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

Hazardous Weather Conditions

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

81°F

27°C

Humidity 44%
Wind Speed W 10 MPH
Barometer 29.8 in (1009.14 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 08 Oct 02:35 PM PDT
Extended Forecast for

Castro Valley CA

Coastal Flood Advisory October 9, 09:00am until October 13, 03:00pm
Heat Advisory October 8, 03:00pm until October 8, 10:00pm
Click here for hazard details and duration
Coastal Flood Advisory
...
  •  
    Heat Advisory October 8, 03:00pm until October 8, 10:00pm

    NOW until 10:00pm Thu

    Heat Advisory

  • Tonight

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 78. Calm wind becoming west 5 to 9 mph in the afternoon.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 57. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 57 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 64. Southwest wind 11 to 13 mph, with gusts as high as 21 mph.

    High: 64 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 52. Southwest wind 11 to 15 mph, with gusts as high as 25 mph.

    Low: 52 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: A slight chance of showers after 11am. Mostly sunny, with a high near 68.

    High: 68 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 60. West wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 78. Calm wind becoming west 5 to 9 mph in the afternoon.
Friday Night
Increasing clouds, with a low around 57. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 64. Southwest wind 11 to 13 mph, with gusts as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 52. Southwest wind 11 to 15 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 52.
Columbus Day
A slight chance of showers after 11am. Mostly sunny, with a high near 68.
Monday Night
Partly cloudy, with a low around 53.
Tuesday
Sunny, with a high near 69.
Tuesday Night
Patchy fog. Otherwise, mostly clear, with a low around 53.
Wednesday
Patchy fog. Otherwise, sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 55.
Thursday
Sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.71°N 122.08°W (Elev. 397 ft)
Last Update:
1:41 pm PDT Oct 8, 2026
Forecast Valid:
3pm PDT Oct 8, 2026-6pm PDT Oct 15, 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