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

Fire Weather Concerns and Severe Thunderstorms through the Weekend

Dry and windy conditions, and some dry thunderstorms and lightning, may support hazardous fire activity in the northern Plains, high southern Plains and the Southwest this weekend. An active severe weather pattern is forecast for portions of the central and southern High Plains into the Upper Midwest through early the part of next week. Damaging winds, large hail, and tornadoes are possible. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

68°F

20°C

Humidity 54%
Wind Speed W 11 MPH
Barometer 30.02 in (1016.59 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 15 May 11:54 AM PDT
Extended Forecast for

Castro Valley CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 77. West wind around 9 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 52. Southwest wind 6 to 8 mph.

    Low: 52 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 73. West wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 73 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 50. West wind 5 to 10 mph becoming light west southwest after midnight. Winds could gust as high as 20 mph.

    Low: 50 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 77. Light west wind becoming northwest 9 to 14 mph in the afternoon. Winds could gust as high as 23 mph.

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 58.

    Low: 58 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 53.

    Low: 53 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 77. West wind around 9 mph.
Tonight
Clear, with a low around 52. Southwest wind 6 to 8 mph.
Saturday
Sunny, with a high near 73. West wind 6 to 11 mph, with gusts as high as 21 mph.
Saturday Night
Mostly clear, with a low around 50. West wind 5 to 10 mph becoming light west southwest after midnight. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 77. Light west wind becoming northwest 9 to 14 mph in the afternoon. Winds could gust as high as 23 mph.
Sunday Night
Clear, with a low around 58.
Monday
Sunny, with a high near 84.
Monday Night
Clear, with a low around 53.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Mostly clear, with a low around 55.
Wednesday
Sunny, with a high near 86.
Wednesday Night
Mostly clear, with a low around 55.
Thursday
Sunny, with a high near 82.
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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:
11:27 am PDT May 15, 2026
Forecast Valid:
12pm PDT May 15, 2026-6pm PDT May 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation