TODAY APR17
TEMPERATURE48
HUMIDITY81
PRESSURE30.17
WIND COND.
  • 8247Sat
  • 8045Sun
  • 7443Mon
  • 6943Tue
  • 7043Wed
daynightWeather update from Chehalis-Centralia Airport at

Key findings

  • The highest monthly average temperature in Chehalis for July is 64.3 degrees
  • The lowest monthly average temperature in Chehalis for December is 38.2 degrees
  • The most monthly precipitation in Chehalis occurs in November with 9.7 inches
  • The air quality index in Chehalis is 60% better than the national average
  • The pollution index in Chehalis is 17% better than the national average

Compare Chehalis, WA Weather

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      Chehalis 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°F7.3"
      February32°F51°F41°F4.8"
      March35°F55°F44°F7.0"
      April36°F61°F48°F3.5"
      May42°F68°F55°F2.7"
      June47°F73°F59°F1.5"
      July50°F80°F64°F0.6"
      August50°F81°F64°F1.0"
      September46°F74°F59°F2.5"
      October41°F62°F51°F5.5"
      November35°F52°F44°F9.7"
      December31°F46°F38°F8.0"

      Chehalis 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.
      IndexChehalisWashingtonNational
      Air quality index203650
      Pollution index4,215,4108,596,9895,066,862

      Chehalis air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality343
      Days with moderate air quality22
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Chehalis air quality information

      PollutantTotal
      Arsenic0.005%
      Benzene0.050%
      Carbon Tetrachloride0.004%
      Lead0.030%
      Mercury0.250%

      Average monthly Chehalis temperature with heat index

      Chehalis monthly precipitation with daily maximum

      Chehalis monthly snow depth with daily maximum

      Chehalis monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Bucoda, WA5932060%
      Napavine, WA1,7592060%
      Centralia, WA16,7292060%
      Rochester, WA2,9122060%
      Oakville, WA7242060%
      Chehalis, WA7,3402060%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Franklin, LA7,3394118%
      Bermuda Dunes, CA7,3398978%
      Ville Platte, LA7,3384118%
      Keyes, CA7,338492%
      Clewiston, FL7,3433628%
      Chehalis, WA7,3402060%
      Source: The Chehalis, 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.