TODAY AUG13
TEMPERATURE62
HUMIDITY58
PRESSURE30.09
WIND COND.
  • 7154Thu
  • 7457Fri
  • 7960Sat
  • 8864Sun
  • 8261Mon
daynightWeather update from Seattle, Seattle Boeing Field at

Key findings

  • The highest monthly average temperature in Seattle for August is 68 degrees
  • The lowest monthly average temperature in Seattle for December is 41 degrees
  • The most monthly precipitation in Seattle occurs in November with 6.6 inches
  • The air quality index in Seattle is 10% better than the national average
  • The pollution index in Seattle is 79% better than the national average

Compare Seattle, WA Weather

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      Seattle 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
      January36°F49°F42°F5.1"
      February37°F52°F44°F3.8"
      March40°F55°F47°F4.9"
      April43°F61°F51°F3.1"
      May49°F68°F57°F2.2"
      June54°F72°F62°F1.5"
      July58°F79°F67°F0.4"
      August58°F79°F68°F0.6"
      September54°F73°F62°F1.6"
      October47°F62°F54°F3.9"
      November40°F53°F47°F6.6"
      December36°F48°F41°F6.1"

      Seattle 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.
      IndexSeattleWashingtonNational
      Air quality index453650
      Pollution index1,081,4308,596,9895,066,862

      Seattle 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

      Seattle air quality information

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

      Average monthly Seattle temperature with heat index

      Seattle monthly precipitation with daily maximum

      Seattle monthly snow depth with daily maximum

      Seattle monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Bethel, WA3,7641864%
      Enetai, WA2,2341864%
      Keyport, WA4421864%
      Lofall, WA2,2571864%
      Poulsbo, WA9,8061864%
      Seattle, WA668,8494510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Denver, CO663,3035816%
      El Paso, TX678,058536%
      Washington, DC659,009476%
      Boston, MA658,2794314%
      Memphis, TN655,8574510%
      Seattle, WA668,8494510%
      Source: The Seattle, 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.