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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Mostly Cloudy

63°F

17°C

Humidity 82%
Wind Speed W 9 MPH
Barometer 30.02 in (1016.59 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 18 Aug 12:05 AM PDT
Extended Forecast for

3 Miles NW Union City CA

  • Overnight

    Overnight: Mostly cloudy, with a low around 58. West wind around 7 mph.

    Low: 58 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy through mid morning, then gradual clearing, with a high near 72. West wind 5 to 10 mph.

    High: 72 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 57. West wind 6 to 11 mph becoming light southwest after midnight. Winds could gust as high as 18 mph.

    Low: 57 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny, with a high near 72. Light southwest wind becoming west 5 to 9 mph in the afternoon.

    High: 72 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58. West wind 6 to 11 mph becoming light southwest after midnight.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 58. West wind around 7 mph.
Monday
Mostly cloudy through mid morning, then gradual clearing, with a high near 72. West wind 5 to 10 mph.
Monday Night
Increasing clouds, with a low around 57. West wind 6 to 11 mph becoming light southwest after midnight. Winds could gust as high as 18 mph.
Tuesday
Partly sunny, then gradually becoming sunny, with a high near 72. Light southwest wind becoming west 5 to 9 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 58. West wind 6 to 11 mph becoming light southwest after midnight.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 59.
Saturday
Mostly sunny, with a high near 78.
Saturday Night
Partly cloudy, with a low around 58.
Sunday
Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Union City CA
 37.63°N 122.06°W (Elev. 187 ft)
Last Update:
1:26 pm PDT Aug 17, 2025
Forecast Valid:
12am 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