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

Hayward, Hayward Air Terminal (KHWD)

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

Overcast

57°F

14°C

Humidity 93%
Wind Speed ENE 3 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 14 Nov 04:05 AM PST
Extended Forecast for

Castro Valley CA

  • Overnight

    Overnight: A 20 percent chance of rain. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 52. Calm wind.

    Low: 52 °F

    Slight Chance
    Rain and
    Patchy Fog

  • Friday

    Friday: A 40 percent chance of rain, mainly after 10am. Patchy fog before 7am. Otherwise, partly sunny, with a high near 64. Calm wind becoming south southwest around 5 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.

    High: 64 °F

    Chance Rain
    and Patchy
    Fog

  • Friday Night

    Friday Night: A 10 percent chance of rain after 4am. Partly cloudy, with a low around 50. Calm wind.

    Low: 50 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 30 percent chance of rain, mainly after 10am. Mostly cloudy, with a high near 63. Calm wind becoming west around 6 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.

    High: 63 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain. Cloudy, with a low around 54. South southwest wind 5 to 7 mph. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 54 °F

    Chance Rain

  • Sunday

    Sunday: Rain likely, mainly between 10am and 4pm, then showers likely and possibly a thunderstorm after 4pm. Mostly cloudy, with a high near 62. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 62 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before 10pm, then rain likely after 10pm. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.

    Low: 51 °F

    Showers
    Likely

  • Monday

    Monday: Rain likely, mainly before 10am. Mostly cloudy, with a high near 58.

    High: 58 °F

    Rain Likely

  • Monday Night

    Monday Night: A slight chance of rain before 10pm. Partly cloudy, with a low around 46.

    Low: 46 °F

    Slight Chance
    Rain then
    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of rain. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 52. Calm wind.
Friday
A 40 percent chance of rain, mainly after 10am. Patchy fog before 7am. Otherwise, partly sunny, with a high near 64. Calm wind becoming south southwest around 5 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A 10 percent chance of rain after 4am. Partly cloudy, with a low around 50. Calm wind.
Saturday
A 30 percent chance of rain, mainly after 10am. Mostly cloudy, with a high near 63. Calm wind becoming west around 6 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
A 50 percent chance of rain. Cloudy, with a low around 54. South southwest wind 5 to 7 mph. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Rain likely, mainly between 10am and 4pm, then showers likely and possibly a thunderstorm after 4pm. Mostly cloudy, with a high near 62. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers likely and possibly a thunderstorm before 10pm, then rain likely after 10pm. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Monday
Rain likely, mainly before 10am. Mostly cloudy, with a high near 58.
Monday Night
A slight chance of rain before 10pm. Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 60.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
A slight chance of rain. Mostly sunny, with a high near 61.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 48.
Thursday
A chance of rain. Mostly cloudy, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.72°N 122.05°W (Elev. 397 ft)
Last Update:
2:03 am PST Nov 14, 2025
Forecast Valid:
4am PST Nov 14, 2025-6pm PST Nov 20, 2025
 
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Additional Resources

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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