rain likely, mainly after 4pm. Partly sunny, with a high near 70. Southeast wind 7 to 16 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Rain. Low around 52. Southwest wind 6 to 11 mph becoming light after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday
Rain before 11am, then showers and possibly a thunderstorm, mainly after 11am. High near 62. South southeast wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
Showers likely and possibly a thunderstorm before 8pm, then rain likely, mainly between 8pm and 11pm. Mostly cloudy, with a low around 50. Southwest wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 30 percent chance of rain, mainly before 11am. Mostly sunny, with a high near 64. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Mostly sunny, with a high near 68.
Thursday Night
Partly cloudy, with a low around 48.
Friday
Mostly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 69.
Saturday Night
Partly cloudy, with a low around 51.
Sunday
Mostly sunny, with a high near 68.
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.72°N 122.05°W (Elev. 397 ft)
1:26 pm PDT Apr 19, 2026
3pm PDT Apr 19, 2026-6pm PDT Apr 26, 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