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

Heat Wave Continues in the West; Critical Fire Weather Conditions in the High Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. Read More >

Hazardous Weather Conditions

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Clear

75°F

24°C

Humidity 53%
Wind Speed WSW 6 MPH
Barometer 30.05 in (1017.61 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 18 Mar 12:35 PM PDT
Extended Forecast for

Union City CA

Heat Advisory March 18, 01:00pm until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 18, 01:00pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • This Afternoon

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 65. North northwest wind around 6 mph becoming calm in the evening.

    Low: 65 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 89. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 89 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 63. Northwest wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 89. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 88. West northwest wind 3 to 6 mph.
Tonight
Clear, with a low around 65. North northwest wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 89. Calm wind becoming northwest around 6 mph in the afternoon.
Thursday Night
Clear, with a low around 63. Northwest wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 89. Calm wind becoming northwest around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 61.
Saturday
Mostly sunny, with a high near 79.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
Sunny, with a high near 75.
Sunday Night
Mostly clear, with a low around 52.
Monday
Mostly sunny, with a high near 74.
Monday Night
Mostly cloudy, with a low around 54.
Tuesday
Mostly sunny, with a high near 74.
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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:
12:41 pm PDT Mar 18, 2026
Forecast Valid:
1pm PDT Mar 18, 2026-6pm PDT Mar 24, 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