TODAY MAR29
TEMPERATURE46
HUMIDITY68
PRESSURE100920
WIND COND.200 14.8
  • 5640Fri30%
  • 5840Sat
  • 5941Sun
  • 6345Mon
  • 6345Tue
daynightWeather update from Seattle, Seattle-Tacoma International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in SeaTac for August is 66.5 degrees
  • The lowest monthly average temperature in SeaTac for December is 40.6 degrees
  • The most monthly precipitation in SeaTac occurs in November with 7.1 inches
  • The air quality index in SeaTac is 7% worse than the national average
  • The pollution index in SeaTac is 60% better than the national average

Compare SeaTac, WA Weather

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      SeaTac 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
      January35°F48°F42°F5.6"
      February37°F51°F43°F3.7"
      March39°F55°F46°F5.1"
      April42°F60°F50°F3.2"
      May47°F68°F56°F2.2"
      June52°F72°F61°F1.5"
      July56°F80°F66°F0.6"
      August56°F80°F66°F1.1"
      September53°F73°F61°F1.9"
      October46°F62°F53°F4.5"
      November40°F53°F46°F7.1"
      December35°F47°F41°F6.1"

      SeaTac 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.
      IndexSeaTacWashingtonNational
      Air quality index453642
      Pollution index1,081,4304,541,8502,726,193

      SeaTac air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality236
      Days with moderate air quality127
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      SeaTac air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.010%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly SeaTac temperature with heat index

      SeaTac monthly precipitation with daily maximum

      SeaTac monthly snow depth with daily maximum

      SeaTac monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Manchester, WA6,0501864.0%
      Ruston, WA1,3291864.0%
      Browns Point, WA9611864.0%
      Gig Harbor, WA10,2801864.0%
      Parkwood, WA6,7581864.0%
      SeaTac, WA29,1024510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Fuquay-Varina, NC29,110468.0%
      Oak Ridge, TN29,124536.0%
      Southgate, MI29,1295612.0%
      Rexburg, ID29,0644314.0%
      Fredericksburg, VA29,059476.0%
      SeaTac, WA29,1024510.0%
      Source: The SeaTac, 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.