Our Proprietary 10-Day Forecast

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Current warnings over Union City, California
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over Union City, California red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over Union City, California red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Alameda County, CA

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near Union City, California

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in Union City, CA please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over Union City, CA

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in Union City, CA, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near Union City, California

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Alameda County, California

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
Get access to:
  • European ECMWF HRES
  • American GFS
  • Canadian GDPS GEM
  • German DWD ICON
  • British MetOffice's UKMET Unified Model
  • American NAM
  • American HRRR
  • American NBM - National Blend of Models
  • GEFS, GEPS, MOGREPS & European Ensembles
  • Probabilities & Averages
  • 3-Ensemble Mean & more!
View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
See the latest forecast data as the models update.
 
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Climate Summary
(made with AI, use with caution)
Union City, California Climate Summary

Temperature

    •   Average annual temperature: 58.1°F (14.5°C)
    •   Average summer temperature (June-August): 71.6°F (22°C)
    •   Average winter temperature (December-February): 44.6°F (7°C)
    •   Record high temperature: 114°F (45.6°C)
    •   Record low temperature: 19°F (-7.2°C)

Precipitation

    •   Average annual precipitation: 16.2 inches (41.1 centimeters)
    •   Average number of rainy days per year: 59
    •   Heaviest month for precipitation: January (3.1 inches)
    •   Driest month for precipitation: July (0.0 inches)

Snowfall

    •   Average annual snowfall: 0.1 inches (0.3 centimeters)
    •   Heaviest month for snowfall: December (0.1 inches)

Wind

    •   Average wind speed: 8.1 mph (13 km/h)
    •   Prevailing wind direction: West-southwest

Humidity

    •   Average annual relative humidity: 71%
    •   Highest monthly relative humidity: January (78%)
    •   Lowest monthly relative humidity: July (61%)

Climate Type

    •   Mediterranean climate

Additional Information

    •   Union City, California is located in the San Francisco Bay Area, which is known for its mild climate.
    •   The city experiences warm, dry summers and cool, wet winters.
    •   The city is also known for its fog, which can be thick at times.
    •   Union City is a great place to live for people who enjoy outdoor activities, as the city has many parks and trails.
    •   The city is also home to a number of cultural attractions, including the Union City Civic Center and the Union City Library.

Facts & Historical Information
(made with AI, use with caution)
Natural History

    •   Union City is home to the Union City Salt Marsh, a 1,500-acre tidal wetland that provides habitat for numerous bird species, including the endangered California clapper rail.

    •   The city's namesake, Union Creek, was once a major salmon spawning ground.

Science

    •   Union City is the birthplace of the Lawrence Livermore National Laboratory (LLNL), a world-renowned research facility focused on nuclear energy and national security.

    •   LLNL has made significant contributions to fields such as astrophysics, laser technology, and medical imaging.

Personalities

  • John Muir:

    The renowned naturalist and conservationist lived in Union City for a period during his youth.

  • Ernest Lawrence:

    The Nobel Prize-winning physicist who founded LLNL was born in Union City.

  • John Madden:

    The legendary football coach and broadcaster grew up in Union City.

    • Tourist Attractions
    1.Union City Sports Center

    This state-of-the-art sports complex offers a wide range of indoor and outdoor activities, including swimming, basketball, tennis, and fitness classes.

    2.Bay Trail

    This scenic trail runs along the eastern shore of San Francisco Bay, offering stunning views of the water and the surrounding hills. It's a popular spot for walking, biking, and rollerblading.

    3.Coyote Hills Regional Park

    This 1,267-acre park features rolling hills, a lake, and a variety of trails. It's a great place to go for a hike, bike ride, or picnic.

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