TODAY JUN05
TEMPERATURE62
HUMIDITY67
PRESSURE29.75
WIND COND.300 4.7
  • 7055Fri
  • 6852Sat
  • 6651Sun
  • 7352Mon
  • 7957Tue
daynightWeather update from Hayward, Hayward Air Terminal at
How would you rate the weather in Union City?
Write a review to give others more information about this area.
How would you rate the air quality in Union City?
Write a review to give others more information about this area.
See all Union City poll results

Union City Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January42°F58°F50°F3.5"
February46°F61°F53°F3.3"
March46°F64°F54°F2.6"
April48°F66°F56°F1.8"
May52°F69°F59°F0.6"
June56°F73°F62°F0.1"
July57°F75°F64°F0.0"
August58°F76°F64°F0.0"
September57°F76°F64°F0.2"
October53°F72°F61°F1.4"
November48°F66°F56°F1.3"
December42°F58°F49°F3.2"

Did you know?

  • The highest monthly average temperature in Union City for August is 64 degrees.
  • The lowest monthly average temperature in Union City for December is 49 degrees.
  • The most monthly precipitation in Union City occurs in January with 3.5 inches.
  • The air quality index in Union City is 3% better than the national average.
  • The pollution index in Union City is 27% worse than the national average.

Compare Union City, CA Weather To Other Cities

      vs

      Union City air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexUnion CityCaliforniaNational
      Air quality index485550
      Pollution index6,427,29018,106,7265,066,862

      Union City air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality204
      Days with moderate air quality153
      Days w/ poor A.Q. for sensitive groups7
      Days with unhealthy air quality1

      Union City air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.110%
      Carbon Tetrachloride0.010%
      Lead0.010%
      Mercury0.003%

      Average monthly Union City temperature with heat index

      Union City monthly precipitation with daily maximum

      Union City monthly snow depth with daily maximum

      Union City monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      San Lorenzo, CA24,7904314%
      Norris Canyon, CA1,0464314%
      San Ramon, CA74,3664314%
      Blackhawk, CA9,4684314%
      Danville, CA43,7584314%
      Union City, CA73,500484%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Milpitas, CA73,447484%
      Appleton, WI73,4463824%
      Manteca, CA73,5705714%
      Dale City, VA73,384492%
      Loveland, CO73,360468%
      Union City, CA73,500484%
      Source: The Union City, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.