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Tracking Major Hurricane Erin; Hot in the Mid-Mississippi Valley

Major Hurricane Erin is tracking just north of the lower Bahamas today. Dangerous surf and rip current threats increase this week for most of the Atlantic coastline. Erin's outerbands may impact the Outer Banks later this week. Hot to extremely hot temperatures are forecast today and Tuesday from a part of the southern Plains into the central to lower Mississippi River Valley. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

64°F

18°C

Humidity 72%
Wind Speed S 4 MPH
Barometer 30.06 in (1017.95 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 18 Aug 09:30 AM PDT
Extended Forecast for

Union City CA

  • Today

    Today: Sunny, with a high near 74. Light west wind becoming west northwest 6 to 11 mph in the morning. Winds could gust as high as 20 mph.

    High: 74 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 56. West northwest wind 5 to 9 mph becoming calm after midnight.

    Low: 56 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny, with a high near 73. Light west southwest wind becoming west 5 to 10 mph in the afternoon.

    High: 73 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 56. West wind 6 to 11 mph becoming light southwest after midnight. Winds could gust as high as 18 mph.

    Low: 56 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Sunny, with a high near 81. Calm wind becoming west 5 to 9 mph in the afternoon.

    High: 81 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 74. Light west wind becoming west northwest 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Tonight
Increasing clouds, with a low around 56. West northwest wind 5 to 9 mph becoming calm after midnight.
Tuesday
Partly sunny, then gradually becoming sunny, with a high near 73. Light west southwest wind becoming west 5 to 10 mph in the afternoon.
Tuesday Night
Increasing clouds, with a low around 56. West wind 6 to 11 mph becoming light southwest after midnight. Winds could gust as high as 18 mph.
Wednesday
Sunny, with a high near 81. Calm wind becoming west 5 to 9 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 87.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 59.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 59.
Sunday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Union City CA
 37.61°N 122.02°W (Elev. 184 ft)
Last Update:
8:18 am PDT Aug 18, 2025
Forecast Valid:
9am PDT Aug 18, 2025-6pm PDT Aug 24, 2025
 
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