TODAY SEP19
TEMPERATURE57
HUMIDITY81
PRESSURE29.9
WIND COND.
  • 7656Wed
  • 8257Thu
  • 8056Fri
  • 7956Sat
  • 7856Sun
daynightWeather update from Hayward, Hayward Air Terminal at
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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 26% worse than the national average.

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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.
Norris Canyon, CA1,0464314%
San Lorenzo, CA24,7904314%
Blackhawk, CA9,4684314%
Danville, CA43,7584314%
San Ramon, CA74,3664314%
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.