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

Heavy Rain and Flooding Concerns in Hawaii; Severe Weather in the Plains

A storm system is expected to bring strong winds, widespread heavy rainfall, and flooding concerns to the Hawaiian Islands through the weekend. Strong to severe thunderstorms are forecast from the Southern Plains to the Mid-Missouri Valley Thursday afternoon and evening. Large hail and strong winds are the primary threats. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Overcast

57°F

14°C

Humidity 87%
Wind Speed NW 6 MPH
Barometer 30.0 in (1015.92 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 08 Apr 11:35 PM PDT
Extended Forecast for

Union City CA

  • Tonight

    Tonight: Mostly cloudy, with a low around 55. West wind around 6 mph becoming calm after midnight.

    Low: 55 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 68. Light southwest wind becoming west 5 to 10 mph in the afternoon.

    High: 68 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A slight chance of rain, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 55. West wind 5 to 9 mph becoming light after midnight. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Slight Chance
    Rain then
    Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 64. Light south southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 11pm, then rain likely after 11pm. Mostly cloudy, with a low around 54. South wind 7 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Showers
    Likely

  • Saturday

    Saturday: Rain, mainly before 2pm, then showers and possibly a thunderstorm after 2pm. High near 58. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 58 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 2am, then rain after 2am. Low around 48. Chance of precipitation is 90%.

    Low: 48 °F

    Showers

  • Sunday

    Sunday: Rain before 11am, then showers likely and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 56.

    High: 56 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of rain before 11pm. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance Rain
    then Mostly
    Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 55. West wind around 6 mph becoming calm after midnight.
Thursday
Partly sunny, with a high near 68. Light southwest wind becoming west 5 to 10 mph in the afternoon.
Thursday Night
A slight chance of rain, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 55. West wind 5 to 9 mph becoming light after midnight. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers and possibly a thunderstorm. High near 64. Light south southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers likely and possibly a thunderstorm before 11pm, then rain likely after 11pm. Mostly cloudy, with a low around 54. South wind 7 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Rain, mainly before 2pm, then showers and possibly a thunderstorm after 2pm. High near 58. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm before 2am, then rain after 2am. Low around 48. Chance of precipitation is 90%.
Sunday
Rain before 11am, then showers likely and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 56.
Sunday Night
A chance of rain before 11pm. Mostly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 59.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Mostly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 48.
Wednesday
Mostly sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Union City CA
 37.61°N 122°W (Elev. 594 ft)
Last Update:
11:26 pm PDT Apr 8, 2026
Forecast Valid:
11pm PDT Apr 8, 2026-6pm PDT Apr 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