Msn weather tracks it all, from. Webtoday’s and tonight’s union city, ca, united states weather forecast, weather. Webhourly local weather forecast, weather conditions, precipitation, dew point, humidity,. Webhour by hour weather updates and local hourly weather forecasts for union city,. Winds wnw at 10 to 20 mph. Webhourly local weather forecast, weather conditions, precipitation, dew point, humidity,. Webhourly weather forecast in union city, ca. Check current conditions in union city, ca. Partly cloudy, with a low around 57.