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

Heavy Rain and Flooding Concerns in Hawaii; Severe Weather this Weekend in the Plains; Pacific Storm in the West

A storm system near the Hawaiian Islands is expected to bring periods of heavy rainfall, strong winds, and isolated strong to severe thunderstorms through Friday. Several rounds of severe thunderstorms are forecast to impact parts of the Great Plains into the Midwest this weekend into next week. Moderate to heavy rainfall and high elevation snow is expected this weekend over California and Oregon. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

63°F

17°C

Humidity 72%
Wind Speed WNW 13 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 09 Apr 06:30 PM PDT
Extended Forecast for

Union City CA

  • Tonight

    Tonight: A 30 percent chance of showers after 4am. Mostly cloudy, with a low around 55. West wind 5 to 10 mph becoming light after midnight. New precipitation amounts of less than a tenth of an inch possible.

    Low: 55 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. High near 64. South southwest wind 5 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. 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. Mostly cloudy, with a low around 54. Southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 2pm. High near 60. South southwest wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 60 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 48. South southwest wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 48 °F

    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 11am. High near 55. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 55 °F

    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of rain, mainly before 11pm. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance Rain

  • Monday

    Monday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers after 4am. Mostly cloudy, with a low around 55. West wind 5 to 10 mph becoming light after midnight. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. High near 64. South southwest wind 5 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. 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. Mostly cloudy, with a low around 54. Southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers, with thunderstorms also possible after 2pm. High near 60. South southwest wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm. Low around 48. South southwest wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
Showers, with thunderstorms also possible after 11am. High near 55. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 40 percent chance of rain, mainly before 11pm. Mostly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 60.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Mostly sunny, with a high near 63.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Mostly sunny, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Mostly sunny, with a high near 67.
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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:
4:46 pm PDT Apr 9, 2026
Forecast Valid:
6pm PDT Apr 9, 2026-6pm PDT Apr 16, 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