TODAY APR26
TEMPERATURE54
HUMIDITY80
PRESSURE101080
WIND COND.220 9.4
  • 5545Sat80%80%
  • 5539Sun70%90%
  • 5539Mon90%
  • 5739Tue
  • 6343Wed
daynightWeather update from Tacoma / McChord Air Force Base at
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Weather Quick Facts

  • The highest monthly average temperature in Fort Lewis for July is 65.6 degrees
  • The lowest monthly average temperature in Fort Lewis for December is 38.7 degrees
  • The most monthly precipitation in Fort Lewis occurs in December with 9.5 inches
  • The air quality index in Fort Lewis is 29% better than the national average
  • The pollution index in Fort Lewis is 549% worse than the national average

Compare Fort Lewis, WA Weather

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      Fort Lewis 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
      January32°F47°F39°F6.9"
      February32°F52°F41°F3.7"
      March39°F58°F47°F6.2"
      April41°F60°F49°F4.1"
      May46°F68°F56°F2.9"
      June50°F69°F59°F2.5"
      July54°F78°F66°F2.9"
      August53°F78°F64°F4.9"
      September47°F70°F58°F4.4"
      October44°F61°F51°F4.5"
      November36°F50°F42°F6.6"
      December34°F45°F39°F9.5"

      Fort Lewis 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.
      IndexFort LewisWashingtonNational
      Air quality index303642
      Pollution index17,693,8004,541,8502,726,193

      Fort Lewis air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality323
      Days with moderate air quality42
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Fort Lewis air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.300%
      Carbon Tetrachloride0.050%
      Lead0.110%
      Mercury0.020%

      Average monthly Fort Lewis temperature with heat index

      Fort Lewis monthly precipitation with daily maximum

      Fort Lewis monthly snow depth with daily maximum

      Fort Lewis monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Dash Point, WA1,0081864.0%
      Rosedale, WA4,3891864.0%
      Tacoma, WA215,7661864.0%
      Artondale, WA14,0241864.0%
      Wollochet, WA7,1931864.0%
      Fort Lewis, WA13,0453040.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Jupiter Farms, FL13,0453628.0%
      Trenton, OH13,046548.0%
      Steamboat Springs, CO13,048476.0%
      Annapolis Neck, MD13,049468.0%
      Woodinville, WA13,0384510.0%
      Fort Lewis, WA13,0453040.0%
      Source: The Fort Lewis, 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.