TODAY APR23
TEMPERATURE58
HUMIDITY47
PRESSURE101420
WIND COND.
  • 5946Wed40%40%
  • 5248Thu90%90%
  • 5445Fri90%
  • 5545Sat
  • 5341Sun
daynightWeather update from Shelton, Shelton Sanderson Field at
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Weather Quick Facts

  • The highest monthly average temperature in Union for August is 63.6 degrees
  • The lowest monthly average temperature in Union for December is 37.8 degrees
  • The most monthly precipitation in Union occurs in November with 13.6 inches
  • The air quality index in Union is 50% better than the national average
  • The pollution index in Union is 5% worse than the national average

Compare Union, WA Weather

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      Union 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
      January33°F46°F39°F10.0"
      February33°F50°F41°F6.7"
      March36°F54°F44°F9.7"
      April37°F60°F47°F4.7"
      May43°F67°F54°F3.1"
      June48°F72°F58°F1.6"
      July51°F79°F63°F0.8"
      August51°F80°F64°F1.1"
      September47°F74°F59°F3.0"
      October42°F61°F50°F7.4"
      November36°F51°F43°F13.6"
      December32°F45°F38°F11.5"

      Union 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.
      IndexUnionWashingtonNational
      Air quality index213642
      Pollution index2,873,3904,541,8502,726,193

      Union air quality information

      MeasurementTotal
      Days measured361
      Days with good air quality339
      Days with moderate air quality22
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Union air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.050%
      Carbon Tetrachloride0.010%
      Lead0.010%
      Mercury0.010%

      Average monthly Union temperature with heat index

      Union monthly precipitation with daily maximum

      Union monthly snow depth with daily maximum

      Union monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Grapeview, WA7031864.0%
      Allyn, WA2,5041864.0%
      Belfair, WA4,5571864.0%
      Vaughn, WA1,0521864.0%
      Hoodsport, WA1392158.0%
      Union, WA3272158.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      King Salmon, AK3273138.0%
      Fulton, AL3273628.0%
      Mentone, AL3273922.0%
      Chauncey, GA3272648.0%
      Irwin, IA3274020.0%
      Union, WA3272158.0%
      Source: The Union, WA 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.