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

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Hazardous Weather Conditions

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Rain

52°F

11°C

Humidity 87%
Wind Speed ENE 5 MPH
Barometer 29.83 in (1010.16 mb)
Dewpoint 48°F (9°C)
Visibility 9.00 mi
Last update 01 Jan 04:35 AM PST
Extended Forecast for

2 Miles SSE Union City CA

Coastal Flood Advisory January 1, 04:51am until January 4, 02:00pm
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory January 1, 04:51am until January 4, 02:00pm

    NOW until 2:00pm Sun

    Coastal Flood Advisory

  • Overnight

    Low: 54 °F

    Showers

  • New Year's Day

    New Year's Day: Showers, with thunderstorms also possible after 10am. High near 61. South wind 9 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 61 °F

    Showers

  • Thursday Night

    Thursday Night: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 50. South southeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: Showers likely, mainly after 4pm. Mostly cloudy, with a high near 60. South southeast wind 7 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 60 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers. Low around 55. South southeast wind 16 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 55 °F

    Showers

  • Saturday

    Saturday: Showers. High near 61. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 61 °F

    Showers

  • Saturday Night

    Saturday Night: Showers, with thunderstorms also possible after 10pm. Low around 53. Chance of precipitation is 90%.

    Low: 53 °F

    Showers

  • Sunday

    Sunday: Showers. Cloudy, with a high near 58.

    High: 58 °F

    Showers

Detailed Forecast

Overnight
Showers. Steady temperature around 54. East southeast wind around 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
New Year's Day
Showers, with thunderstorms also possible after 10am. High near 61. South wind 9 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
Showers likely, mainly before 10pm. Mostly cloudy, with a low around 50. South southeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers likely, mainly after 4pm. Mostly cloudy, with a high near 60. South southeast wind 7 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Showers. Low around 55. South southeast wind 16 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Showers. High near 61. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Showers, with thunderstorms also possible after 10pm. Low around 53. Chance of precipitation is 90%.
Sunday
Showers. Cloudy, with a high near 58.
Sunday Night
Showers. Cloudy, with a low around 50.
Monday
Showers likely. Mostly cloudy, with a high near 57.
Monday Night
Showers likely. Mostly cloudy, with a low around 45.
Tuesday
A chance of showers. Partly sunny, with a high near 56.
Tuesday Night
A slight chance of showers. Patchy fog. Otherwise, mostly cloudy, with a low around 42.
Wednesday
A slight chance of showers. Patchy fog. Otherwise, partly sunny, with a high near 56.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Union City CA
 37.59°N 122.02°W (Elev. 164 ft)
Last Update:
1:25 am PST Jan 1, 2026
Forecast Valid:
4am PST Jan 1, 2026-6pm PST Jan 7, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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