Areas of Excessive Rainfall and Severe Thunderstorms; Fire Weather Concerns in the Northern Plains and Four Corners Region

Widespread showers and thunderstorms may bring areas of flash flooding across much of the Southern Plains into the Gulf Coast region and the upper Ohio River Valley into the Mid-Atlantic. A large Pacific storm will bring widespread rain, gusty winds, and mountain snow to California and the Great Basin. Fire weather concerns expected in the Northern Plains and the Four Corners region. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Mostly Cloudy

54°F

12°C

Humidity 80%
Wind Speed S 5 MPH
Barometer 29.75 in (1007.45 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 27 May 04:38 AM PDT
Extended Forecast for

Union City CA

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 66. South wind 5 to 10 mph becoming west in the afternoon.

    High: 66 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: A 30 percent chance of rain, mainly between 10pm and 11pm.  Mostly cloudy, with a low around 51. West wind 5 to 9 mph becoming light and variable  in the evening.

    Low: 51 °F

    Chance Rain
    then Mostly
    Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain.  Cloudy, then gradually becoming mostly sunny, with a high near 67. South southeast wind 5 to 7 mph becoming west southwest in the afternoon.  New precipitation amounts of less than a tenth of an inch possible.

    High: 67 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 52. West northwest wind 6 to 11 mph becoming light west southwest  after midnight. Winds could gust as high as 20 mph.

    Low: 52 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 64. Light southwest wind becoming west 6 to 11 mph in the morning. Winds could gust as high as 20 mph.

    High: 64 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 66. South wind 5 to 10 mph becoming west in the afternoon.
Tonight
A 30 percent chance of rain, mainly between 10pm and 11pm. Mostly cloudy, with a low around 51. West wind 5 to 9 mph becoming light and variable in the evening.
Thursday
A 20 percent chance of rain. Cloudy, then gradually becoming mostly sunny, with a high near 67. South southeast wind 5 to 7 mph becoming west southwest in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Partly cloudy, with a low around 52. West northwest wind 6 to 11 mph becoming light west southwest after midnight. Winds could gust as high as 20 mph.
Friday
Mostly sunny, with a high near 64. Light southwest wind becoming west 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
Mostly clear, with a low around 48.
Sunday
Sunny, with a high near 71.
Sunday Night
Mostly clear, with a low around 51.
Monday
Sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Sunny, with a high near 76.
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ABOUT THIS FORECAST

 
Point Forecast:
Union City CA
 37.61°N 122°W (Elev. 594 ft)
2:36 am PDT May 27, 2026
4am PDT May 27, 2026-6pm PDT Jun 2, 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